ICeach Index

Position: Home > tech > LM393N Low Power Low Offset Voltage Dual Comparators

LM393N Low Power Low Offset Voltage Dual Comparators

Published:2011/5/10 9:58:00 |

LM193/LM293/LM393/LM2903
Low Power Low Offset Voltage Dual Comparators
General Description
The LM193 series consists of two independent precision
voltage comparators with an offset voltage specification as
low as 2.0 mV max for two comparators which were designed
specifically to operate from a single power supply
over a wide range of voltages. Operation from split power
supplies is also possible and the low power supply current
drain is independent of the magnitude of the power supply
voltage. These comparators also have a unique characteristic
in that the input common-mode voltage range includes
ground, even though operated from a single power supply
voltage.
Application areas include limit comparators, simple analog to
digital converters; pulse, squarewave and time delay generators;
wide range VCO; MOS clock timers; multivibrators
and high voltage digital logic gates. The LM193 series was
designed to directly interface with TTL and CMOS. When
operated from both plus and minus power supplies, the
LM193 series will directly interface with MOS logic where
their low power drain is a distinct advantage over standard
comparators.
The LM393 and LM2903 parts are available in National’s
innovative thin micro SMD package with 8 (12 mil) large
bumps.
Advantages
n High precision comparators
n Reduced VOS drift over temperature
n Eliminates need for dual supplies
n Allows sensing near ground
n Compatible with all forms of logic
n Power drain suitable for battery operation
Features
n Wide supply
— Voltage range: 2.0V to 36V
— Single or dual supplies: ±1.0V to ±18V
n Very low supply current drain (0.4 mA) — independent
of supply voltage
n Low input biasing current: 25 nA
n Low input offset current: ±5 nA
n Maximum offset voltage: ±3 mV
n Input common-mode voltage range includes ground
n Differential input voltage range equal to the power
supply voltage
n Low output saturation voltage,: 250 mV at 4 mA
n Output voltage compatible with TTL, DTL, ECL, MOS
and CMOS logic systems
n Available in the 8-Bump (12 mil) micro SMD package
n See AN-1112 for micro SMD considerations
Squarewave Oscillator Non-Inverting Comparator with Hysteresis
00570938
00570909
August 2002
LM193/LM293/LM393/LM2903 Low Power Low Offset Voltage Dual Comparators
© 2002 National Semiconductor Corporation DS005709 www.national.com
Schematic and Connection Diagrams
00570902
Metal Can Package Dual-In-Line/SOIC Package
00570903
00570901
micro SMD micro SMD Marking
00570945
Top View 00570946
Top View
LM193/LM293/LM393/LM2903
www.national.com 2
Absolute Maximum Ratings (Note 10)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage, V+ 36V
Differential Input Voltage (Note 8) 36V
Input Voltage −0.3V to +36V
Input Current (VIN<−0.3V) (Note 3) 50 mA
Power Dissipation (Note 1)
Molded DIP 780 mW
Metal Can 660 mW
Small Outline Package 510 mW
micro SMD Pacakge 568mW
Output Short-Circuit to Ground
(Note 2) Continuous
Operating Temperature Range
LM393 0°C to +70°C
LM293 −25°C to +85°C
LM193/LM193A −55°C to +125°C
LM2903 −40°C to +85°C
Storage Temperature Range −65°C to +150°C
Lead Temperature
(Soldering, 10 seconds) +260°C
Soldering Information
Dual-In-Line Package
Soldering (10 seconds) 260°C
Small Outline Package 215°C
Vapor Phase (60 seconds)
Infrared (15 seconds) 220°C
See AN-450 “Surface Mounting Methods and Their Effect
on Product Reliability” for other methods of soldering
surface mount devices.
