LM2901EP
LM2901EP Low Power Low Offset Voltage Quad Comparators
Literature Number: SNOSAF6A
LM2901EP
OBSOLETE
March 29, 2011
Low Power Low Offset Voltage Quad Comparators
General Description
The LM2901EP consists of four independent precision volt-
age comparators with an offset voltage specification as low
as 2 mV max for all four comparators. These 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 LM2901EP was designed
to directly interface with TTL and CMOS. When operated from
both plus and minus power supplies, it will directly interface
with MOS logic— where the low power drain of the LM2901EP
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
Features
■Wide supply voltage range
■LM2901: 2 to 36 VDC
or ±1 to ±18 VDC
■Very low supply current drain (0.8 mA) — independent of
supply voltage
■Low input biasing current: 25 nA
■Low input offset current: ±5 nA
■Offset voltage: ±3 mV
■Input common-mode voltage range includes GND
■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
Advantages
■High precision comparator
■Reduced VOS drift over temperature
■Eliminates need for dual supplies
■Allows sensing near GND
■Compatible with all forms of logic
■Power drain suitable for battery operation
Applications
■Selected Military Applications
■Selected Avionics Applications
Ordering Information
PART NUMBER VID PART NUMBER NS PACKAGE NUMBER (Note 3)
LM2901MEP V62/04743-01 M14A
(Note 1, Note 2) TBD TBD
Note 1: For the following (Enhanced Plastic) version, check for availability: - LM2901MXEP, LM2901NEP. 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
© 2011 National Semiconductor Corporation 201139 www.national.com
201139 Version 2 Revision 2 Print Date/Time: 2011/03/29 21:52:09
LM2901EP Low Power Low Offset Voltage Quad Comparators
One-Shot Multivibrator with Input
Lock Out
20113912
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201139 Version 2 Revision 2 Print Date/Time: 2011/03/29 21:52:09
LM2901EP
Absolute Maximum Ratings (Note 4)
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors
for availability and specifications.
Supply Voltage, V+36 VDC or ±18 VDC
Differential Input Voltage (Note 12) 36 VDC
Input Voltage −0.3 VDC to +36 VDC
Input Current (VIN<−0.3 VDC),
(Note 7)50 mA
Power Dissipation (Note 5)
Molded DIP 1050 mW
Small Outline Package 760 mW
Output Short-Circuit to GND,
(Note 6)Continuous
Storage Temperature Range −65°C to +150°C
Lead Temperature
(Soldering, 10 seconds) 260°C
Operating Temperature Range
LM2901 −40°C to +85°C
Soldering Information
Dual-In-Line Package
Soldering (10 seconds) 260°C
Small Outline Package
Vapor Phase (60 seconds) 215°C
Infrared (15 seconds) 220°C
ESD rating (1.5 kΩ in series with 100 pF) 600V
Electrical Characteristics (Note 14)
(V+ = 5 VDC, TA = 25°C, unless otherwise stated)
Parameter Conditions LM2901 Units
Min Typ Max
Input Offset Voltage (Note 13) 2.0 7.0 mVDC
Input Bias Current IIN(+) or IIN(−) with Output in 25 250 nADC
Linear Range, (Note 9), VCM=0V
Input Offset Current IIN(+)−IIN(−), VCM = 0V 5 50 nADC
Input Common-Mode V+ = 30 VDC 0 V+−1.5 VDC
Voltage Range (Note 10)
Supply Current RL = ∞ on all Comparators, 0.8 2.0 mADC
RL = ∞, V+ = 36V, 1.0 2.5 mADC
Voltage Gain RL ≥ 15 kΩ, V+ = 15 VDC 25 100 V/mV
VO = 1 VDC to 11 VDC
Large Signal VIN = TTL Logic Swing, VREF = 300 ns
Response Time 1.4 VDC, VRL = 5 VDC,
RL = 5.1 kΩ,
Response Time VRL = 5 VDC, RL = 5.1 kΩ, 1.3 μs
(Note 11)
Output Sink Current VIN(−)= 1 VDC, VIN(+) = 0, 6.0 16 mADC
VO ≤ 1.5 VDC
Saturation Voltage VIN(−) = 1 VDC, VIN(+) = 0, 250 400 mVDC
ISINK ≤ 4 mA
Output Leakage VIN(+) = 1 VDC,VIN(−) = 0, 0.1 nADC
Current VO = 5 VDC
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LM2901EP
Electrical Characteristics (Note 14)
(V+ = 5.0 VDC) (Note 8)
Parameter Conditions LM2901 Units
Min Typ Max
Input Offset Voltage (Note 13) 9 15 mVDC
Input Offset Current IIN(+)−IIN(−), VCM = 0V 50 200 nADC
Input Bias Current IIN(+) or IIN(−) with Output in 200 500 nADC
Linear Range, VCM = 0V (Note 9)
Input Common-Mode V+ = 30 VDC 0 V+−2.0 VDC
Voltage Range (Note 10)
Saturation Voltage VIN(−) = 1 VDC, VIN(+) = 0, 400 700 mVDC
ISINK ≤ 4 mA
Output Leakage Current VIN(+) = 1 VDC, VIN(−) = 0, 1.0 μADC
VO = 30 VDC
Differential Input Voltage Keep all VIN's ≥ 0 VDC (or V−, 36 VDC
if used), (Note 12)
Note 4: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.
