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MAX232CWE Multichannel RS-232 Drivers/Receivers

Published:2011/5/25 13:36:00 |

General Description
The MAX220MAX249 family of line drivers/receivers is
intended for all EIA/TIA-232E and V.28/V.24 communications
interfaces, particularly applications where ±12V is
not available.
These parts are especially useful in battery-powered systems,
since their low-power shutdown mode reduces
power dissipation to less than 5μW. The MAX225,
MAX233, MAX235, and MAX245/MAX246/MAX247 use
no external components and are recommended for applications
where printed circuit board space is critical.
________________________Applications
Portable Computers
Low-Power Modems
Interface Translation
Battery-Powered RS-232 Systems
Multidrop RS-232 Networks
____________________________Features
Superior to Bipolar
 Operate from Single +5V Power Supply
(+5V and +12V—MAX231/MAX239)
 Low-Power Receive Mode in Shutdown
(MAX223/MAX242)
 Meet All EIA/TIA-232E and V.28 Specifications
 Multiple Drivers and Receivers
 3-State Driver and Receiver Outputs
 Open-Line Detection (MAX243)
Ordering Information
Ordering Information continued at end of data sheet.
*Contact factory for dice specifications.
MAX220MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
________________________________________________________________ Maxim Integrated Products 1
Selection Table
19-4323; Rev 9; 4/00
PART
MAX220CPE
MAX220CSE
MAX220CWE 0°C to +70°C
0°C to +70°C
0°C to +70°C
TEMP. RANGE PIN-PACKAGE
16 Plastic DIP
16 Narrow SO
16 Wide SO
MAX220C/D 0°C to +70°C Dice*
MAX220EPE
MAX220ESE
MAX220EWE -40°C to +85°C
-40°C to +85°C
-40°C to +85°C 16 Plastic DIP
16 Narrow SO
16 Wide SO
MAX220EJE -40°C to +85°C 16 CERDIP
MAX220MJE -55°C to +125°C 16 CERDIP
Power No. of Nominal SHDN Rx
Part Supply RS-232 No. of Cap. Value & Three- Active in Data Rate
Number (V) Drivers/Rx Ext. Caps (μF) State SHDN (kbps) Features
MAX220 +5 2/2 4 4.7/10 No — 120 Ultra-low-power, industry-standard pinout
MAX222 +5 2/2 4 0.1 Yes — 200 Low-power shutdown
MAX223 (MAX213) +5 4/5 4 1.0 (0.1) Yes ✔ 120 MAX241 and receivers active in shutdown
MAX225 +5 5/5 0 — Yes ✔ 120 Available in SO
MAX230 (MAX200) +5 5/0 4 1.0 (0.1) Yes — 120 5 drivers with shutdown
MAX231 (MAX201) +5 and 2/2 2 1.0 (0.1) No — 120 Standard +5/+12V or battery supplies;
+7.5 to +13.2 same functions as MAX232
MAX232 (MAX202) +5 2/2 4 1.0 (0.1) No — 120 (64) Industry standard
MAX232A +5 2/2 4 0.1 No — 200 Higher slew rate, small caps
MAX233 (MAX203) +5 2/2 0 — No — 120 No external caps
MAX233A +5 2/2 0 — No — 200 No external caps, high slew rate
MAX234 (MAX204) +5 4/0 4 1.0 (0.1) No — 120 Replaces 1488
MAX235 (MAX205) +5 5/5 0 — Yes — 120 No external caps
MAX236 (MAX206) +5 4/3 4 1.0 (0.1) Yes — 120 Shutdown, three state
MAX237 (MAX207) +5 5/3 4 1.0 (0.1) No — 120 Complements IBM PC serial port
MAX238 (MAX208) +5 4/4 4 1.0 (0.1) No — 120 Replaces 1488 and 1489
MAX239 (MAX209) +5 and 3/5 2 1.0 (0.1) No — 120 Standard +5/+12V or battery supplies;
+7.5 to +13.2 single-package solution for IBM PC serial port
MAX240 +5 5/5 4 1.0 Yes — 120 DIP or flatpack package
MAX241 (MAX211) +5 4/5 4 1.0 (0.1) Yes — 120 Complete IBM PC serial port
MAX242 +5 2/2 4 0.1 Yes ✔ 200 Separate shutdown and enable
MAX243 +5 2/2 4 0.1 No — 200 Open-line detection simplifies cabling
MAX244 +5 8/10 4 1.0 No — 120 High slew rate
MAX245 +5 8/10 0 — Yes ✔ 120 High slew rate, int. caps, two shutdown modes
MAX246 +5 8/10 0 — Yes ✔ 120 High slew rate, int. caps, three shutdown modes
MAX247 +5 8/9 0 — Yes ✔ 120 High slew rate, int. caps, nine operating modes
MAX248 +5 8/8 4 1.0 Yes ✔ 120 High slew rate, selective half-chip enables
MAX249 +5 6/10 4 1.0 Yes ✔ 120 Available in quad flatpack package
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
MAX220MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS—MAX220/222/232A/233A/242/243
ELECTRICAL CHARACTERISTICS—MAX220/222/232A/233A/242/243
(VCC = +5V ±10%, C1–C4 = 0.1μF‚ MAX220, C1 = 0.047μF, C2–C4 = 0.33μF, TA = TMIN to TMAX‚ unless otherwise noted.)
Note 1: Input voltage measured with TOUT in high-impedance state, SHDN or VCC = 0V.
Note 2: For the MAX220, V+ and V- can have a maximum magnitude of 7V, but their absolute difference cannot exceed 13V.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Supply Voltage (VCC) ...............................................-0.3V to +6V
Input Voltages
TIN..............................................................-0.3V to (VCC - 0.3V)
RIN (Except MAX220) ........................................................±30V
RIN (MAX220).....................................................................±25V
TOUT (Except MAX220) (Note 1) .......................................±15V
TOUT (MAX220)...............................................................±13.2V
Output Voltages
TOUT...................................................................................±15V
ROUT.........................................................-0.3V to (VCC + 0.3V)
Driver/Receiver Output Short Circuited to GND.........Continuous
Continuous Power Dissipation (TA = +70°C)
16-Pin Plastic DIP (derate 10.53mW/°C above +70°C)....842mW
18-Pin Plastic DIP (derate 11.11mW/°C above +70°C)....889mW
20-Pin Plastic DIP (derate 8.00mW/°C above +70°C) ..440mW
16-Pin Narrow SO (derate 8.70mW/°C above +70°C) ...696mW
16-Pin Wide SO (derate 9.52mW/°C above +70°C)......762mW
18-Pin Wide SO (derate 9.52mW/°C above +70°C)......762mW
20-Pin Wide SO (derate 10.00mW/°C above +70°C)....800mW
20-Pin SSOP (derate 8.00mW/°C above +70°C) ..........640mW
16-Pin CERDIP (derate 10.00mW/°C above +70°C).....800mW
18-Pin CERDIP (derate 10.53mW/°C above +70°C).....842mW
Operating Temperature Ranges
MAX2_ _AC_ _, MAX2_ _C_ _.............................0°C to +70°C
MAX2_ _AE_ _, MAX2_ _E_ _ ..........................-40°C to +85°C
MAX2_ _AM_ _, MAX2_ _M_ _.......................-55°C to +125°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
Input Logic Threshold Low 1.4 0.8 V
PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Logic Threshold High
All except MAX220 2 1.4
V
All except MAX220, normal operation 5 40
Logic Pull-Up/lnput Current
SHDN = 0V, MAX222/242, shutdown, MAX220 ±0.01 ±1
μA
VCC = 5.5V, SHDN = 0V, VOUT = ±15V, MAX222/242 ±0.01 ±10
Output Leakage Current
VCC = SHDN = 0V, VOUT = ±15V ±0.01 ±10
μA
Data Rate All except MAX220, normal operation 200 116 kb/s
Transmitter Output Resistance VCC = V+ = V- = 0V, VOUT = ±2V 300 10M Ω
Output Short-Circuit Current VOUT = 0V ±7 ±22 mA
RS-232 Input Voltage Operating Range ±30 V
All except MAX243 R2IN 0.8 1.3
RS-232 Input Threshold Low VCC = 5V
MAX243 R2IN (Note 2) -3
V
All except MAX243 R2IN 1.8 2.4
RS-232 Input Threshold High VCC = 5V
MAX243 R2IN (Note 2) -0.5 -0.1
V
All except MAX243, VCC = 5V, no hysteresis in shdn. 0.2 0.5 1
RS-232 Input Hysteresis
MAX243 1
V
RS-232 Input Resistance 3 5 7 kΩ
TTL/CMOS Output Voltage Low IOUT = 3.2mA 0.2 0.4 V
TTL/CMOS Output Voltage High IOUT = -1.0mA 3.5 VCC - 0.2 V
Sourcing VOUT = GND -2 -10
TTL/CMOS Output Short-Circuit Current mA
Shrinking VOUT = VCC 10 30
Output Voltage Swing All transmitter outputs loaded with 3kΩ to GND ±5 ±8 V
RS-232 TRANSMITTERS
RS-232 RECEIVERS
MAX220: VCC = 5.0V 2.4
MAX220MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
_______________________________________________________________________________________ 3
Note 3: MAX243 R2OUT is guaranteed to be low when R2IN is ≥ 0V or is floating.
ELECTRICAL CHARACTERISTICS—MAX220/222/232A/233A/242/243 (continued)
(VCC = +5V ±10%, C1–C4 = 0.1μF‚ MAX220, C1 = 0.047μF, C2–C4 = 0.33μF, TA = TMIN to TMAX‚ unless otherwise noted.)