ESD rating
(1.5 kΩ in series with 100 pF) 1300V
Electrical Characteristics
(V+=5V, TA = 25°C, unless otherwise stated)
Parameter Conditions LM193A Units
Min Typ Max
Input Offset Voltage (Note 9) 1.0 2.0 mV
Input Bias Current IIN(+) or IIN(−) with Output In Linear 25 100 nA
Range, VCM = 0V (Note 5)
Input Offset Current IIN(+)−IIN(−) VCM = 0V 3.0 25 nA
Input Common Mode V+ = 30V (Note 6) 0 V+−1.5 V
Voltage Range
Supply Current RL=∞ V+=5V 0.4 1 mA
V+=36V 1 2.5 mA
Voltage Gain RL≥15 kΩ, V+=15V 50 200 V/mV
VO = 1V to 11V
Large Signal Response VIN=TTL Logic Swing, VREF=1.4V 300 ns
Time VRL=5V, RL=5.1 kΩ
Response Time VRL=5V, RL=5.1 kΩ (Note 7) 1.3 μs
Output Sink Current VIN(−)=1V, VIN(+)=0, VO≈1.5V 6.0 16 mA
Saturation Voltage VIN(−)=1V, VIN(+)=0, ISINK≤4 mA 250 400 mV
Output Leakage Current VIN(−)=0, VIN(+)=1V, VO=5V 0.1 nA
Electrical Characteristics
(V+=5V, TA = 25°C, unless otherwise stated)
Parameter Conditions LM193 LM293, LM393 LM2903 Units
Min Typ Max Min Typ Max Min Typ Max
Input Offset Voltage (Note 9) 1.0 5.0 1.0 5.0 2.0 7.0 mV
Input Bias Current IIN(+) or IIN(−) with Output In 25 100 25 250 25 250 nA
Linear Range, VCM = 0V (Note 5)
Input Offset Current IIN(+)−IIN(−) VCM = 0V 3.0 25 5.0 50 5.0 50 nA
Input Common Mode V+ = 30V (Note 6) 0 V+−1.5 0 V+−1.5 0 V+−1.5 V
Voltage Range
LM193/LM293/LM393/LM2903
3 www.national.com
Electrical Characteristics (Continued)
(V+=5V, TA = 25°C, unless otherwise stated)
Parameter Conditions LM193 LM293, LM393 LM2903 Units
Min Typ Max Min Typ Max Min Typ Max
Supply Current RL=∞ V+=5V 0.4 1 0.4 1 0.4 1.0 mA
V+=36V 1 2.5 1 2.5 1 2.5 mA
Voltage Gain RL≥15 kΩ, V+=15V 50 200 50 200 25 100 V/mV
VO = 1V to 11V
Large Signal Response VIN=TTL Logic Swing, VREF=1.4V 300 300 300 ns
Time VRL=5V, RL=5.1 kΩ
Response Time VRL=5V, RL=5.1 kΩ (Note 7) 1.3 1.3 1.5 μs
Output Sink Current VIN(−)=1V, VIN(+)=0, VO≤1.5V 6.0 16 6.0 16 6.0 16 mA
Saturation Voltage VIN(−)=1V, VIN(+)=0, ISINK≤4 mA 250 400 250 400 250 400 mV
Output Leakage Current VIN(−)=0, VIN(+)=1V, VO=5V 0.1 0.1 0.1 nA
Electrical Characteristics
(V+ = 5V) (Note 4)
Parameter Conditions LM193A Units
Min Typ Max
Input Offset Voltage (Note 9) 4.0 mV
Input Offset Current IIN(+)−IIN(−), VCM=0V 100 nA
Input Bias Current IIN(+) or IIN(−) with Output in Linear Range, 300 nA
VCM=0V (Note 5)
Input Common Mode
Voltage Range
V+=30V (Note 6) 0 V+−2.0 V
Saturation Voltage VIN(−)=1V, VIN(+)=0, ISINK≤4 mA 700 mV
Output Leakage Current VIN(−)=0, VIN(+)=1V, VO=30V 1.0 μA
Differential Input Voltage Keep All VIN’s≥0V (or V−, if Used), (Note 8) 36 V
Electrical Characteristics
(V+ = 5V) (Note 4)
Parameter Conditions LM193 LM293, LM393 LM2903 Units
Min Typ Max Min Typ Max Min Typ Max
Input Offset Voltage (Note 9) 9 9 9 15 mV
Input Offset Current IIN(+)−IIN(−), VCM=0V 100 150 50 200 nA
Input Bias Current IIN(+) or IIN(−) with Output in
Linear Range, VCM=0V
(Note 5)
300 400 200 500 nA
Input Common Mode
Voltage Range
V+=30V (Note 6) 0 V+−2.0 0 V+−2.0 0 V+−2.0 V
Saturation Voltage VIN(−)=1V, VIN(+)=0,
ISINK≤4 mA
700 700 400 700 mV
Output Leakage Current VIN(−)=0, VIN(+)=1V, VO=30V 1.0 1.0 1.0 μA
Differential Input Voltage Keep All VIN’s≥0V (or V−, if
