HD74HC242/HD74HC243

Quad. Bus Transceivers (with 3-state outputs)

Quad. Bus Transceivers (with noninverted 3-state outputs)

ADE-205-473 (Z)

1st. Edition

Sep. 2000

Description

The HD74HC242 is an inverting buffer and the HD74HC243 is a noninverting buffer. Each device has one

active high enable (GBA), and one active low enable (

GAB). GBA enables the A output and GAB enables

the B outputs. The device does not have schmitt trigger inputs.

Features

• High Speed Operation: t

• High Output Current: Fanout of 15 LSTTL Loads

• Wide Operating Voltage: V

• Low Input Current: 1 µA max

• Low Quiescent Supply Current: I

Function Table

HD74HC242

HC74HC243

Control inputs

Data Port Status

Data Port Status

GAB

GBA

A

B

A

B

HH

O

IO

I

L

H

Z

ZZZ

H

L

Z

ZZZ

LL

I

O

IO

I

:

Input

O :

Output

O :

Inverting Output

Z

:

Hight Impedance