Operating Supply Voltage
SHDN Threshold High
4.5 5.5 V
MAX222/242
Transmitter-Output Enable Time
(SHDN goes high), Figure 4
2.0 1.4 V
MAX220 0.5 2
tET
No load
MAX222/232A/233A/242/243 4 10
MAX222/232A/233A/242/243 6 12 30
MAX220 12
VCC Supply Current (SHDN = VCC),
Figures 5, 6, 11, 19 3kΩ load
both inputs MAX222/232A/233A/242/243 15
mA
Transition Slew Rate
TA = +25°C 0.1 10
CL = 50pF to 2500pF,
RL = 3kΩ to 7kΩ,
VCC = 5V, TA = +25°C,
measured from +3V
to -3V or -3V to +3V
TA = 0°C to +70°C
CONDITIONS
2 50
MAX220 1.5 3 30
V/μs
TA = -40°C to +85°C 2 50
MAX222/242, 0.1μF caps
(includes charge-pump start-up)
Shutdown Supply Current MAX222/242
TA = -55°C to +125°C 35 100
μA
SHDN Input Leakage Current MAX222/242 ±1 μA
SHDN Threshold Low MAX222/242 1.4 0.8 V
250
MAX222/232A/233A/242/243 1.3 3.5
μs
tPHLT MAX220 4 10
Transmitter-Output Disable Time
(SHDN goes low), Figure 4
tDT
MAX222/232A/233A/242/243 1.5 3.5
Transmitter Propagation Delay
TLL to RS-232 (normal operation),
Figure 1 tPLHT MAX220 5 10
μs
2.0 1.4 V
MAX222/242, 0.1μF caps
±0.05 ±10 μA
600
TTL/CMOS Output Leakage Current
EN Input Threshold High
MAX222/232A/233A/242/243 0.5 1
ns
tPHLR MAX220 0.6 3
tPLHR
MAX222/232A/233A/242/243 0.6 1
Receiver Propagation Delay
RS-232 to TLL (normal operation),
Figure 2
tPHLT - tPLHT
MAX220 0.8 3
μs
MAX222/232A/233A/242/243
Receiver Propagation Delay tPHLS MAX242 0.5 10
RS-232 to TLL (shutdown), Figure 2 tPLHS MAX242 2.5 10
μs
Receiver-Output Enable Time, Figure 3 tER MAX242
MIN TYP MAX UNITS
125 500
PARAMETER
MAX242
ns
SHDN = VCC or EN = VCC (SHDN = 0V for MAX222),
0V ≤ VOUT ≤ VCC
Receiver-Output Disable Time, Figure 3 tDR MAX242 160 500 ns
300
ns
Transmitter + to - Propagation
Delay Difference (normal operation) MAX220 2000
tPHLR - tPLHR
MAX222/232A/233A/242/243 100
ns
Receiver + to - Propagation
Delay Difference (normal operation) MAX220 225
EN Input Threshold Low MAX242 1.4 0.8 V
MAX220MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
4 _______________________________________________________________________________________
__________________________________________Typical Operating Characteristics
MAX220/MAX222/MAX232A/MAX233A/MAX242/MAX243
10
8
-10
0 5 15 25
OUTPUT VOLTAGE vs. LOAD CURRENT
-4
-6
-8
-2
6
4
2
MAX220-01
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
10
0
20
0.1μF
EITHER V+ OR V- LOADED
VCC = ±5V
NO LOAD ON
TRANSMITTER OUTPUTS
(EXCEPT MAX220, MAX233A)
V- LOADED, NO LOAD ON V+
V+ LOADED, NO LOAD ON V-
1μF
0.1μF 1μF
11
10
4
0 10 40 60
AVAILABLE OUTPUT CURRENT
vs. DATA RATE
6
5
7
9
8
MAX220-02
DATA RATE (kbits/sec)
OUTPUT CURRENT (mA)
20 30 50
OUTPUT LOAD CURRENT
FLOWS FROM V+ TO VVCC
= +5.25V
ALL CAPS
1μF
ALL CAPS
0.1μF
VCC = +4.75V
+10V
-10V
MAX222/MAX242
ON-TIME EXITING SHUTDOWN
+5V
+5V
0V
0V
MAX220-03
500μs/div
V+, V- VOLTAGE (V)
1μF CAPS
V+
V+
V- VSHDN
0.1μF CAPS
1μF CAPS
0.1μF CAPS
MAX220MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
_______________________________________________________________________________________ 5
VCC...........................................................................-0.3V to +6V
V+................................................................(VCC - 0.3V) to +14V
V- ............................................................................+0.3V to -14V
Input Voltages
TIN ............................................................-0.3V to (VCC + 0.3V)
RIN......................................................................................±30V
Output Voltages
TOUT ...................................................(V+ + 0.3V) to (V- - 0.3V)
ROUT.........................................................-0.3V to (VCC + 0.3V)
Short-Circuit Duration, TOUT ......................................Continuous
Continuous Power Dissipation (TA = +70°C)
14-Pin Plastic DIP (derate 10.00mW/°C above +70°C)....800mW
16-Pin Plastic DIP (derate 10.53mW/°C above +70°C)....842mW
20-Pin Plastic DIP (derate 11.11mW/°C above +70°C)....889mW
24-Pin Narrow Plastic DIP
(derate 13.33mW/°C above +70°C) ..........1.07W
24-Pin Plastic DIP (derate 9.09mW/°C above +70°C)......500mW
16-Pin Wide SO (derate 9.52mW/°C above +70°C).........762mW
20-Pin Wide SO (derate 10 00mW/°C above +70°C).......800mW
24-Pin Wide SO (derate 11.76mW/°C above +70°C).......941mW
28-Pin Wide SO (derate 12.50mW/°C above +70°C) .............1W
44-Pin Plastic FP (derate 11.11mW/°C above +70°C) .....889mW
14-Pin CERDIP (derate 9.09mW/°C above +70°C) ..........727mW
16-Pin CERDIP (derate 10.00mW/°C above +70°C) ........800mW
20-Pin CERDIP (derate 11.11mW/°C above +70°C) ........889mW
24-Pin Narrow CERDIP
(derate 12.50mW/°C above +70°C) ..............1W
24-Pin Sidebraze (derate 20.0mW/°C above +70°C)..........1.6W
28-Pin SSOP (derate 9.52mW/°C above +70°C).............762mW
Operating Temperature Ranges
MAX2 _ _ C _ _......................................................0°C to +70°C
MAX2 _ _ E _ _...................................................-40°C to +85°C
MAX2 _ _ M _ _ ...............................................-55°C to +125°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
ABSOLUTE MAXIMUM RATINGS—MAX223/MAX230–MAX241
ELECTRICAL CHARACTERISTICS—MAX223/MAX230–MAX241
(MAX223/230/232/234/236/237/238/240/241, VCC = +5V ±10; MAX233/MAX235, VCC = 5V ±5%‚ C1–C4 = 1.0μF; MAX231/MAX239,
VCC = 5V ±10%; V+ = 7.5V to 13.2V; TA = TMIN to TMAX; unless otherwise noted.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
CONDITIONS MIN TYP MAX UNITS
Output Voltage Swing All transmitter outputs loaded with 3kΩ to ground ±5.0 ±7.3 V
VCC Power-Supply Current
No load,
TA = +25°C
5 10
7 15 mA
0.4 1
V+ Power-Supply Current
1.8 5
mA
5 15
Shutdown Supply Current TA = +25°C
15 50
Input Logic Threshold High V
TIN 2.0
EN, SHDN (MAX223);
EN, SHDN (MAX230/235/236/240/241)
2.4
Logic Pull-Up Current TIN = 0V 1.5 200
Receiver Input Voltage
Operating Range
-30 30 V
μA
μA
1 10
Input Logic Threshold Low TIN; EN, SHDN (MAX233); EN, SHDN (MAX230/235–241) 0.8 V
MAX231/239
MAX223/230/234–238/240/241
MAX232/233
PARAMETER
MAX239
MAX230/235/236/240/241
MAX231
MAX223
mA
MAX220MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
6 _______________________________________________________________________________________
V
0.8 1.2
PARAMETER CONDITIONS MIN TYP MAX UNITS
Normal operation
SHDN = 5V (MAX223)
SHDN = 0V (MAX235/236/240/241)
1.7 2.4
RS-232 Input Threshold Low
TA = +25°C,
VCC = 5V
0.6 1.5
RS-232 Input Threshold High V
TA = +25°C,
VCC = 5V Shutdown (MAX223)
SHDN = 0V,
EN = 5V (R4IN‚ R5IN)
1.5 2.4
ELECTRICAL CHARACTERISTICS—MAX223/MAX230–MAX241 (continued)
(MAX223/230/232/234/236/237/238/240/241, VCC = +5V ±10; MAX233/MAX235, VCC = 5V ±5%‚ C1–C4 = 1.0μF; MAX231/MAX239,
VCC = 5V ±10%; V+ = 7.5V to 13.2V; TA = TMIN to TMAX; unless otherwise noted.)
Shutdown (MAX223)
SHDN = 0V,
EN = 5V (R4IN, R5IN)
Normal operation
SHDN = 5V (MAX223)
SHDN = 0V (MAX235/236/240/241)
RS-232 Input Hysteresis VCC = 5V, no hysteresis in shutdown 0.2 0.5 1.0 V
RS-232 Input Resistance TA = +25°C, VCC = 5V 3 5 7 kΩ
TTL/CMOS Output Voltage Low IOUT = 1.6mA (MAX231/232/233, IOUT = 3.2mA) 0.4 V
TTL/CMOS Output Voltage High IOUT = -1mA 3.5 VCC - 0.4 V
TTL/CMOS Output Leakage Current
0V ≤ ROUT ≤ VCC; EN = 0V (MAX223);
EN = VCC (MAX235–241 )
0.05 ±10 μA
MAX223 600
Receiver Output Enable Time ns
Normal
operation MAX235/236/239/240/241 400
MAX223 900
Receiver Output Disable Time ns
Normal
operation MAX235/236/239/240/241 250
Normal operation 0.5 10
SHDN = 0V μs
(MAX223)
Propagation Delay 4 40
RS-232 IN to
TTL/CMOS OUT,
CL = 150pF 6 40
3 5.1 30
V/μs
MAX231/MAX232/MAX233, TA = +25°C, VCC = 5V,
RL = 3kΩ to 7kΩ, CL = 50pF to 2500pF, measured from
+3V to -3V or -3V to +3V
4 30
Transmitter Output Resistance VCC = V+ = V- = 0V, VOUT = ±2V 300 Ω
Transmitter Output Short-Circuit
Current
±10 mA
tPHLS
tPLHS
Transition Region Slew Rate
MAX223/MAX230/MAX234–241, TA = +25°C, VCC = 5V,
RL = 3kΩ to 7kΩ‚ CL = 50pF to 2500pF, measured from
+3V to -3V or -3V to +3V
MAX220MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
_______________________________________________________________________________________ 7
8.5
6.5
4.5 5.5
TRANSMITTER OUTPUT
VOLTAGE (VOH) vs. VCC
7.0
8.0
MAX220-04
VCC (V)
VOH (V)
5.0
7.5
1 TRANSMITTER
LOADED
3 TRANSMITTERS
LOADED
4 TRANSMITTERS
LOADED
2 TRANSMITTERS
LOADED
TA = +25°C
C1–C4 = 1μF
TRANSMITTER
LOADS =
3kΩ || 2500pF
7.4
6.0
0 2500
TRANSMITTER OUTPUT VOLTAGE (VOH)
vs. LOAD CAPACITANCE AT
DIFFERENT DATA RATES
6.4
6.2
7.2
7.0
MAX220-05
LOAD CAPACITANCE (pF)
VOH (V)
500 1000 1500 2000
6.8
6.6
160kbits/sec
80kbits/sec
20kbits/sec
TA = +25°C
VCC = +5V
3 TRANSMITTERS LOADED
RL = 3kΩ
C1–C4 = 1μF
12.0
4.0
0 2500
TRANSMITTER SLEW RATE
vs. LOAD CAPACITANCE
6.0
5.0
11.0
9.0
10.0
MAX220-06
LOAD CAPACITANCE (pF)
SLEW RATE (V/μs)
500 1000 1500 2000
8.0
7.0
TA = +25°C
VCC = +5V
LOADED, RL = 3kΩ
C1–C4 = 1μF
1 TRANSMITTER LOADED
2 TRANSMITTERS
LOADED
3 TRANSMITTERS
LOADED
4 TRANSMITTERS
LOADED
-6.0
-9.0
4.5 5.5
TRANSMITTER OUTPUT
VOLTAGE (VOL) vs. VCC
-8.0
-8.5
-6.5
-7.0
MAX220-07
VCC (V)
VOL (V)
5.0
-7.5
4 TRANSMITTERS
LOADED
TA = +25°C
C1–C4 = 1μF
TRANSMITTER
LOADS =
3kΩ || 2500pF
1 TRANSMITTER
LOADED
2 TRANSMITTERS
LOADED
3 TRANSMITTERS
LOADED
-6.0
-7.6
0 2500
TRANSMITTER OUTPUT VOLTAGE (VOL)
vs. LOAD CAPACITANCE AT
DIFFERENT DATA RATES
-7.0
-7.2
-7.4
-6.2
-6.4 MAX220-08
LOAD CAPACITANCE (pF)
VOL (V)
500 1000 1500 2000
-6.6
-6.8 160kbits/sec
80kbits/sec
20Kkbits/sec
TA = +25°C
VCC = +5V
3 TRANSMITTERS LOADED
RL = 3kΩ
C1–C4 = 1μF
10
-10
0 5 10 15 20 25 30 35 40 45 50
TRANSMITTER OUTPUT VOLTAGE (V+, V-)
vs. LOAD CURRENT
-2
-6
-4
-8
8
6
MAX220-09
CURRENT (mA)
V+, V- (V)
4
2
0
V+ AND VEQUALLY
LOADED
V- LOADED,
NO LOAD
ON V+
TA = +25°C
VCC = +5V
C1–C4 = 1μF
ALL TRANSMITTERS UNLOADED
V+ LOADED,
NO LOAD
ON V-
__________________________________________Typical Operating Characteristics
MAX223/MAX230–MAX241
*SHUTDOWN POLARITY IS REVERSED
FOR NON MAX241 PARTS
V+, V- WHEN EXITING SHUTDOWN
(1μF CAPACITORS)
MAX220-13
SHDN*
VO
V+
500ms/div
Input Logic Threshold Low
MAX220MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
8 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS—MAX225/MAX244–MAX249
ELECTRICAL CHARACTERISTICS—MAX225/MAX244–MAX249
(MAX225, VCC = 5.0V ±5%; MAX244–MAX249, VCC = +5.0V ±10%, external capacitors C1–C4 = 1μF; TA = TMIN to TMAX; unless otherwise
noted.)