Used), (Note 8)
36 36 36 V
Note 1: For operating at high temperatures, the LM393 and LM2903 must be derated based on a 125°C maximum junction temperature and a thermal resistance
of 170°C/W which applies for the device soldered in a printed circuit board, operating in a still air ambient. The LM193/LM193A/LM293 must be derated based on
a 150°C maximum junction temperature. The low bias dissipation and the “ON-OFF” characteristic of the outputs keeps the chip dissipation very small (PD≤100 mW),
provided the output transistors are allowed to saturate.
Note 2: Short circuits from the output to V+ can cause excessive heating and eventual destruction. When considering short circuits to ground, the maximum output
current is approximately 20 mA independent of the magnitude of V+.
Note 3: This input current will only exist when the voltage at any of the input leads is driven negative. It is due to the collector-base junction of the input PNP
transistors becoming forward biased and thereby acting as input diode clamps. In addition to this diode action, there is also lateral NPN parasitic transistor action
LM193/LM293/LM393/LM2903
www.national.com 4
Electrical Characteristics (Continued)
on the IC chip. This transistor action can cause the output voltages of the comparators to go to the V+ voltage level (or to ground for a large overdrive) for the time
duration that an input is driven negative. This is not destructive and normal output states will re-establish when the input voltage, which was negative, again returns
to a value greater than −0.3V.
Note 4: These specifications are limited to −55°C≤TA≤+125°C, for the LM193/LM193A. With the LM293 all temperature specifications are limited to
−25°C≤TA≤+85°C and the LM393 temperature specifications are limited to 0°C≤TA≤+70°C. The LM2903 is limited to −40°C≤TA≤+85°C.
Note 5: The direction of the input current is out of the IC due to the PNP input stage. This current is essentially constant, independent of the state of the output so
no loading change exists on the reference or input lines.
Note 6: The input common-mode voltage or either input signal voltage should not be allowed to go negative by more than 0.3V. The upper end of the common-mode
voltage range is V+−1.5V at 25°C, but either or both inputs can go to 36V without damage, independent of the magnitude of V+.
Note 7: The response time specified is for a 100 mV input step with 5 mV overdrive. For larger overdrive signals 300 ns can be obtained, see typical performance
characteristics section.
Note 8: Positive excursions of input voltage may exceed the power supply level. As long as the other voltage remains within the common-mode range, the
comparator will provide a proper output state. The low input voltage state must not be less than −0.3V (or 0.3V below the magnitude of the negative power supply,
if used).
Note 9: At output switch point, VO.1.4V, RS=0Ω with V+ from 5V to 30V; and over the full input common-mode range (0V to V+−1.5V), at 25°C.
Note 10: Refer to RETS193AX for LM193AH military specifications and to RETS193X for LM193H military specifications.
