M74HC243 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

M74HC243

QUAD BUS TRANSCEIVER (3-STATE)

STMicroelectronics 

M54/M74HC242/243

CHIP CARRIER

TRUTH TABLE

INPUTS

GAB GBA

H

H

L

L

H

L

L

H

FUNCTION

OUTPUTS

A BUS B BUS HC242 HC243

OUTPUT INPUT A = B A = B

INPUT OUTPUT B = A B = A

HIGH IMPEDANCE Z

Z

HIGH IMPEDANCE Z

Z

PIN DESCRIPTION

PIN No

1

2, 12

3, 4, 5, 6

11, 10, 9, 8

13

7

14

SYMBOL

GAB

NC

1A to 4A

1B to 4B

GBA

GND

VCC

NAME AND FUNCTION

Output Enable Input

(active LOW)

Not connected

Data Inputs/Outputs

Data Inputs/Outputs

Output Enable Input

Ground (0V)

Positive Supply Voltage

IEC LOGIC SYMBOLS

HC242

HC243

2/11

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