Note 4: Input voltage measured with transmitter output in a high-impedance state, shutdown, or VCC = 0V.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Supply Voltage (VCC) ...............................................-0.3V to +6V
Input Voltages
TIN‚ ENA, ENB, ENR, ENT, ENRA,
ENRB, ENTA, ENTB..................................-0.3V to (VCC + 0.3V)
RIN .....................................................................................±25V
TOUT (Note 3).....................................................................±15V
ROUT ........................................................-0.3V to (VCC + 0.3V)
Short Circuit (one output at a time)
TOUT to GND............................................................Continuous
ROUT to GND............................................................Continuous
Continuous Power Dissipation (TA = +70°C)
28-Pin Wide SO (derate 12.50mW/°C above +70°C) .............1W
40-Pin Plastic DIP (derate 11.11mW/°C above +70°C) ...611mW
44-Pin PLCC (derate 13.33mW/°C above +70°C) ...........1.07W
Operating Temperature Ranges
MAX225C_ _, MAX24_C_ _ ..................................0°C to +70°C
MAX225E_ _, MAX24_E_ _ ...............................-40°C to +85°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering,10sec) ..............................+300°C
VCC = 0V,
VOUT = ±15V
Tables 1a–1d μA
±0.01 ±25
Normal operation
Shutdown
Tables 1a–1d, normal operation
All transmitter outputs loaded with 3kΩ to GND
ENA, ENB, ENT, ENTA, ENTB =
VCC, VOUT = ±15V
RS-232 Input Hysteresis V
RS-232 Input Threshold Low V
Output Voltage Swing ±5 ±7.5 V
Output Leakage Current (shutdown)
±0.01 ±25
Transmitter Output Resistance VCC = V+ = V- = 0V, VOUT = ±2V (Note 4) 300 10M Ω
μA
PARAMETER
±0.05 ±0.10
MIN TYP MAX UNITS
Normal operation, outputs disabled,
Tables 1a–1d, 0V ≤ VOUT ≤ VCC, ENR_ = VCC
TTL/CMOS Output Leakage Current
Shrinking VOUT = VCC 10 30
mA
Sourcing VOUT = GND -2 -10
TTL/CMOS Output Voltage High IOUT = -1.0mA 3.5 VCC - 0.2 V
TTL/CMOS Output Voltage Low IOUT = 3.2mA 0.2 0.4 V
3 5 7 kΩ
VCC = 5V 0.2 0.5 1.0
1.4 0.8 V
TTL/CMOS Output Short-Circuit Current
1.8 2.4 V
VCC = 5V 0.8 1.3
RS-232 Input Resistance
RS-232 Input Voltage Operating Range ±25 V
Output Short-Circuit Current VOUT = 0V ±7 ±30 mA
Data Rate 120 64 kbits/sec
CONDITIONS
VCC = 5V
μA
±0.01 ±1
Logic Pull-Up/lnput Current
10 50
Tables 1a–1d
RS-232 Input Threshold High
Input Logic Threshold High 2 1.4 V
RS-232 TRANSMITTERS
RS-232 RECEIVERS
MAX220MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
_______________________________________________________________________________________ 9
Operating Supply Voltage
4.75 5.25
V
Transmitter Enable Time
MAX225 10 20
tET
No load
MAX244–MAX249 11 30
5 10 30
MAX225 40
VCC Supply Current
(normal operation) 3kΩ loads on
all outputs MAX244–MAX249 57
mA
Transition Slew Rate
8 25
CL = 50pF to 2500pF, RL = 3kΩ to 7kΩ, VCC = 5V,
TA = +25°C, measured from +3V to -3V or -3V to +3V
TA = TMIN to TMAX
CONDITIONS
50
V/μs
MAX246–MAX249
(excludes charge-pump start-up)
Shutdown Supply Current μA
5
tPHLT 1.3 3.5
μs
tPLHT 1.5 3.5
Transmitter Disable Time, Figure 4
Transmitter Propagation Delay
TLL to RS-232 (normal operation),
Figure 1
μs
tDT 100 ns
Transmitter + to - Propagation
Delay Difference (normal operation)
tPHLT - tPLHT
MIN TYP MAX UNITS
350
PARAMETER
ns
Receiver + to - Propagation
Delay Difference (normal operation)
tPHLR - tPLHR 350 ns
MAX244–MAX249 4.5 5.5
MAX225
Leakage current ±1
Control Input Threshold low 1.4 0.8
Threshold high 2.4 1.4
V
μA
TA = +25°C
tPHLR 0.6 1.5
tPLHR 0.6 1.5
Receiver Propagation Delay
TLL to RS-232 (normal operation),
Figure 2
μs
tPHLS 0.6 10
tPLHS 3.0 10
Receiver Propagation Delay
TLL to RS-232 (low-power mode),
Figure 2
μs
Receiver-Output Enable Time, Figure 3 tER 100 500 ns
Receiver-Output Disable Time, Figure 3 tDR 100 500 ns
MAX225/MAX245–MAX249
(includes charge-pump start-up)
10 ms
POWER SUPPLY AND CONTROL LOGIC
AC CHARACTERISTICS
Note 5: The 300Ω minimum specification complies with EIA/TIA-232E, but the actual resistance when in shutdown mode or VCC =
0V is 10MΩ as is implied by the leakage specification.
ELECTRICAL CHARACTERISTICS—MAX225/MAX244–MAX249 (continued)
(MAX225, VCC = 5.0V ±5%; MAX244–MAX249, VCC = +5.0V ±10%, external capacitors C1–C4 = 1μF; TA = TMIN to TMAX; unless otherwise
noted.)
MAX220MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
10 ______________________________________________________________________________________
__________________________________________Typical Operating Characteristics
MAX225/MAX244–MAX249
18
2
0 1 2 3 4 5
TRANSMITTER SLEW RATE
vs. LOAD CAPACITANCE
8
6
4
16
MAX220-10
LOAD CAPACITANCE (nF)
TRANSMITTER SLEW RATE (V/μs)
14
12
10
VCC = 5V
EXTERNAL POWER SUPPLY
1μF CAPACITORS
40kb/s DATA RATE
8 TRANSMITTERS
LOADED WITH 3kΩ
10
-10
0 5 10 15 20 25 30 35
OUTPUT VOLTAGE
vs. LOAD CURRENT FOR V+ AND V-
-2
-4
-6
-8
8
MAX220-11
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
6
4
2
0
V+ AND V- LOADED
EITHER V+ OR
V- LOADED
V+ AND V- LOADED
VCC = 5V
EXTERNAL CHARGE PUMP
1μF CAPACITORS
8 TRANSMITTERS
DRIVING 5kΩ AND
2000pF AT 20kbits/sec
V- LOADED
V+ LOADED
9.0
5.0
0 1 2 3 4 5
TRANSMITTER OUTPUT VOLTAGE (V+, V-)
vs. LOAD CAPACITANCE AT
DIFFERENT DATA RATES
6.0
5.5
8.5
MAX220-12
LOAD CAPACITANCE (nF)
V+, V (V)
8.0
7.5
7.0
6.5
VCC = 5V WITH ALL TRANSMITTERS DRIVEN
LOADED WITH 5kΩ
10kb/sec
20kb/sec
40kb/sec
60kb/sec
100kb/sec
200kb/sec
ALL CAPACITIORS 1μF
MAX220MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
______________________________________________________________________________________ 11
INPUT
OUTPUT
+3V
V+
0V
V-
0V
tPLHT tPHLT
tPHLR
tPHLS
tPLHR
tPLHS
50%
VCC
50%
+3V
50%
INPUT
OUTPUT
*EXCEPT FOR R2 ON THE MAX243
WHERE -3V IS USED.
0V*
50%
GND
Figure 1. Transmitter Propagation-Delay Timing Figure 2. Receiver Propagation-Delay Timing
EN
RX IN
a) TEST CIRCUIT
b) ENABLE TIMING
c) DISABLE TIMING
EN INPUT
RECEIVER
OUTPUTS
RX OUT
RX
1k
0V
+3V
EN
EN
+0.8V
+3.5V
OUTPUT ENABLE TIME (tER)
VCC - 2V
VOL + 0.5V
VOH - 0.5V
OUTPUT DISABLE TIME (tDR)
VCC - 2V
+3V
0V
150pF
EN INPUT
VOH
RECEIVER
OUTPUTS
VOL
1 OR 0 TX
3k 50pF
-5V
+5V
OUTPUT DISABLE TIME (tDT)
V+
SHDN
+3V
0V
V-
0V
a) TIMING DIAGRAM
b) TEST CIRCUIT
Figure 3. Receiver-Output Enable and Disable Timing Figure 4. Transmitter-Output Disable Timing
MAX220MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
12 ______________________________________________________________________________________
ENT ENR OPERATION STATUS TRANSMITTERS RECEIVERS
0 0 Normal Operation All Active All Active
0 1 Normal Operation All Active All 3-State
1 0 Shutdown All 3-State All Low-Power Receive Mode
1 1 Shutdown All 3-State All 3-State
Table 1a. MAX245 Control Pin Configurations
ENT ENR
OPERATION
STATUS
TRANSMITTERS RECEIVERS
TA1–TA4 TB1–TB4 RA1–RA5 RB1–RB5
0 0 Normal Operation All Active All Active All Active All Active
0 1 Normal Operation All Active All Active
RA1–RA4 3-State,
RA5 Active
RB1–RB4 3-State,
RB5 Active
1 0 Shutdown All 3-State All 3-State
All Low-Power
Receive Mode
All Low-Power
Receive Mode
1 1 Shutdown All 3-State All 3-State
RA1–RA4 3-State,
RA5 Low-Power
Receive Mode
RB1–RB4 3-State,
RB5 Low-Power
Receive Mode
Table 1b. MAX245 Control Pin Configurations
Table 1c. MAX246 Control Pin Configurations
ENA ENB
OPERATION
STATUS
TRANSMITTERS RECEIVERS
TA1–TA4 TB1–TB4 RA1–RA5 RB1–RB5
0 0 Normal Operation All Active All Active All Active All Active
0 1 Normal Operation All Active All 3-State All Active
RB1–RB4 3-State,
RB5 Active
1 0 Shutdown All 3-State All Active
RA1–RA4 3-State,
RA5 Active
All Active
1 1 Shutdown All 3-State All 3-State
RA1–RA4 3-State,
RA5 Low-Power
Receive Mode
RB1–RB4 3-State,
RA5 Low-Power
Receive Mode
MAX220MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
______________________________________________________________________________________ 13
TA1–TA4 TB1–TB4 RA1–RA4 RB1–RB4
0 0 0 0 Normal Operation All Active All Active All Active All Active
0 0 0 1 Normal Operation All Active All Active All Active
All 3-State, except
RB5 stays active on
MAX247
0 0 1 0 Normal Operation All Active All Active All 3-State All Active
0 0 1 1 Normal Operation All Active All Active All 3-State
All 3-State, except
RB5 stays active on
MAX247
0 1 0 0 Normal Operation All Active All 3-State All Active All Active
0 1 0 1 Normal Operation All Active All 3-State All Active
All 3-State, except
RB5 stays active on
MAX247
0 1 1 0 Normal Operation All Active All 3-State All 3-State All Active
0 1 1 1 Normal Operation All Active All 3-State All 3-State
All 3-State, except
RB5 stays active on
MAX247
1 0 0 0 Normal Operation All 3-State All Active All Active All Active
1 0 0 1 Normal Operation All 3-State All Active All Active
All 3-State, except
RB5 stays active on
MAX247
1 0 1 0 Normal Operation All 3-State All Active All 3-State All Active
1 0 1 1 Normal Operation All 3-State All Active All 3-State
All 3-State, except
RB5 stays active on
MAX247
1 1 0 0 Shutdown All 3-State All 3-State
Low-Power
Receive Mode
Low-Power
Receive Mode
1 1 0 1 Shutdown All 3-State All 3-State
Low-Power
Receive Mode
All 3-State, except
RB5 stays active on
MAX247
1 1 1 0 Shutdown All 3-State All 3-State All 3-State
Low-Power
Receive Mode
1 1 1 1 Shutdown All 3-State All 3-State All 3-State
All 3-State, except
RB5 stays active on
MAX247
Table 1d. MAX247/MAX248/MAX249 Control Pin Configurations
MAX248
OPERATION
ENRB STATUS
MAX247 TA1–TA4 TB1–TB4 RA1–RA4 RB1–RB5
TRANSMITTERS
ENTA ENTB ENRA
MAX249 TA1–TA3 TB1–TB3 RA1–RA5 RB1–RB5
RECEIVERS
MAX220MAX249
_______________Detailed Description
The MAX220MAX249 contain four sections: dual
charge-pump DC-DC voltage converters, RS-232 drivers,
RS-232 receivers, and receiver and transmitter
enable control inputs.