Ordering Information
Package Temperature Range Part Number NSC Drawing
8-Pin Metal Can
−55°C to 125°C
LM193H*
H08C
LM193H/883
LM193H-MLS
LM193AH-MLS
LM193AH-QMLV**
LM193AH
LM193AH/883
−25°C to 85°C LM293H
0°C to 70°C LM393H
8-Pin Ceramic DIP −55°C to 125°C
LM193J/883*
J08A
LM193AJ/883
LM193AJ-QMLV**
LM193AJ-MLS
8-Pin Molded DIP
0°C to 70°C LM393N
N08E
−40°C to 85°C LM2903N
8-Pin SOIC
0°C to 70°C
LM393M
M08A
LM393MX
−40°C to 85°C
LM2903M
LM2903MX
8-Bump (12 mils)
micro SMD
0°C to 70°C
LM393TL
TLA08AAA
LM393TLX
−40°C to 85°C
LM2903ITL
LM2903ITLX
Note: * Also available per LM38510/11202
Note: ** See STD Mil DWG 5962-94526
LM193/LM293/LM393/LM2903
5 www.national.com
Typical Performance Characteristics LM193/LM293/LM393, LM193A
Supply Current Input Current
00570925 00570926
Output Saturation Voltage
Response Time for Various Input Overdrives—Negative
Transition
00570927 00570928
Response Time for Various Input Overdrives—Positive
Transition
00570929
LM193/LM293/LM393/LM2903
www.national.com 6
Typical Performance Characteristics LM2903
Supply Current Input Current
00570930
00570931
Output Saturation Voltage
Response Time for Various Input Overdrives—Negative
Transition
00570932
00570933
Response Time for Various Input Overdrives—Positive
Transition
00570934
LM193/LM293/LM393/LM2903
7 www.national.com
Application Hints
The LM193 series are high gain, wide bandwidth devices
which, like most comparators, can easily oscillate if the
output lead is inadvertently allowed to capacitively couple to
the inputs via stray capacitance. This shows up only during
the output voltage transition intervals as the comparator
change states. Power supply bypassing is not required to
solve this problem. Standard PC board layout is helpful as it
reduces stray input-output coupling. Reducing the input resistors
to < 10 kΩ reduces the feedback signal levels and
finally, adding even a small amount (1.0 to 10 mV) of positive
feedback (hysteresis) causes such a rapid transition that
oscillations due to stray feedback are not possible. Simply
socketing the IC and attaching resistors to the pins will cause
input-output oscillations during the small transition intervals
unless hysteresis is used. If the input signal is a pulse
waveform, with relatively fast rise and fall times, hysteresis is
not required.
All input pins of any unused comparators should be tied to
the negative supply.
The bias network of the LM193 series establishes a drain
current which is independent of the magnitude of the power
supply voltage over the range of from 2.0 VDC to 30 VDC.
It is usually unnecessary to use a bypass capacitor across
the power supply line.
The differential input voltage may be larger than V+ without
damaging the device (Note 8). Protection should be provided
to prevent the input voltages from going negative more than
−0.3 VDC (at 25°C). An input clamp diode can be used as
shown in the applications section.
The output of the LM193 series is the uncommitted collector
of a grounded-emitter NPN output transistor. Many collectors
can be tied together to provide an output OR’ing function. An
output pull-up resistor can be connected to any available
power supply voltage within the permitted supply voltage
range and there is no restriction on this voltage due to the
magnitude of the voltage which is applied to the V+ terminal
of the LM193 package. The output can also be used as a
simple SPST switch to ground (when a pull-up resistor is not
used). The amount of current which the output device can
sink is limited by the drive available (which is independent of
V+) and the β of this device. When the maximum current limit
is reached (approximately 16mA), the output transistor will
come out of saturation and the output voltage will rise very
rapidly. The output saturation voltage is limited by the approximately
60Ω rSAT of the output transistor. The low offset
voltage of the output transistor (1.0mV) allows the output to
clamp essentially to ground level for small load currents.
