Lm301

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 5V supply used for
IC logic. Their output is compatiblewith 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. Offset balancing and strobe capability are
providedand outputs can be wire OR’ed. Although slower
than the LM106 and LM710 (200 ns response time vs 40 ns)

3.0 Typical Applications

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
instead of−55˚C to +125˚C. The LM311 has a temperature
range of 0˚C to +70˚C.

2.0 Features
n
n
n
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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

(Note 3)

Offset Balancing

Strobing

00570436

00570437

Note: Do Not Ground Strobe Pin.Output is turned off when current is
pulled from Strobe Pin.

Increasing Input Stage Current (Note 1)

Detector for Magnetic Transducer

00570438

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

00570439

© 2004 National Semiconductor Corporation

DS005704

www.national.com

LM111/LM211/LM311 Voltage Comparator

January 2001

LM111/LM211/LM311

3.0Typical Applications

(Note 3)

(Continued)

Digital Transmission Isolator

Relay Driver with Strobe

00570440

00570441

*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)

00570442

Note: Do Not Ground Strobe Pin.
Note 2: Typical input current is 50pA with inputs strobed off.
Note 3: Pin connections 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

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2

LM111

−55˚C to 125˚C

LM211

−25˚C to 85˚C

Lead Temperature (Soldering, 10 sec)

260˚C

Voltage at Strobe PinIf Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.

V+−5V

Soldering Information

Total Supply Voltage (V84)

36V

Dual-In-Line Package

Output to Negative Supply Voltage
(V74)

50V

Small Outline Package

Ground to Negative Supply Voltage
(V14)

30V

Soldering(10 seconds)

260˚C

Vapor Phase (60 seconds)

± 30V
± 15V

Differential Input Voltage
Input Voltage (Note 4)
Output Short Circuit Duration

215˚C

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.

10 sec

Operating Temperature Range

ESD Rating (Note 11)Electrical Characteristics

(Note 6)

Parameter

300V

for the LM111 and LM211

Conditions

Min

Typ

Max

Units

Input Offset Voltage (Note 7)

TA=25˚C, RS≤50k

0.7

3.0

mV

Input Offset Current

TA=25˚C

4.0

10

nA

Input Bias Current

TA=25˚C

60

100

nA

Voltage Gain

TA=25˚C

Response Time (Note 8)

TA=25˚C

200

Saturation...