Dual Charge-Pump Voltage Converter
The MAX220MAX249 have two internal charge-pumps
that convert +5V to ±10V (unloaded) for RS-232 driver
operation. The first converter uses capacitor C1 to double
the +5V input to +10V on C3 at the V+ output. The
second converter uses capacitor C2 to invert +10V to
-10V on C4 at the V- output.
A small amount of power may be drawn from the +10V
(V+) and -10V (V-) outputs to power external circuitry
(see the Typical Operating Characteristics section),
except on the MAX225 and MAX245–MAX247, where
these pins are not available. V+ and V- are not regulated,
so the output voltage drops with increasing load current.
Do not load V+ and V- to a point that violates the minimum
±5V EIA/TIA-232E driver output voltage when
sourcing current from V+ and V- to external circuitry.
When using the shutdown feature in the MAX222,
MAX225, MAX230, MAX235, MAX236, MAX240,
MAX241, and MAX245–MAX249, avoid using V+ and Vto
power external circuitry. When these parts are shut
down, V- falls to 0V, and V+ falls to +5V. For applications
where a +10V external supply is applied to the V+
pin (instead of using the internal charge pump to generate
+10V), the C1 capacitor must not be installed and
the SHDN pin must be tied to VCC. This is because V+
is internally connected to VCC in shutdown mode.
RS-232 Drivers
The typical driver output voltage swing is ±8V when
loaded with a nominal 5kΩ RS-232 receiver and VCC =
+5V. Output swing is guaranteed to meet the EIA/TIA-
232E and V.28 specification, which calls for ±5V minimum
driver output levels under worst-case conditions.
These include a minimum 3kΩ load, VCC = +4.5V, and
maximum operating temperature. Unloaded driver output
voltage ranges from (V+ -1.3V) to (V- +0.5V).
Input thresholds are both TTL and CMOS compatible.
The inputs of unused drivers can be left unconnected
since 400kΩ input pull-up resistors to VCC are built in
(except for the MAX220). The pull-up resistors force the
outputs of unused drivers low because all drivers invert.
The internal input pull-up resistors typically source 12μA,
except in shutdown mode where the pull-ups are disabled.
Driver outputs turn off and enter a high-impedance
state—where leakage current is typically
microamperes (maximum 25μA)—when in shutdown
mode, in three-state mode, or when device power is
removed. Outputs can be driven to ±15V. The powersupply
current typically drops to 8μA in shutdown mode.
The MAX220 does not have pull-up resistors to force the
ouputs of the unused drivers low. Connect unused inputs
to GND or VCC.
The MAX239 has a receiver three-state control line, and
the MAX223, MAX225, MAX235, MAX236, MAX240,
and MAX241 have both a receiver three-state control
line and a low-power shutdown control. Table 2 shows
the effects of the shutdown control and receiver threestate
control on the receiver outputs.
The receiver TTL/CMOS outputs are in a high-impedance,
three-state mode whenever the three-state enable
line is high (for the MAX225/MAX235/MAX236/MAX239–
MAX241), and are also high-impedance whenever the
shutdown control line is high.
When in low-power shutdown mode, the driver outputs
are turned off and their leakage current is less than 1μA
with the driver output pulled to ground. The driver output
leakage remains less than 1μA, even if the transmitter
output is backdriven between 0V and (VCC + 6V). Below
-0.5V, the transmitter is diode clamped to ground with
1kΩ series impedance. The transmitter is also zener
clamped to approximately VCC + 6V, with a series
impedance of 1kΩ.
The driver output slew rate is limited to less than 30V/μs
as required by the EIA/TIA-232E and V.28 specifications.
Typical slew rates are 24V/μs unloaded and
10V/μs loaded with 3Ω and 2500pF.
RS-232 Receivers
EIA/TIA-232E and V.28 specifications define a voltage
level greater than 3V as a logic 0, so all receivers invert.
Input thresholds are set at 0.8V and 2.4V, so receivers
respond to TTL level inputs as well as EIA/TIA-232E and
V.28 levels.
The receiver inputs withstand an input overvoltage up
to ±25V and provide input terminating resistors with
+5V-Powered, Multichannel RS-232
Drivers/Receivers
14 ______________________________________________________________________________________
PART SHDN EN EN(R) RECEIVERS
MAX223 __
Low
High
High
X
Low
High
High Impedance
Active
High Impedance
MAX225 __ __
High Impedance
Active
__
MAX235
MAX236
MAX240
Low
Low
High
__ __
Low
High
X
High Impedance
Active
High Impedance
Table 2. Three-State Control of Receivers
Low
High
SHDN
__
MAX220MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
______________________________________________________________________________________ 15
nominal 5kΩ values. The receivers implement Type 1
interpretation of the fault conditions of V.28 and
EIA/TIA-232E.
The receiver input hysteresis is typically 0.5V with a
guaranteed minimum of 0.2V. This produces clear output
transitions with slow-moving input signals, even
with moderate amounts of noise and ringing. The
receiver propagation delay is typically 600ns and is
independent of input swing direction.
Low-Power Receive Mode
The low-power receive-mode feature of the MAX223,
MAX242, and MAX245–MAX249 puts the IC into shutdown
mode but still allows it to receive information. This
is important for applications where systems are periodically
awakened to look for activity. Using low-power
receive mode, the system can still receive a signal that
will activate it on command and prepare it for communication
at faster data rates. This operation conserves
system power.
Negative Threshold—MAX243
The MAX243 is pin compatible with the MAX232A, differing
only in that RS-232 cable fault protection is removed
on one of the two receiver inputs. This means that control
lines such as CTS and RTS can either be driven or left
floating without interrupting communication. Different
cables are not needed to interface with different pieces of
equipment.
The input threshold of the receiver without cable fault
protection is -0.8V rather than +1.4V. Its output goes
positive only if the input is connected to a control line
that is actively driven negative. If not driven, it defaults
to the 0 or “OK to send” state. Normally‚ the MAX243’s
other receiver (+1.4V threshold) is used for the data line
(TD or RD)‚ while the negative threshold receiver is connected
to the control line (DTR‚ DTS‚ CTS‚ RTS, etc.).
Other members of the RS-232 family implement the
optional cable fault protection as specified by EIA/TIA-
232E specifications. This means a receiver output goes
high whenever its input is driven negative‚ left floating‚
or shorted to ground. The high output tells the serial
communications IC to stop sending data. To avoid this‚
the control lines must either be driven or connected
with jumpers to an appropriate positive voltage level.
Shutdown—MAX222–MAX242
On the MAX222‚ MAX235‚ MAX236‚ MAX240‚ and
MAX241‚ all receivers are disabled during shutdown.
On the MAX223 and MAX242‚ two receivers continue to
operate in a reduced power mode when the chip is in
shutdown. Under these conditions‚ the propagation
delay increases to about 2.5μs for a high-to-low input
transition. When in shutdown, the receiver acts as a
CMOS inverter with no hysteresis. The MAX223 and
MAX242 also have a receiver output enable input (EN
for the MAX242 and EN for the MAX223) that allows
receiver output control independent of SHDN (SHDN
for MAX241). With all other devices‚ SHDN (SHDN for
MAX241) also disables the receiver outputs.
The MAX225 provides five transmitters and five
receivers‚ while the MAX245 provides ten receivers and
eight transmitters. Both devices have separate receiver
and transmitter-enable controls. The charge pumps
turn off and the devices shut down when a logic high is
applied to the ENT input. In this state, the supply current
drops to less than 25μA and the receivers continue
to operate in a low-power receive mode. Driver outputs
enter a high-impedance state (three-state mode). On
the MAX225‚ all five receivers are controlled by the
ENR input. On the MAX245‚ eight of the receiver outputs
are controlled by the ENR input‚ while the remaining
two receivers (RA5 and RB5) are always active.
RA1–RA4 and RB1–RB4 are put in a three-state mode
when ENR is a logic high.
Receiver and Transmitter Enable
Control Inputs
The MAX225 and MAX245–MAX249 feature transmitter
and receiver enable controls.
The receivers have three modes of operation: full-speed
receive (normal active)‚ three-state (disabled)‚ and lowpower
receive (enabled receivers continue to function
at lower data rates). The receiver enable inputs control
the full-speed receive and three-state modes. The
transmitters have two modes of operation: full-speed
transmit (normal active) and three-state (disabled). The
transmitter enable inputs also control the shutdown
mode. The device enters shutdown mode when all
transmitters are disabled. Enabled receivers function in
the low-power receive mode when in shutdown.
MAX220MAX249
Tables 1a–1d define the control states. The MAX244
has no control pins and is not included in these tables.
The MAX246 has ten receivers and eight drivers with
two control pins, each controlling one side of the
device. A logic high at the A-side control input (ENA)
causes the four A-side receivers and drivers to go into
a three-state mode. Similarly, the B-side control input
(ENB) causes the four B-side drivers and receivers to
go into a three-state mode. As in the MAX245, one Aside
and one B-side receiver (RA5 and RB5) remain
active at all times. The entire device is put into shutdown
mode when both the A and B sides are disabled
(ENA = ENB = +5V).
The MAX247 provides nine receivers and eight drivers
with four control pins. The ENRA and ENRB receiver
enable inputs each control four receiver outputs. The
ENTA and ENTB transmitter enable inputs each control
four drivers. The ninth receiver (RB5) is always active.
The device enters shutdown mode with a logic high on
both ENTA and ENTB.
The MAX248 provides eight receivers and eight drivers
with four control pins. The ENRA and ENRB receiver
enable inputs each control four receiver outputs. The
ENTA and ENTB transmitter enable inputs control four
drivers each. This part does not have an always-active
receiver. The device enters shutdown mode and transmitters
go into a three-state mode with a logic high on
both ENTA and ENTB.