Typical Applications (V+=5.0 VDC)
Basic Comparator Driving CMOS Driving TTL
00570935
00570936
00570937
Squarewave Oscillator Pulse Generator Crystal Controlled Oscillator
00570938
00570939
* For large ratios of R1/R2,
D1 can be omitted.
00570940
LM193/LM293/LM393/LM2903
www.national.com 8
Typical Applications (V+=5.0 VDC) (Continued)
Two-Decade High Frequency VCO
00570941
V* = +30 VDC
+250 mVDC ≤ VC ≤ +50 VDC
700Hz ≤ fo ≤ 100kHz
Basic Comparator Non-Inverting Comparator with Hysteresis
00570906
00570909
Inverting Comparator with Hysteresis Output Strobing
00570910
00570911
LM193/LM293/LM393/LM2903
9 www.national.com
Typical Applications (V+=5.0 VDC) (Continued)
AND Gate OR Gate
00570912
00570913
Large Fan-in AND Gate Limit Comparator
00570914
00570915
Comparing Input Voltages of Opposite Polarity ORing the Outputs
00570916
00570917
LM193/LM293/LM393/LM2903
www.national.com 10
Typical Applications (V+=5.0 VDC) (Continued)
Zero Crossing Detector (Single Power Supply) One-Shot Multivibrator
00570921 00570922
Bi-Stable Multivibrator One-Shot Multivibrator with Input Lock Out
00570924
00570923
Zero Crossing Detector Comparator With a Negative Reference
00570943
00570944
LM193/LM293/LM393/LM2903
11 www.national.com
Typical Applications (V+=5.0 VDC) (Continued)
Time Delay Generator
00570907
Split-Supply Applications (V+=+15 VDC and V−=−15 VDC)
MOS Clock Driver
00570942
LM193/LM293/LM393/LM2903
www.national.com 12
Physical Dimensions inches (millimeters) unless otherwise noted
Metal Can Package (H)
NS Package Number H08C
Ceramic Dual-In-Line Package
NS Package Number J08A
LM193/LM293/LM393/LM2903
13 www.national.com
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
SOIC Package
NS Package Number M08A
Molded Dual-In-Line Package (N)
NS Package N08E
LM193/LM293/LM393/LM2903
www.national.com 14
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
NOTE: UNLESS OTHERWISE SPECIFIED
1. EPOXY COATING
2. 63Sn/37Pb EUTECTIC BUMP
3. RECOMMEND NON-SOLDER MASK DEFINED LANDING PAD.
4. PIN A1 IS ESTABLISHED BY LOWER LEFT CORNER WITH RESPECT TO TEXT ORIENTATION REMAINING PINS ARE NUMBERED
COUNTERCLOCKWISE.
5. XXX IN DRAWING NUMBER REPRESENTS PACKAGE SIZE VARIATION WHERE X1 IS PACKAGE WIDTH, X2 IS PACKAGE LENGTH AND X3 IS
PACKAGE HEIGHT.
6. REFERENCE JEDEC REGISTRATION MO-211, VARIATION BC.
8-Bump (12 mil) micro SMD Package
NS Package TLA08AAA
X1 = 1.514mm X2 = 1.514mm X3 = 0.600mm
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.
2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.
National Semiconductor
Corporation
Americas
Email: support@nsc.com
National Semiconductor
Europe
Fax: +49 (0) 180-530 85 86
Email: europe.support@nsc.com
Deutsch Tel: +49 (0) 69 9508 6208
English Tel: +44 (0) 870 24 0 2171
Français Tel: +33 (0) 1 41 91 8790
National Semiconductor
Asia Pacific Customer
Response Group
Tel: 65-2544466
Fax: 65-2504466
Email: ap.support@nsc.com
National Semiconductor
Japan Ltd.
Tel: 81-3-5639-7560
Fax: 81-3-5639-7507
www.national.com
LM193/LM293/LM393/LM2903 Low Power Low Offset Voltage Dual Comparators
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.LM393N is the number for products that is related with integrated circuit.