BAL/STRB BALANCE

IN+

IN−

450 Ω

450 Ω

2.4

kΩ

1.2 kΩ

70 Ω

2.4

kΩ

1.2 kΩ

60 Ω

400 Ω

450 Ω

2 kΩ

200 Ω

250 Ω

600 Ω

130 Ω

4 Ω

4 kΩ

EMIT OUT

COL OUT

750 Ω

600 Ω

Component Count

Resistors

20

Diodes

2

EPI FET

1

Transistors

22

LM111, LM211, LM311

SLCS007I – SEPTEMBER 1973 – REVISED JUNE 2015

www.ti.com

8 Detailed Description

8.1 Overview

The LM111, LM211 and LM311 are voltage comparators that have input currents nearly a thousand times lower

than legacy standard devices. They are also designed to operate over a wider range of supply voltages: from

standard ±15V op amp supplies down to the single 5-V 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 relays, switching voltages up to 50

V 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 ORed. 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.

8.2 Functional Block Diagram

8.3 Feature Description

external offset adjustment or trimming.

The input stage is followed by a very high gain stage for very fast response after a voltage difference on the input

pins have been sensed.

10

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Product Folder Links: LM111 LM211 LM311