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LM111/LM211/LM311 Voltage Comparator

January 2001

LM111/LM211/LM311 Voltage Comparator
1.0 General Description
The LM111, LM211 and LM311 are voltage comparators that have input currents nearly a thousand times lower than devices like the LM106 or LM710. They are also designed to operate over a wider range of supply voltages: from standard ± 15V op amp supplies down to the single 5Vsupply used for IC logic. Their output is compatible with RTL, DTL and TTL as well as MOS circuits. Further, they can drive lamps or relays, switching voltages up to 50V at currents as high as 50 mA. Both the inputs and the outputs of the LM111, LM211 or the LM311 can be isolated from system ground, and the output can drive loads referred to ground, the positive supply or the negative supply. Offsetbalancing and strobe capability are provided and outputs can be wire OR’ed. Although slower than the LM106 and LM710 (200 ns response time vs 40 ns) the devices are also much less prone to spurious oscillations. The LM111 has the same pin configuration as the LM106 and LM710. The LM211 is identical to the LM111, except that its performance is specified over a −25˚C to +85˚C temperature range insteadof −55˚C to +125˚C. The LM311 has a temperature range of 0˚C to +70˚C.

2.0 Features
n n n n n Operates from single 5V supply Input current: 150 nA max. over temperature Offset current: 20 nA max. over temperature Differential input voltage range: ± 30V Power consumption: 135 mW at ± 15V

3.0 Typical Applications
Offset Balancing

(Note 3) Strobing



Note: Do NotGround Strobe Pin. Output is turned off when current is pulled from Strobe Pin.

Increasing Input Stage Current (Note 1)

Detector for Magnetic Transducer


Note 1: Increases typical common mode slew from 7.0V/µs to 18V/µs.


© 2004 National Semiconductor Corporation




3.0 Typical Applications

(Note 3)(Continued) Relay Driver with Strobe

Digital Transmission Isolator



*Absorbs inductive kickback of relay and protects IC from severe voltage transients on V++ line. Note: Do Not Ground Strobe Pin.

Strobing off Both Input and Output Stages (Note 2)


Note: Do Not Ground Strobe Pin. Note 2: Typical input current is 50 pA with inputs strobed off. Note 3: Pinconnections shown on schematic diagram and typical applications are for H08 metal can package.

Positive Peak Detector

Zero Crossing Detector Driving MOS Logic

00570424 00570423

*Solid tantalum




4.0 Absolute Maximum Ratings for the LM111/LM211(Note 10)
If Military/Aerospace specified devices are required, please contact the NationalSemiconductor Sales Office/ Distributors for availability and specifications. Total Supply Voltage (V84) Output to Negative Supply Voltage (V74) Ground to Negative Supply Voltage (V14) Differential Input Voltage Input Voltage (Note 4) Output Short Circuit Duration Operating Temperature Range 36V 50V 30V

LM111 LM211 Lead Temperature (Soldering, 10 sec) Voltage at Strobe Pin Soldering InformationDual-In-Line Package Soldering (10 seconds) Small Outline Package Vapor Phase (60 seconds) Infrared (15 seconds)

−55˚C to 125˚C −25˚C to 85˚C 260˚C V+−5V

260˚C 215˚C 220˚C

± 30V ± 15V
10 sec

See AN-450 “Surface Mounting Methods and Their Effect on Product Reliability” for other methods of soldering surface mount devices. ESD Rating (Note 11) 300V

Electrical Characteristics
ParameterInput Offset Voltage (Note 7) Input Offset Current Input Bias Current Voltage Gain Response Time (Note 8) Saturation Voltage Strobe ON Current (Note 9) Output Leakage Current Input Offset Voltage (Note 7) Input Offset Current (Note 7) Input Bias Current Input Voltage Range Saturation Voltage Output Leakage Current Positive Supply Current Negative Supply Current

(Note 6)

for the LM111 and...
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