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National Semiconductor Electronic Components Datasheet

LM311 Datasheet

Voltage Comparator

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May 1999
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 de-
vices 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 5V supply used for
IC logic. Their output is compatible with RTL, DTL and TTL
as well as MOS circuits. Further, they can drive lamps or re-
lays, 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. Offset balancing 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 oscilla-
tions. The LM111 has the same pin configuration as the
LM106 and LM710.
The LM211 is identical to the LM111, except that its perfor-
mance is specified over a −25˚C to +85˚C temperature range
instead of −55˚C to +125˚C. The LM311 has a temperature
range of 0˚C to +70˚C.
2.0 Features
n Operates from single 5V supply
n Input current: 150 nA max. over temperature
n Offset current: 20 nA max. over temperature
n Differential input voltage range: ±30V
n Power consumption: 135 mW at ±15V
3.0 Typical Applications (Note 3)
Offset Balancing
Strobing
DS005704-36
Increasing Input Stage Current (Note 1)
DS005704-37
Note: Do Not Ground Strobe Pin. Output is turned off when current is
pulled from Strobe Pin.
Detector for Magnetic Transducer
DS005704-38
Note 1: Increases typical common mode slew from 7.0V/µs to 18V/µs.
DS005704-39
© 1999 National Semiconductor Corporation DS005704
www.national.com


National Semiconductor Electronic Components Datasheet

LM311 Datasheet

Voltage Comparator

No Preview Available !

3.0 Typical Applications (Note 3) (Continued)
Digital Transmission Isolator
Relay Driver with Strobe
DS005704-40
DS005704-41
*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)
DS005704-42
Note: Do Not Ground Strobe Pin.
Note 2: Typical input current is 50 pA with inputs strobed off.
Note 3: Pin connections shown on schematic diagram and typical applications are for H08 metal can package.
www.national.com
2


Part Number LM311
Description Voltage Comparator
Maker National Semiconductor
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LM311 Datasheet PDF





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