The MAX249 provides ten receivers and six drivers with
four control pins. The ENRA and ENRB receiver enable
inputs each control five receiver outputs. The ENTA
and ENTB transmitter enable inputs control three drivers
each. There is no always-active receiver. The
device enters shutdown mode and transmitters go into
a three-state mode with a logic high on both ENTA and
ENTB. In shutdown mode, active receivers operate in a
low-power receive mode at data rates up to
20kbits/sec.
__________Applications Information
Figures 5 through 25 show pin configurations and typical
operating circuits. In applications that are sensitive
to power-supply noise, VCC should be decoupled to
ground with a capacitor of the same value as C1 and
C2 connected as close as possible to the device.
+5V-Powered, Multichannel RS-232
Drivers/Receivers
16 ______________________________________________________________________________________
MAX220MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
______________________________________________________________________________________ 17
TOP VIEW
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
VCC
GND
T1OUT
C2+ R1IN
C1-
V+
C1+
MAX220
MAX232
MAX232A R1OUT
T1IN
T2IN
R2IN R2OUT
T2OUT
VC2-
DIP/SO
V+
V-
C1+ 2 +10V
C1
C2
1
3
4
5
11
10
12
9
6
14
7
13
8
T1IN
R1OUT
T2IN
R2OUT
T1OUT
R1IN
T2OUT
R2IN
+5V INPUT
C2+ -10V
C4
RS-232
OUTPUTS
RS-232
INPUTS
TTL/CMOS
INPUTS
TTL/CMOS
OUTPUTS
GND
15
5k
5k
400k
400k
+5V
+5V
+10V TO -10V
VOLTAGE INVERTER
+5V TO +10V
VOLTAGE DOUBLER
16
C3
C5
CAPACITANCE (μF)
DEVICE
MAX220
MAX232
MAX232A
C1
4.7
1.0
0.1
C2
4.7
1.0
0.1
C3
10
1.0
0.1
C4
10
1.0
0.1
C5
4.7
1.0
0.1
C2-
C1-
VCC
5k
DIP/SO
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
SHDN
VCC
GND
C1- T1OUT
V+
C1+
(N.C.) EN
R1IN
R1OUT
T1IN
T2OUT T2IN
VC2-
C2+
R2IN 9 10 R2OUT
MAX222
MAX242
20
19
18
17
16
15
14
13
1
2
3
4
5
6
7
8
SHDN
VCC
GND
C1- T1OUT
V+
C1+
(N.C.) EN
N.C.
R1IN
R1OUT
T2OUT N.C.
VC2-
C2+
12
11
9
10
T1IN
R2OUT T2IN
R2IN
MAX222
MAX242
SSOP
( ) ARE FOR MAX222 ONLY.
PIN NUMBERS IN TYPICAL OPERATING CIRCUIT ARE FOR DIP/SO PACKAGES ONLY.
V+
V-
3 +10V
C1
C2
2
4
5
6
12
11
13
7
15
8
14
9
T1IN
R1OUT
T2IN
R2OUT
T1OUT
(EXCEPT MAX220)
(EXCEPT MAX220)
R1IN
T2OUT
R2IN
+5V INPUT
C2+ -10V
C4
RS-232
OUTPUTS
RS-232
INPUTS
TTL/CMOS
INPUTS
TTL/CMOS
OUTPUTS
GND
16
5k
400k
400k
+5V
+5V
+10V TO -10V
VOLTAGE INVERTER
VCC
+5V TO +10V
VOLTAGE DOUBLER
17
C3
C5
1
10
18
SHDN
(N.C.) EN
ALL CAPACITORS = 0.1μF
C2-
C1+
C1-
TOP VIEW
Figure 5. MAX220/MAX232/MAX232A Pin Configuration and Typical Operating Circuit
Figure 6. MAX222/MAX242 Pin Configurations and Typical Operating Circuit
MAX220MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
18 ______________________________________________________________________________________
13
14
28
27
26
25
24
23
22
21
1
2
3
4
5
6
7
8
VCC
VCC VCC
400k
400k
400k
400k
400k
+5V T1OUT
+5V
0.1
+5V
3
28 27
4
25
24
23
26
5
6
7
22
GND
ENR
ENR
GND
21
+5V
+5V
+5V
T2OUT
T3OUT
T4OUT
5k
5k
5k
5k
5k
13 14
2
1
T5OUT
T5OUT
R1IN
R2IN
R3IN
R4IN
R5IN
T1IN
11
12
18
17
16
15
10
9
8
19
20
T2IN
T3IN
T4IN
T5IN
ENT
R2OUT
R3OUT
R4OUT
PINS (ENR, GND, VCC, T5OUT) ARE INTERNALLY CONNECTED.
CONNECT EITHER OR BOTH EXTERNALLY. T5OUT IS A SINGLE DRIVER.
R5OUT
R1OUT
VCC
ENT
T2IN T3IN
T1IN
ENR
ENR
T4IN
T5IN
R4OUT
R3IN R5OUT
R3OUT
R2OUT
R1OUT
20
19
18
17
9
10
11
12
R5IN
R4IN
T3OUT
T2OUT T4OUT
T1OUT
R1IN
R2IN
SO
MAX225
16
15
T5OUT
MAX225 FUNCTIONAL DESCRIPTION
5 RECEIVERS
5 TRANSMITTERS
2 CONTROL PINS
1 RECEIVER ENABLE (ENR)
1 TRANSMITTER ENABLE (ENT)
GND T5OUT
GND
TOP VIEW
Figure 7. MAX225 Pin Configuration and Typical Operating Circuit
MAX220MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
______________________________________________________________________________________ 19
GND
10
R3OUT 27
R4OUT 23
R3IN
R4IN
5k
5k
5 R2OUT R2IN 4
5k
RS-232
INPUTS
LOGIC
OUTPUTS
RS-232
OUTPUTS
TTL/CMOS
INPUTS
R2
8 R1OUT R1IN 9
5k
R1
R3
R4
19 R5OUT R5IN 18
5k
R5
7 T1IN T1OUT 2
+5V
400k
+5V
6 T2IN T2OUT 3 T2
400k
20 T3IN T3OUT 1
+5V
T3
400k
C1+
C1-
1.0μF
12
VCC
+5V INPUT
11
17
1.0μF
13
1.0μF
+5V TO +10V
VOLTAGE DOUBLER
26
1.0μF
T1
21 T4IN T4OUT 28
+5V
400k
T4
14
C2+
C2-
15
1.0μF 16
+10V TO -10V
VOLTAGE INVERTER
V+
22
24 EN (EN) 25
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
T4OUT
R3IN
R3OUT
SHDN (SHDN)
R4IN*
C2+
R4OUT*
T4IN
T3IN
R5OUT*
R5IN*
VC2-
C1-
V+
C1+
VCC
GND
R1IN
R1OUT
T1IN
T2IN
R2OUT
R2IN
T2OUT
T1OUT
T3OUT
Wide SO/
SSOP
MAX223
MAX241
EN (EN)
SHDN
(SHDN)
*R4 AND R5 IN MAX223 REMAIN ACTIVE IN SHUTDOWN
NOTE: PIN LABELS IN ( ) ARE FOR MAX241
VTOP
VIEW
Figure 8. MAX223/MAX241 Pin Configuration and Typical Operating Circuit
MAX220MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
20 ______________________________________________________________________________________
20
19
18
17
16
15
14
13
1
2
3
4
5
6
7
8
T5IN
N.C.
T2IN SHDN
T2OUT
T1OUT
T5OUT
T4IN
T3IN
C1+ VVCC
GND
T1IN
12
11
9
10
C2-
C1- C2+
V+
DIP/SO
MAX230
V+
V-
9
1T
C1+
C1-
8
10
11
12
5
4
14
13
2
3
1
20
T3IN
T4IN
T2IN
T5IN
T1OUT
T2OUT
+5V INPUT
C2+
C2-
RS-232
OUTPUTS
TTL/CMOS
INPUTS
GND
6
400k
+5V
400k
+5V
400k
+5V
400k
+5V
400k
+5V
+10V TO -10V
VOLTAGE INVERTER
VCC
+5V TO +10V
VOLTAGE DOUBLER
7
1.0μF
1.0μF
1.0μF
1.0μF
19
15
16
T3OUT T4OUT
x 18
T1IN
T3OUT
T4OUT
T5OUT
17
1.0μF
T1
T2
T3
T4
T5
N.C. SHDN
TOP VIEW
Figure 9. MAX230 Pin Configuration and Typical Operating Circuit
V+
V-
14
C1+
C1-
1
2
8
7
3
11
T2IN 4
T1IN T1OUT
T2OUT
+5V INPUT
RS-232
INPUTS
TTL/CMOS
INPUTS
GND
12 (14)
5k
5k
+12V TO -12V
VOLTAGE CONVERTER
13 (15)
1.0μF
1.0μF
C2
1.0μF
400k
+5V
400k
+5V
6
9 R1IN 10
R2OUT R2IN
R1OUT
5
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
V+
VCC
GND
T2OUT T1OUT
VCC+
MAX231
R1IN
R1OUT
T1IN
N.C. N.C.
T2IN
R2OUT
R2IN
SO
(12)
RS-232
OUTPUTS
TTL/CMOS
INPUTS
(11)
(10) (13)
VCC
PIN NUMBERS IN ( ) ARE FOR SO PACKAGE
14
13
12
11
10
9
8
1
2
3
4
5
6
7
V+
VCC
GND
T2OUT T1OUT
VCC+
MAX231
R1IN
R1OUT
T2IN T1IN
R2OUT
R2IN
DIP
+7.5V TO +12V
(16)
T1
T2
R1
R2
TOP VIEW
Figure 10. MAX231 Pin Configurations and Typical Operating Circuit
MAX220MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
______________________________________________________________________________________ 21
2
1
5
T2IN 18
T1IN T1OUT
T2OUT
+5V INPUT
RS-232
OUTPUTS
TTL/CMOS
OUTPUTS
GND GND
6 9
400k
+5V
400k
+5V
5k
5k
7
20
3 R1IN 4
R2OUT R2IN
R1OUT
19
RS-232
OUTPUTS
TTL/CMOS
INPUTS
VCC
( ) ARE FOR SO PACKAGE ONLY.
