LM2903EP
LM2903EP Low Power Low Offset Voltage Dual Comparators
Literature Number: SNOSAF8B
LM2903EP
OBSOLETE
September 29, 2009
Low Power Low Offset Voltage Dual Comparators
General Description
The LM2903EP consists of two independent precision volt-
age 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 indepen-
dent of the magnitude of the power supply voltage. This
comparator also has 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 gener-
ators; wide range VCO; MOS clock timers; multivibrators and
high voltage digital logic gates. The LM2903EP was designed
to directly interface with TTL and CMOS. When operated from
both plus and minus power supplies, the LM2903EP will di-
rectly interface with MOS logic where their low power drain is
a distinct advantage over standard comparators.
ENHANCED PLASTIC
•Extended Temperature Performance of −40°C to +85°C
•Baseline Control - Single Fab & Assembly Site
•Process Change Notification (PCN)
•Qualification & Reliability Data
•Solder (PbSn) Lead Finish is standard
•Enhanced Diminishing Manufacturing Sources (DMS)
Support
Advantages
■High precision comparators
■Reduced VOS drift over temperature
■Eliminates need for dual supplies
■Allows sensing near ground
■Compatible with all forms of logic
■Power drain suitable for battery operation
Features
■Wide supply
—Voltage range: 2.0V to 36V
—Single or dual supplies: ±1.0V to ±18V
■Very low supply current drain (0.4 mA) — independent of
supply voltage
■Low input biasing current: 25 nA
■Low input offset current: ±5 nA
■Maximum offset voltage: ±3 mV
■Input common-mode voltage range includes ground
■Differential input voltage range equal to the power supply
voltage
■Low output saturation voltage,: 250 mV at 4 mA
■Output voltage compatible with TTL, DTL, ECL, MOS and
CMOS logic systems
Applications
■Selected Military Applications
■Selected Avionics Applications
Ordering Information
PART NUMBER VID PART NUMBER NS PACKAGE NUMBER (Note 3)
LM2903MEP V62/04745-01 M08A
(Note 1, Note 2) TBD TBD
Note 1: For the following (Enhanced Plastic) version, check for availability: - LM2903MXEP, LM2903NEP, LM2903ITLEP, LM2903ITLXEP. Parts
listed with an "X" are provided in Tape & Reel and parts without an "X" are in Rails.
Note 2: FOR ADDITIONAL ORDERING AND PRODUCT INFORMATION, PLEASE VISIT THE ENHANCED PLASTIC WEB SITE AT: www.national.com/
mil
Note 3: Refer to package details under Physical Dimensions
© 2009 National Semiconductor Corporation 201141 www.national.com
201141 Version 3 Revision 1 Print Date/Time: 2009/09/29 16:01:39
LM2903EP Low Power Low Offset Voltage Dual Comparators
Schematic and Connection Diagrams
20114102
Dual-In-Line/SOIC Package
20114101
micro SMD
20114145
Top View
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LM2903EP
Absolute Maximum Ratings (Note 14)
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 12) 36V
Input Voltage −0.3V to +36V
Input Current (VIN<−0.3V) (Note 7) 50 mA
Power Dissipation (Note 4)
Molded DIP 780 mW
Small Outline Package 510 mW
Output Short-Circuit to Ground
(Note 6)Continuous
Operating Temperature Range −40°C to +85°C
Storage Temperature Range −65°C to +150°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
ESD rating
(1.5 kΩ in series with 100 pF) 1300V
Electrical Characteristics (Note 5)
(V+=5V, TA = 25°C, unless otherwise stated)
Parameter Conditions LM2903 Units
Min Typ Max
Input Offset Voltage (Note 13) 2.0 7.0 mV
Input Bias Current IIN(+) or IIN(−) with Output In 25 250 nA
Linear Range, VCM = 0V (Note 9)
Input Offset Current IIN(+)−IIN(−) VCM = 0V 5.0 50 nA
Input Common Mode V+ = 30V (Note 10) 0 V+−1.5 V
Voltage Range
Supply Current RL=∞V+=5V 0.4 1.0 mA
V+=36V 1 2.5 mA
Voltage Gain RL≥15 kΩ, V+=15V 25 100 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 11) 1.5 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 (Note 4, Note 5)
(V+ = 5V)
Parameter Conditions LM2903 Units
Min Typ Max
Input Offset Voltage (Note 13) 9 15 mV
Input Offset Current IIN(+)−IIN(−), VCM=0V 50 200 nA
Input Bias Current IIN(+) or IIN(−) with Output in Linear Range,
VCM=0V
(Note 9)
200 500 nA
Input Common Mode Voltage Range V+=30V (Note 10) 0 V+−2.0 V
Saturation Voltage VIN(−)=1V, VIN(+)=0,
ISINK≤4 mA
400 700 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 12) 36 V
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LM2903EP
Note 4: For operating at high temperatures, the LM2903EP 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 low bias dissipation and the “ON-OFF” characteristic of
the outputs keeps the chip dissipation very small (PD≤100 mW), provided that the output transistors are allowed to saturate.
