TLH5711

February 1995

LP311 Voltage Comparator

General Description

The LP311 is a low power version of the industry-standard

LM311 It takes advantage of stable high-value ion-implant-

ed resistors to perform the same function as an LM311 with

a 301 reduction in power drain but only a 61 slowdown of

response time Thus the LP311 is well suited for battery-

powered applications and all other applications where fast

response is not needed It operates over a wide range of

supply voltages from 36V down to a single 3V supply with

less than 200 mA drain but it is still capable of driving a 25

mA load The LP311 is quite easy to apply without any oscil-

lation if ordinary precautions are taken to minimize stray

coupling from the output to either input or to the balance

pins (as described in the LM311 datasheet Application

Hints)

Features

Y

Low power drain 900 mW on 5V supply

Y

Y

Output can drive 25 mA

Y

Emitter output can swing below negative supply

Y

Response time 12 ms

Y

Same pin-out as LM311

Y

Low input currents 2 nA of offset 15 nA of bias

Y

Large common-mode input range

b

146V to 136V

Applications

Y

Level-detector for battery-powered instruments

Y

Low-power lamp or relay driver

Y

Low-power zero-crossing detector

Schematic Diagram

TLH5711 – 7

Connection Diagram

Dual-In-Line Package

TLH5711 – 4

Top View

Order Number LP311M or LP311N

See NS Package Numbers M08A or N08E

C1995 National Semiconductor Corporation

RRD-B30M115Printed in U S A