20
19
18
17
16
15
14
13
1
2
3
4
5
6
7
8
R2IN
T2OUT
R1IN VR1OUT
T1IN
C2-
C2+
V+ (C1-)
(V+) C1+ C1- (C1+)
VCC
GND
T1OUT
12
11
9
10
V- (C2+)
(V-) CS- C2+ (C2-)
GND
DIP/SO
MAX233
MAX233A
T2IN R2OUT
C1+
C1-
VVV+
C2+
C2-
C2-
C2+
8 (13)
13 (14)
12 (10)
17
14 (8)
11 (12)
15
16
10 (11)
DO NOT MAKE
CONNECTIONS TO
THESE PINS
INTERNAL -10
POWER SUPPLY
INTERNAL +10V
POWER SUPPLY
1.0μF
TOP VIEW
Figure 11. MAX233/MAX233A Pin Configuration and Typical Operating Circuit
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
T3OUT
T4OUT
T4IN
T1IN T3IN
T2IN
T2OUT
T1OUT
MAX234
VC2-
C2+
V+ C1-
C1+
VCC
GND
DIP/SO
V+
V-
C1+ 8
C1-
1.0μF
1.0μF
1.0μF
7
9
10
11
4
3
13
14
12
1
3
16
15
T1IN
T3IN
T2IN
T4IN
T1OUT
T3OUT
T2OUT
T4OUT
+5V INPUT
C2-
C2+
RS-232
OUTPUTS
TTL/CMOS
INPUTS
GND
5
+5V
+5V
+10V TO -10V
VOLTAGE INVERTER
VCC
+5V TO +10V
VOLTAGE DOUBLER
6
+5V
+5V
400k
400k
400k
400k
1.0μF
1.0μF
T1
T2
T4
T3
TOP VIEW
Figure 12. MAX234 Pin Configuration and Typical Operating Circuit
MAX220MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
22 ______________________________________________________________________________________
1.0μF
+5V INPUT
GND
11
6
23
R2OUT 5
RS-232
INPUTS
TTL/CMOS
OUTPUTS
14 13
21
R5OUT
5k
17 R4OUT 18
5k
R3OUT 24
5k
24
23
22
21
20
19
18
17
1
2
3
4
5
6
7
8
R3IN
R3OUT
T5IN
T2OUT SHDN
T1OUT
T3OUT
T4OUT
EN
T5OUT
R4IN
T1IN R4OUT
T2IN
R2OUT
R2IN
16
15
14
13
9
10
11
12
T4IN
T3IN
R5OUT
VCC R5IN
GND
R1IN
R1OUT
DIP
MAX235
5k
9 R1OUT R1IN 10
R2IN
R3IN
R4IN
R5IN
5k
7
15
3
T2IN 4
T3OUT RS-232
OUTPUTS
TTL/CMOS
INPUTS
22 T5IN T5OUT 19
+5V
16 T4IN T4OUT 1
+5V
T3IN 2
+5V
+5V
8 T1IN T1OUT
+5V
T2OUT
T1
T1
R2
R3
R4
R5
T2
T3
T5
T4
400k
400k
400k
400k
400k
SHDN
20 EN
12
VCC
TOP VIEW
Figure 13. MAX235 Pin Configuration and Typical Operating Circuit
MAX220MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
______________________________________________________________________________________ 23
GND
8
R2OUT 23 RS-232
INPUTS
TTL/CMOS
OUTPUTS
17 16
21
R3OUT
R2IN
R3IN
5k
5k
5 R1OUT R1IN 4
5k
RS-232
OUTPUTS
TTL/CMOS
INPUTS
R1
R2
R3
7 T1IN T1OUT 2
+5V
T1
400k
6 T2IN 3
+5V
T2OUT T2
400k
18 T3IN T3OUT 1
+5V
T3
400k
19 T4IN T4OUT 24
+5V
T4
400k
SHDN
20 EN
11
C1+
C1-
1.0μF
10
12
13
14
15
+5V INPUT
C2+
C2-
VCC
+5V TO +10V
VOLTAGE DOUBLER
9 1.0μF
+10V TO -10V 1.0μF
VOLTAGE INVERTER
22
24
23
22
21
20
19
18
17
1
2
3
4
5
6
7
8
T4OUT
R2IN
R2OUT
R1IN SHDN
T2OUT
T1OUT
T3OUT
T4IN
T3IN
GND R3OUT
T1IN
T2IN
R1OUT
16
15
14
13
9
10
11
12
R3IN
VC2-
C1- C2+
V+
C1+
VCC
DIP/SO
MAX236 EN
1.0μF
1.0μF
TOP VIEW
V+
VFigure
14. MAX236 Pin Configuration and Typical Operating Circuit
MAX220MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
24 ______________________________________________________________________________________
GND
8
R2OUT 23 RS-232
INPUTS
TTL/CMOS
OUTPUTS
17 R3OUT 16
R2IN
R3IN
5k
5k
5 R1OUT R1IN 4
5k
RS-232
OUTPUTS
TTL/CMOS
INPUTS
R1
R2
R3
7 T1IN T1OUT 2
+5V
T1
400k
6 T2IN 3
+5V
T2OUT T2
400k
18 T3IN T3OUT 1
+5V
T3
400k
21 T5IN T5OUT 20
+5V
T5
400k
C1+ 11
C1-
1.0μF
10
12
13
14
15
+5V INPUT
C2+
C2-
VCC
+5V TO +10V
VOLTAGE DOUBLER
9 1.0μF
1.0μF
+10V TO -10V
VOLTAGE INVERTER
22
24
23
22
21
20
19
18
17
1
2
3
4
5
6
7
8
T4OUT
R2IN
R2OUT
R1IN T5IN
T2OUT
T1OUT
T3OUT
T4IN
T3IN
GND R3OUT
T1IN
T2IN
R1OUT
16
15
14
13
9
10
11
12
R3IN
VC2-
C1- C2+
V+
C1+
VCC
DIP/SO
MAX237 T5OUT
1.0μF
1.0μF
19 T4IN T4OUT 24
+5V
T4
400k
V+
VTOP
VIEW
Figure 15. MAX237 Pin Configuration and Typical Operating Circuit
MAX220MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
______________________________________________________________________________________ 25
GND
8
R2OUT 3
22 R3OUT 23
R2IN
R3IN
5k
5k
6 R1OUT R1IN 7
5k
RS-232
OUTPUTS
TTL/CMOS
INPUTS
RS-232
INPUTS
TTL/CMOS
OUTPUTS
R1
R2
R3
17 R4OUT R4IN 16
5k
R4
5 T1IN T1OUT 2
+5V
400k
+5V
18 T2IN T2OUT 1 T2
400k
19 T3IN T3OUT 24
+5V
T3
400k
C1+ 11
C1-
1.0μF
10
12
13
14
15
+5V INPUT
C2+
C2-
VCC
+5V TO +10V
VOLTAGE DOUBLER
9 1.0μF
1.0μF
+10V TO -10V
VOLTAGE INVERTER
4
1.0μF
1.0μF
21 T4IN T4OUT 20
+5V
T4
400k
24 T1
23
22
21
20
19
18
17
1
2
3
4
5
6
7
8
T3OUT
R3IN
R3OUT
R2OUT T4IN
R2IN
T1OUT
T2OUT
TOP VIEW
T3IN
T2IN
GND R4OUT
R1IN
R1OUT
T1IN
16
15
14
13
9
10
11
12
R4IN
VC2-
C1- C2+
V+
C1+
VCC
DIP/SO
MAX238 T4OUT
V+
VFigure
16. MAX238 Pin Configuration and Typical Operating Circuit
MAX220MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
26 ______________________________________________________________________________________
GND
3
R3OUT 18
R4OUT 12
R3IN
R4IN
5k
5k
22 R2OUT R2IN 21
5k
RS-232
OUTPUTS
TTL/CMOS
INPUTS
RS-232
INPUTS
TTL/CMOS
OUTPUTS
R2
1 R1OUT R1IN 2
5k
R1
R3
R4
10 R5OUT R5IN 9
5k
R5
24 T1IN T1OUT 19
+5V
400k
+5V
23 T2IN T2OUT 20 T2
400k
16 T3IN T3OUT 13
+5V
T3
400k
C1+
C1-
1.0μF
6 VCC 8
+5V INPUT
4 5
1.0μF
+10V TO -10V
VOLTAGE INVERTER
17
1.0μF
T1
24
23
22
21
20
19
18
17
1
2
3
4
5
6
7
8
T1IN
T2IN
R2OUT
VCC R2IN
GND
R1IN
R1OUT
T1OUT
R3IN
V- R3OUT
CC+
V+
16
15
14
13
9
10
11
12
T3IN
N.C.
EN
R4IN T3OUT
R4OUT
R5OUT
R5IN
DIP/SO
MAX239 T2OUT
7.5V TO 13.2V
INPUT
7
V+
11
14 EN 15
N.C.
VTOP
VIEW
Figure 17. MAX239 Pin Configuration and Typical Operating Circuit
MAX220MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
______________________________________________________________________________________ 27
GND
18
R3OUT 4
R4OUT 40
R3IN
R4IN
5k
5k
13 R2OUT R2IN 10
5k
RS-232
INPUTS
TTL/CMOS
OUTPUTS
RS-232
OUTPUTS
TTL/CMOS
INPUTS
R2
16 R1OUT R1IN 17
5k
R1
R3
R4
36 R5OUT R5IN 35
5k
R5
15 T1IN T1OUT 7
+5V 400k
+5V
14 T2IN T2OUT 8 T2
400k
37 T3IN T3OUT 6
+5V
T3
400k
C1+
C1-
1.0μF
25
VCC
+5V INPUT
19
30
1.0μF
26
1.0μF
+5V TO +10V
VOLTAGE DOUBLER
3
1.0μF
T1
+5V
2 T5IN T5 T5OUT 41
400k
38 T4IN T4OUT 5
+5V 400k
T4
27
C2+
C2-
28
1.0μF 29
+5V TO -10V
VOLTAGE INVERTER
V+
39
42 EN 43
Plastic FP
MAX240
SHDN
EN
T5OUT
R4IN
R4OUT
R5OUT
R5IN
N.C.
N.C.
T3IN
T4IN
R2OUT
T2IN
T1IN
R1OUT
R1IN
N.C.
N.C.
N.C.
N.C.
VCC
GND
R2IN
N.C.
T4OUT
T2OUT
T1OUT
T3OUT
N.C.
R3IN
R3OUT
N.C.
T5IN
N.C.
C1+
C2
V+
C1-
C2+
N.C.
VN.
C.
N.C.
N.C.