Note 5: "Testing and other quality control techniques are used to the extent deemed necessary to ensure product performance over the specified temperature
range. Product may not necessarily be tested across the full temperature range and all parameters may not necessarily be tested. In the absence of specific
PARAMETRIC testing, product performance is assured by characterization and/or design."
Note 6: 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 7: 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
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 8: These specifications are limited to −40°C≤TA≤+85°C.
Note 9: 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 10: 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 11: 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 12: 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 13: 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 14: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.
Note 15: The LM193 within this data sheet's graphics is referenced because of it's a similarity to the LM2903, however is not offered in this data sheet.
Typical Performance Characteristics
Supply Current
20114130
Input Current
20114131
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LM2903EP
Output Saturation Voltage
20114132
Response Time for Various Input Overdrives—Negative
Transition
20114133
Response Time for Various Input Overdrives—Positive
Transition
20114134
Application Hints
The LM2903EP is a high gain, wide bandwidth device 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 volt-
age 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 at-
taching resistors to the pins will cause input-output oscilla-
tions 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 LM2903EP establishes a drain cur-
rent 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 12). Protection should be provid-
ed 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 LM2903EP 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 LM2903EP 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 ap-
proximately 60Ω rSAT of the output transistor. The low offset
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LM2903EP
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) (Note 15)
Basic Comparator
20114135
Driving CMOS
20114136
Driving TTL
20114137
Squarewave Oscillator
20114138
Pulse Generator
20114139
* For large ratios of R1/R2,
D1 can be omitted.
Crystal Controlled Oscillator
20114140
Two-Decade High Frequency VCO
20114141
V* = +30 VDC
+250 mVDC ≤ VC ≤ +50 VDC
700Hz ≤ fo ≤ 100kHz
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LM2903EP
Basic Comparator
20114106
Non-Inverting Comparator with Hysteresis
20114109
Inverting Comparator with Hysteresis
20114110
Output Strobing
20114111
AND Gate
20114112
OR Gate
20114113
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LM2903EP
Large Fan-in AND Gate
20114114
Limit Comparator
20114115
Comparing Input Voltages of Opposite Polarity
20114116
ORing the Outputs
20114117
Zero Crossing Detector (Single Power Supply)
20114121
One-Shot Multivibrator
20114122
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LM2903EP
Bi-Stable Multivibrator
20114124
One-Shot Multivibrator with Input Lock Out
20114123
Zero Crossing Detector
20114143
Comparator With a Negative Reference
20114144
Time Delay Generator
20114107
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LM2903EP
Split-Supply Applications
(V+=+15 VDC and V−=−15 VDC)
MOS Clock Driver
20114142
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LM2903EP
Physical Dimensions inches (millimeters) unless otherwise noted
SOIC Package
NS Package Number M08A
Molded Dual-In-Line Package (N)
NS Package N08E
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LM2903EP
8–Bump (12 mil) micro SMD Package
NS Package TLA08AAA
X1 = 1,514mm X2 = 1.514mm X3 = 0.600mm
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LM2903EP
Notes
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LM2903EP
Notes
LM2903EP Low Power Low Offset Voltage Dual Comparators
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