TLF9399

November 1995

MM54HCT151MM74HCT151

8-Channel Digital Multiplexer

General Description

This high speed Digital multiplexer utilizes advanced silicon-

gate CMOS technology Along with the high noise immunity

and low power dissipation of standard CMOS integrated cir-

cuits it possesses the ability to drive 10 LS-TTL loads The

MM54HCT151MM74HCT151 selects one of the 8 data

sources depending on the address presented on the A B

and C inputs It features both true (Y) and complement (W)

outputs The STROBE input must be at a low logic level to

enable this multiplexer A high logic level at the STROBE

forces the W output high and the Y output low

MM54HCTMM74HCT devices are intended to interface be-

tween TTL and NMOS components and standard CMOS

devices These parts are also plug-in replacements for LS-

TTL devices and can be used to reduce power consumption

in existing designs

Features

Y

Typical propagation delay 20 ns

Y

Low quiescent supply current 40 mA maximum

(74HCT Series)

Y

Low input current 1 mA maximum

Y

Fanout of 10 LS-TTL loads

Y

TTL input compatible

Connection and Logic Diagrams

Dual-In-Line Package

TLF9399 – 1

Top View

Order Number MM54HCT151 or MM74HCT151

Truth Table

Inputs

Outputs

Select

Strobe

CBA

SY

W

XXX

H

L

H

L

L

L

L

D

D

L

L

H

L

D

D

L

H

L

L

D

D

L

H

H

L

D

D

H

L

L

L

D

D

H

L

H

L

D

D

H

H

L

L

D

D

H

H

H

L

D

D

TLF9399 – 2

C1995 National Semiconductor Corporation

RRD-B30M115Printed in U S A