33
32
31
30
29
28
27
26
25
24
23
34
35
36
37
38
39
40
41
42
43
44
1
2
3
4
5
6
7
8
9
10
11
22
21
20
19
18
17
16
15
14
13
12
SHDN
TOP VIEW
VFigure
18. MAX240 Pin Configuration and Typical Operating Circuit
MAX220MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
28 ______________________________________________________________________________________
V+
VC1+
2 +10V
C1-
1
3
4
5
11
10
12
9
6
14
7
13
8
T1IN
R1OUT
T2IN
R2OUT
T1OUT
R1IN
T2OUT
R2IN
+5V INPUT
C2+
C2-
-10V
RS-232
OUTPUTS
RS-232
INPUTS
TTL/CMOS
INPUTS
TTL/CMOS
OUTPUTS
GND
15
5k
5k
400k
400k
+5V
+5V
+10V TO -10V
VOLTAGE INVERTER
+5V TO +10V
VOLTAGE DOUBLER
16
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
C1+ VCC
GND
T1OUT
R1IN
R1OUT
T1IN
T2IN
R2OUT
MAX243
DIP/SO
V+
C1-
VC2+
C2-
T2OUT
R2IN
0.1μF
0.1μF
0.1μF
0.1μF
ALL CAPACITORS = 0.1μF
0.1μF
RECEIVER INPUT
≤ -3 V
OPEN
≥ +3V
R1 OUTPUT
HIGH
HIGH
LOW
R2 OUTPUT
HIGH
LOW
LOW
TOP VIEW
VCC
Figure 19. MAX243 Pin Configuration and Typical Operating Circuit
MAX220MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
______________________________________________________________________________________ 29
400k
+10V TO -10V VOLTAGE INVERTER
+5V TO +10V VOLTAGE DOUBLER
VCC
400k
400k
GND
+5V +5V
+5V +5V
+5V
25
24
23
21
20
2
1μF
1μF
1μF 1μF
1μF
16
3
17
4
18
5k
5k
5k
5k
5k
5k
5k
5k
5k
5k
C2-
C2+
C1-
C1+
TA2OUT
TA2IN
TA3OUT
TA3IN
TA4OUT
TA4IN
9 RA1IN
10 RA1OUT
8 RA2IN
11 RA2OUT
7 RA3IN
12 RA3OUT
6 RA4IN
13 RA4OUT
5 RA5IN
14
19
RA5OUT
26
22
43
29
42
28
41
27
36
35
37
34
38
33
39
32
40
31
VV+
TB2OUT
TB2IN
400k
2
15
TA1OUT
TA1IN
44
30
TB1OUT
TB1IN
TB3OUT
TB3IN
TB4OUT
TB4IN
RB1IN
RB1OUT
RB2IN
RB2OUT
RB3IN
RB3OUT
RB4IN
RB4OUT
RB5IN
RB5OUT
MAX249 FUNCTIONAL DESCRIPTION
10 RECEIVERS
5 A-SIDE RECEIVER
5 B-SIDE RECEIVER
8 TRANSMITTERS
4 A-SIDE TRANSMITTERS
4 B-SIDE TRANSMITTERS
NO CONTROL PINS
5 4 3 2 1 44 43 42 41 40
19 20 21 22 23 24 25 26 27 28
8
9
10
11
12
13
14
15
16
17 29
30
31
32
33
34
35
36
37
38
TA3IN
VCC
RA5IN
MAX244
PLCC
TOP VIEW
TA4OUT
TA3OUT
TA2OUT
TA1OUT
TB1OUT
TB2OUT
TB3OUT
TB4OUT
RB5IN
GND
V+
C1+
C2+
C1-
VC2-
TB3IN
TB4IN
RB3IN
RB2IN
RB1IN
RB1OUT
RB2OUT
RB3OUT
RB4OUT
RB5OUT
TB1IN
TB2IN
TA2IN
TA1IN
RA5OUT
RA4OUT
RA3OUT
RA2OUT
RA1OUT
RA1IN
RA2IN
RA3IN 7 39 RB4IN
6
18
TA4IN RA4IN
+5V +5V
+5V +5V
Figure 20. MAX244 Pin Configuration and Typical Operating Circuit
MAX220MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
30 ______________________________________________________________________________________
400k
VCC
400k
400k
GND
+5V +5V
+5V +5V
+5V
40
17
1μF
3
18
4
19
5
5k
5k
5k
5k
5k
5k
5k
5k
5k
5k
TA2OUT
TA2IN
TA3OUT
TA3IN
TA4OUT
TA4IN
1
11 RA1IN
10 RA1OUT
12 RA2IN
9 RA2OUT
13 RA3IN
8 RA3OUT
14 RA4IN
7 RA4OUT
15 RA5IN
6
20
RA5OUT
23
37
22
36
21
35
29
30
28
31
27
32
26
33
25
34
TB2OUT
TB2IN
TB3OUT
TB3IN
TB4OUT
TB4IN
RB1IN
RB1OUT
RB2IN
RB2OUT
RB3IN
RB3OUT
RB4IN
RB4OUT
RB5IN
RB5OUT
+5V +5V
400k
16
2
TA1OUT
TA1IN
24
38
TB1OUT
TB1IN
40 V +5V +5V CC
ENT
TB1IN
TB2IN
TB3IN
TB4IN
RB5OUT
RB4OUT
RB3OUT
RB2OUT
RB1OUT
RB1IN
RB2IN
RB3IN
RB4IN
RB5IN
TB1OUT
TB2OUT
TB3OUT
TB4OUT
39
38
37
36
35
34
33
32
31
1
2
3
4
5
6
7
8
9
10
ENR
TA1IN
TA2IN
TA3IN
TA4IN
RA5OUT
RA4OUT
RA3OUT
RA2OUT
RA1OUT
RA1IN
RA2IN
RA3IN
RA4IN
RA5IN
TA1OUT
TA2OUT
TA3OUT
TA4OUT
GND
TOP VIEW
MAX245
30
29
28
27
26
25
24
23
22
21
11
12
13
14
15
16
17
18
19
DIP
20
MAX245 FUNCTIONAL DESCRIPTION
10 RECEIVERS
5 A-SIDE RECEIVERS (RA5 ALWAYS ACTIVE)
5 B-SIDE RECEIVERS (RB5 ALWAYS ACTIVE)
8 TRANSMITTTERS
4 A-SIDE TRANSMITTERS
2 CONTROL PINS
1 RECEIVER ENABLE (ENR)
1 TRANSMITTER ENABLE (ENT)
ENR ENT 39
Figure 21. MAX245 Pin Configuration and Typical Operating Circuit
MAX220MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
______________________________________________________________________________________ 31
400k
VCC
400k
GND
+5V
+5V
+5V
+5V
+5V
40
16
1μF
2
18
4
TA1OUT
TA1IN
TA3OUT
TA3IN
20
24
38
22
36
1 39
TB1OUT
TB1IN
TB3OUT
TB3IN
400k
+5V
17
3
TA2OUT
TA2IN
+5V
23
37
TB2OUT
TB2IN
400k
+5V
19
5
TA4OUT
TA4IN
+5V
21
35
TB4OUT
TB4IN
5k
5k
5k
5k
5k
5k
5k
5k
5k
5k
11 RA1IN
10 RA1OUT
12 RA2IN
9 RA2OUT
13 RA3IN
8 RA3OUT
14 RA4IN
7 RA4OUT
15 RA5IN
6 RA5OUT
29
30
28
31
27
32
26
33
25
34
RB1IN
RB1OUT
RB2IN
RB2OUT
RB3IN
RB3OUT
RB4IN
RB4OUT
RB5IN
RB5OUT
40 VCC
ENB
TB1IN
TB2IN
TB3IN
TB4IN
RB5OUT
RB4OUT
RB3OUT
RB2OUT
RB1OUT
RB1IN
RB2IN
RB3IN
RB4IN
RB5IN
TB1OUT
TB2OUT
TB3OUT
TB4OUT
39
38
37
36
35
34
33
32
31
1
2
3
4
5
6
7
8
9
10
ENA
TA1IN
TA2IN
TA3IN
TA4IN
RA5OUT
RA4OUT
RA3OUT
RA2OUT
RA1OUT
RA1IN
RA2IN
RA3IN
RA4IN
RA5IN
TA1OUT
TA2OUT
TA3OUT
TA4OUT
GND
TOP VIEW
MAX246
30
29
28
27
26
25
24
23
22
21
11
12
13
14
15
16
17
18
19
DIP
20
MAX246 FUNCTIONAL DESCRIPTION
10 RECEIVERS
5 A-SIDE RECEIVERS (RA5 ALWAYS ACTIVE)
5 B-SIDE RECEIVERS (RB5 ALWAYS ACTIVE)
8 TRANSMITTERS
4 A-SIDE TRANSMITTERS
4 B-SIDE TRANSMITTERS
2 CONTROL PINS
ENABLE A-SIDE (ENA)
ENABLE B-SIDE (ENB)
ENA ENB
Figure 22. MAX246 Pin Configuration and Typical Operating Circuit
MAX220MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
32 ______________________________________________________________________________________
400k
VCC
400k
GND
+5V
+5V
+5V
+5V
+5V
1
40
16
1μF
2
18
4
5k
5k
5k
5k
5k
5k
5k
5k
ENTA
TA1OUT
TA1IN
TA3OUT
TA3IN
6 RB5OUT
12 RA1IN
10 RA1OUT
13 RA2IN
9 RA2OUT
14 RA3IN
8 RA3OUT
15 RA4IN
7
20
RA4OUT
11
39
24
38
22
36
29
31
28
32
27
33
26
34
ENRA 30
ENTB
TB1OUT
TB1IN
TB3OUT
TB3IN
RB1IN
5k
RB5IN 25
RB1OUT
RB2IN
RB2OUT
RB3IN
RB3OUT
RB4IN
RB4OUT
ENRB
400k
+5V
17
3
TA2OUT
TA2IN
+5V
23
37
TB2OUT
TB2IN
400k
+5V
19
5
TA4OUT
TA4IN
+5V
21
35
TB4OUT
TB4IN
40 VCC
ENTB
TB1IN
TB2IN
TB3IN
TB4IN
RB4OUT
RB3OUT
RB2OUT
RB1OUT
RB1IN
RB2IN
RB3IN
RB4IN
RB5IN
TB1OUT
TB2OUT
TB3OUT
TB4OUT
39
38
37
36
35
34
33
32
31
1
2
3
4
5
6
7
8
9
10
ENTA
TA1IN
TA2IN
TA3IN
TA4IN
RB5OUT
RA4OUT
RA3OUT
RA2OUT
RA1OUT
RA1IN
RA2IN
RA3IN
RA4IN
TA1OUT
TA2OUT
TA3OUT
TA4OUT
GND
TOP VIEW
MAX247
30
29
28
27
26
25
24
23
22
21
11
12
13
14
15
16
17
18
19
DIP
20
ENRA ENRB
MAX247 FUNCTIONAL DESCRIPTION
9 RECEIVERS
4 A-SIDE RECEIVERS
5 B-SIDE RECEIVERS (RB5 ALWAYS ACTIVE)
8 TRANSMITTERS
4 A-SIDE TRANSMITTERS
4 B-SIDE TRANSMITTERS
4 CONTROL PINS
ENABLE RECEIVER A-SIDE (ENRA)
ENABLE RECEIVER B-SIDE (ENRB)
ENABLE RECEIVER A-SIDE (ENTA)
ENABLE RECEIVERr B-SIDE (ENTB)
Figure 23. MAX247 Pin Configuration and Typical Operating Circuit
MAX220MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
______________________________________________________________________________________ 33
400k
+10V TO -10V VOLTAGE INVERTER
+5V TO +10V VOLTAGE DOUBLER
VCC
400k
GND
+5V
+5V
+5V
+5V
+5V
18
25
24
23
21
20
1
1μF
1μF
1μF
1μF
1μF
14
3
16
5k
5k
5k
5k
5k
5k
5k
5k
ENTA
C2-
C2+
C1-
C1+
TA1OUT
TA1IN
TA3OUT
TA3IN
8 RA1IN
10 RA1OUT
7 RA2IN
11 RA2OUT
6 RA3IN
12 RA3OUT
5 RA4IN
13
19
RA4OUT
9
27
26
22
44
31
42
29
37
35
38
34
39
33
40
32
ENRA 36
ENTB
VV+
TB1OUT
TB1IN
TB3OUT
TB3IN
RB1IN
RB1OUT
RB2IN
RB2OUT
RB3IN
RB3OUT
RB4IN
RB4OUT
ENRB
400k
+5V
2
15
TA2OUT
TA2IN
+5V
43
30
TB2OUT
TB2IN
400k
+5V
4
17
TA4OUT
TA4IN
+5V
41
28
TB4OUT
TB4IN
5 4 3 2 1 44 43 42 41 40
19 20 21 22 23 24 25 26 27 28
8
9
10
11
12
13
14
15
16
17 29
30
31
32
33
34
35
36
37
38
TA4IN
VCC
RA4IN
MAX248
PLCC
TOP VIEW
TA4OUT
TA3OUT
TA2OUT
TA1OUT
TB1OUT
TB2OUT
TB3OUT
TA4OUT
RB4IN
GND
V+
C1+
C2+
C1-
VC2-
TB4IN
ENTB
RB2IN
RB1IN
RB1OUT
RB2OUT
RB3OUT
RB4OUT
TB1IN
TB2IN
TB3IN
TA3IN
TA2IN
TA1IN
RA4OUT
RA3OUT
RA2OUT
RA1OUT
ENRA
RA1IN
RA2IN 7 39 RB3IN
6
18
RA3IN
ENRB
ENTA
MAX248 FUNCTIONAL DESCRIPTION
8 RECEIVERS
4 A-SIDE RECEIVERS