Note 5: For operating at high temperatures, the LM2901EP must be derated based on a 125°C maximum junction temperature and a thermal resistance of 95°
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 the output transistors are allowed to saturate.
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 −0.3 VDC (at 25°)C.
Note 8: These specifications are limited to −40°C ≤ TA ≤ +85°C, for the LM2901EP.
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 +30 VDC without damage independent of the magnitude of V+.
Note 11: The response time specified is 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 −0.3 VDC (or 0.3 VDCbelow the magnitude of the negative power
supply, if used) (at 25°C).
Note 13: At output switch point, VO≃1.4 VDC, RS = 0Ω with V+ from 5 VDC to 30 VDC; and over the full input common-mode range (0 VDC to V+ −1.5 VDC), at 25°C.
Note 14: "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 15: The LM139 within this data sheet's graphics is referenced because of it's a similarity to the LM2901, however is not offered in this data sheet.
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LM2901EP
Typical Performance Characteristics
Supply Current
20113939
Input Current
20113940
Output Saturation Voltage
20113941
Response Time for Various Input Overdrives
—Negative Transition
20113942
Response Time for Various Input Overdrives
—Positive Transition
20113943
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LM2901EP
Application Hints
The LM2901EP 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 changes 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 this input resistors to < 10 kΩ
reduces the feedback signal levels and finally, adding even a
small amount (1 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 pins of any unused comparators should be tied to the neg-
ative supply.
The bias network of the LM2901EP series establishes a drain
current which is independent of the magnitude of the power
supply voltage over the range of from 2 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. Protection should be provided to pre-
vent 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 LM2901EP 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 LM2901EP 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 16 mA), 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
voltage of the output transistor (1 mV) allows the output to
clamp essentially to ground level for small load currents.
Typical Applications
(V+ = 5.0 VDC) (Note 15)
Basic Comparator
20113903
Driving CMOS
20113904
Driving TTL
20113905
AND Gate
20113908
OR Gate
20113909
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LM2901EP
One-Shot Multivibrator with Input Lock Out
20113912
Pulse Generator
20113917
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LM2901EP
Large Fan-In AND Gate
20113913
ORing the Outputs
20113915
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LM2901EP
Time Delay Generator
20113914
Non-Inverting Comparator with Hysteresis
20113918
Inverting Comparator with Hysteresis
20113919
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LM2901EP
Squarewave Oscillator
20113916
Basic Comparator
20113921
Limit Comparator
20113924
Comparing Input Voltages
of Opposite Polarity
20113920
Output Strobing
20113922
* Or open-collector logic gate without pull-up resistor
Crystal Controlled Oscillator
20113925
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LM2901EP
Two-Decade High-Frequency VCO
20113923
V+ = +30 VDC
250 mVDC ≤ VC ≤ +50 VDC
700 Hz ≤ fO ≤ 100 kHz
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LM2901EP
Transducer Amplifier
20113928
Zero Crossing Detector (Single Power Supply)
20113930
Split-Supply Applications
(V+ = +15 VDC and V− = −15 VDC)
MOS Clock Driver
20113931
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LM2901EP
Zero Crossing Detector
20113932
Comparator With a Negative Reference
20113933
Schematic Diagram
20113901
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LM2901EP
Connection Diagrams
Dual-In-Line Package
20113902
See NS Package Number M14A and N14A
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LM2901EP
Physical Dimensions inches (millimeters) unless otherwise noted
S.O. Package (M)
NS Package Number M14A
Molded Dual-In-Line Package (N)
NS Package Number N14A
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LM2901EP
Notes
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LM2901EP
Notes
LM2901EP Low Power Low Offset Voltage Quad Comparators
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