TLF6136

February 1995

MM5450MM5451 LED Display Drivers

General Description

The MM5450 and MM5451 are monolithic MOS integrated

circuits utilizing N-channel metal-gate low threshold en-

hancement mode and ion-implanted depletion mode devic-

es They are available in 40-pin molded or cavity dual-in-line

packages The MM5450MM5451 is designed to drive com-

mon anode-separate cathode LED displays A single pin

controls the LED display brightness by setting a reference

Applications

Y

Y

Industrial control indicator

Y

Relay driver

Y

Digital clock thermometer counter voltmeter

Y

Instrumentation readouts

Features

Y

Continuous brightness control

Y

Serial data input

Y

No load signal required

Y

Enable (on MM5450)

Y

Wide power supply operation

Y

TTL compatibility

Y

34 or 35 outputs 15 mA sink capability

Y

Alphanumeric capability

Y

Block Diagram

TLF6136 – 1

FIGURE 1

C1995 National Semiconductor Corporation

RRD-B30M105Printed in U S A