4 B-SIDE RECEIVERS
8 TRANSMITTERS
4 A-SIDE TRANSMITTERS
4 B-SIDE TRANSMITTERS
4 CONTROL PINS
ENABLE RECEIVER A-SIDE (ENRA)
ENABLE RECEIVER B-SIDE (ENRB)
ENABLE RECEIVER A-SIDE (ENTA)
ENABLE RECEIVER B-SIDE (ENTB)
Figure 24. MAX248 Pin Configuration and Typical Operating Circuit
MAX220MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
34 ______________________________________________________________________________________
400k
+10V TO -10V VOLTAGE INVERTER
+5V TO +10V VOLTAGE DOUBLER
VCC
400k
400k
GND
+5V
+5V
+5V
+5V
+5V
+5V
+5V
18
25
24
23
21
20
1
1μF
1μF
1μF
1μF
15
2
16
3
17
5k
5k
5k
5k
5k
5k
5k
5k
5k
5k
ENTA
C2-
C2+
C1-
C1+
TA1OUT
TA1IN
TA2OUT
TA2IN
TA3OUT
TA3IN
8 RA1IN
10 RA1OUT
7 RA2IN
11 RA2OUT
6 RA3IN
12 RA3OUT
5 RA4IN
13 RA4OUT
4 RA5IN
14
19
RA5OUT
9
27
26
22
44
30
43
29
42
28
37
35
38
34
39
33
40
32
41
31
ENRA 36
ENTB
VV+
TB1OUT
TB1IN
TB2OUT
TB2IN
TB3OUT
TB3IN
RB1IN
RB1OUT
RB2IN
RB2OUT
RB3IN
RB3OUT
RB4IN
RB4OUT
RB5IN
RB5OUT
ENRB
5 4 3 2 1 44 43 42 41 40
19 20 21 22 23 24 25 26 27 28
8
9
10
11
12
13
14
15
16
17 29
30
31
32
33
34
35
36
37
38
VCC
RA4IN
RA5IN
MAX249
PLCC
TOP VIEW
TA3OUT
TA2OUT
TA1OUT
TB1OUT
TB2OUT
TB3OUT
RB4IN
RB5IN
GND
V+
C1+
C2+
C1-
VC2-
TB3IN
ENTB
RB2IN
RB1IN
RB1OUT
MAX249 FUNCTIONAL DESCRIPTION
10 RECEIVERS
5 A-SIDE RECEIVERS
5 B-SIDE RECEIVERS
6 TRANSMITTERS
3 A-SIDE TRANSMITTERS
3 B-SIDE TRANSMITTERS
4 CONTROL PINS
ENABLE RECEIVER A-SIDE (ENRA)
ENABLE RECEIVER B-SIDE (ENRB)
ENABLE RECEIVER A-SIDE (ENTA)
ENABLE RECEIVER B-SIDE (ENTB)
RB2OUT
RB3OUT
RB4OUT
RB5OUT
TB1IN
TA3IN TB2IN
TA2IN
TA1IN
RA4OUT
RA5OUT
RA3OUT
RA2OUT
RA1OUT
ENRA
RA1IN
RA2IN 7 39 RB3IN
6
18
RA3IN
ENRB
ENTA
1μF
Figure 25. MAX249 Pin Configuration and Typical Operating Circuit
MAX220MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
______________________________________________________________________________________ 35
___________________________________________Ordering Information (continued)
PART
MAX222CPN 0°C to +70°C
TEMP. RANGE PIN-PACKAGE
18 Plastic DIP
MAX222CWN 0°C to +70°C 18 Wide SO
MAX222C/D 0°C to +70°C Dice*
MAX222EPN -40°C to +85°C 18 Plastic DIP
MAX222EWN -40°C to +85°C 18 Wide SO
MAX222EJN -40°C to +85°C 18 CERDIP
MAX222MJN -55°C to +125°C 18 CERDIP
MAX223CAI 0°C to +70°C 28 SSOP
MAX223CWI 0°C to +70°C 28 Wide SO
MAX223C/D 0°C to +70°C Dice*
MAX223EAI -40°C to +85°C 28 SSOP
MAX223EWI -40°C to +85°C 28 Wide SO
MAX225CWI 0°C to +70°C 28 Wide SO
MAX225EWI -40°C to +85°C 28 Wide SO
MAX230CPP 0°C to +70°C 20 Plastic DIP
MAX230CWP 0°C to +70°C 20 Wide SO
MAX230C/D 0°C to +70°C Dice*
MAX230EPP -40°C to +85°C 20 Plastic DIP
MAX230EWP -40°C to +85°C 20 Wide SO
MAX230EJP -40°C to +85°C 20 CERDIP
MAX230MJP -55°C to +125°C 20 CERDIP
MAX231CPD 0°C to +70°C 14 Plastic DIP
MAX231CWE 0°C to +70°C 16 Wide SO
MAX231CJD 0°C to +70°C 14 CERDIP
MAX231C/D 0°C to +70°C Dice*
MAX231EPD -40°C to +85°C 14 Plastic DIP
MAX231EWE -40°C to +85°C 16 Wide SO
MAX231EJD -40°C to +85°C 14 CERDIP
MAX231MJD -55°C to +125°C 14 CERDIP
MAX232CPE 0°C to +70°C 16 Plastic DIP
MAX232CSE 0°C to +70°C 16 Narrow SO
MAX232CWE 0°C to +70°C 16 Wide SO
MAX232C/D 0°C to +70°C Dice*
MAX232EPE -40°C to +85°C 16 Plastic DIP
MAX232ESE -40°C to +85°C 16 Narrow SO
MAX232EWE -40°C to +85°C 16 Wide SO
MAX232EJE -40°C to +85°C 16 CERDIP
MAX232MJE -55°C to +125°C 16 CERDIP
MAX232MLP -55°C to +125°C 20 LCC
MAX232ACPE 0°C to +70°C 16 Plastic DIP
MAX232ACSE 0°C to +70°C 16 Narrow SO
MAX232ACWE 0°C to +70°C 16 Wide SO
MAX232AC/D
MAX232AEPE -40°C to +85°C 16 Plastic DIP
MAX232AESE
0°C to +70°C Dice*
-40°C to +85°C 16 Narrow SO
MAX232AEWE -40°C to +85°C 16 Wide SO
MAX232AEJE -40°C to +85°C 16 CERDIP
MAX232AMJE -55°C to +125°C 16 CERDIP
MAX232AMLP -55°C to +125°C 20 LCC
MAX233CPP 0°C to +70°C 20 Plastic DIP
MAX233EPP -40°C to +85°C 20 Plastic DIP
MAX233ACPP 0°C to +70°C 20 Plastic DIP
MAX233ACWP 0°C to +70°C 20 Wide SO
MAX233AEPP -40°C to +85°C 20 Plastic DIP
MAX233AEWP -40°C to +85°C 20 Wide SO
MAX234CPE 0°C to +70°C 16 Plastic DIP
MAX234CWE 0°C to +70°C 16 Wide SO
MAX234C/D 0°C to +70°C Dice*
MAX234EPE -40°C to +85°C 16 Plastic DIP
MAX234EWE -40°C to +85°C 16 Wide SO
MAX234EJE -40°C to +85°C 16 CERDIP
MAX234MJE -55°C to +125°C 16 CERDIP
MAX235CPG 0°C to +70°C 24 Wide Plastic DIP
MAX235EPG -40°C to +85°C 24 Wide Plastic DIP
MAX235EDG -40°C to +85°C 24 Ceramic SB
MAX235MDG -55°C to +125°C 24 Ceramic SB
MAX236CNG 0°C to +70°C 24 Narrow Plastic DIP
MAX236CWG 0°C to +70°C 24 Wide SO
MAX236C/D 0°C to +70°C Dice*
MAX236ENG -40°C to +85°C 24 Narrow Plastic DIP
MAX236EWG -40°C to +85°C 24 Wide SO
MAX236ERG -40°C to +85°C 24 Narrow CERDIP
MAX236MRG -55°C to +125°C 24 Narrow CERDIP
MAX237CNG 0°C to +70°C 24 Narrow Plastic DIP
MAX237CWG 0°C to +70°C 24 Wide SO
MAX237C/D 0°C to +70°C Dice*
MAX237ENG -40°C to +85°C 24 Narrow Plastic DIP
MAX237EWG -40°C to +85°C 24 Wide SO
MAX237ERG -40°C to +85°C 24 Narrow CERDIP
MAX237MRG -55°C to +125°C 24 Narrow CERDIP
MAX238CNG 0°C to +70°C 24 Narrow Plastic DIP
MAX238CWG 0°C to +70°C 24 Wide SO
MAX238C/D 0°C to +70°C Dice*
MAX238ENG -40°C to +85°C 24 Narrow Plastic DIP
* Contact factory for dice specifications.
MAX220MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
___________________________________________Ordering Information (continued)
* Contact factory for dice specifications.
MAX242MJN -55°C to +125°C 18 CERDIP
MAX242EJN -40°C to +85°C 18 CERDIP
MAX242EWN -40°C to +85°C 18 Wide SO
MAX242EPN -40°C to +85°C 18 Plastic DIP
MAX242C/D 0°C to +70°C Dice*
MAX242CWN 0°C to +70°C 18 Wide SO
MAX242CPN 0°C to +70°C 18 Plastic DIP
MAX242CAP 0°C to +70°C 20 SSOP
MAX241EWI -40°C to +85°C 28 Wide SO
MAX241EAI -40°C to +85°C 28 SSOP
MAX241C/D 0°C to +70°C Dice*
MAX241CWI 0°C to +70°C 28 Wide SO
MAX241CAI 0°C to +70°C 28 SSOP
MAX240C/D 0°C to +70°C Dice*
MAX240CMH 0°C to +70°C 44 Plastic FP
MAX239MRG -55°C to +125°C 24 Narrow CERDIP
MAX239ERG -40°C to +85°C 24 Narrow CERDIP
MAX239EWG -40°C to +85°C 24 Wide SO
MAX239ENG -40°C to +85°C 24 Narrow Plastic DIP
MAX239C/D 0°C to +70°C Dice*
MAX239CWG 0°C to +70°C 24 Wide SO
MAX239CNG 0°C to +70°C 24 Narrow Plastic DIP
-55°C to +125°C 24 Narrow CERDIP
24 Wide SO
TEMP. RANGE PIN-PACKAGE
-40°C to +85°C
MAX238MRG
MAX238ERG -40°C to +85°C 24 Narrow CERDIP
MAX238EWG
PART
MAX249EQH -40°C to +85°C 44 PLCC
MAX249CQH 0°C to +70°C 44 PLCC
MAX248EQH -40°C to +85°C 44 PLCC
MAX248C/D 0°C to +70°C Dice*
MAX248CQH 0°C to +70°C 44 PLCC
MAX247EPL -40°C to +85°C 40 Plastic DIP
MAX247C/D 0°C to +70°C Dice*
MAX247CPL 0°C to +70°C 40 Plastic DIP
MAX246EPL -40°C to +85°C 40 Plastic DIP
MAX246C/D 0°C to +70°C Dice*
MAX246CPL 0°C to +70°C 40 Plastic DIP
MAX245EPL -40°C to +85°C 40 Plastic DIP
MAX245C/D 0°C to +70°C Dice*
MAX245CPL 0°C to +70°C 40 Plastic DIP
MAX244EQH -40°C to +85°C 44 PLCC
MAX244C/D 0°C to +70°C Dice*
MAX244CQH 0°C to +70°C 44 PLCC
MAX243MJE -55°C to +125°C 16 CERDIP
MAX243EJE -40°C to +85°C 16 CERDIP
MAX243EWE -40°C to +85°C 16 Wide SO
MAX243ESE -40°C to +85°C 16 Narrow SO
MAX243EPE -40°C to +85°C 16 Plastic DIP
MAX243C/D 0°C to +70°C Dice*
0°C to +70°C 16 Wide SO
0°C to +70°C 16 Plastic DIP
MAX243CWE
MAX243CSE 0°C to +70°C 16 Narrow SO
MAX243CPE
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
36 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600
© 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.MAX232CWE is the number for products that is related with integrated circuit.