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M74HCT643

OCTAL BUS TRANSCEIVER WITH 3 STATE OUTPUTS (INVERTED/NON INVERTED)

STMicroelectronics 

M74HCT643

INPUT AND OUTPUT EQUIVALENT CIRCUIT

PIN DESCRIPTION

PIN No

1

2, 3, 4, 5, 6,

7, 8, 9

18, 17, 16,

15, 14, 13,

12, 11

19

10

20

SYMBOL

DIR

A1 to A8

NAME AND FUNCTION

Directional Control

Data Inputs/Outputs

B1 to B8 Data Inputs/Outputs

G

GND

VCC

Output Enable Input

Ground (0V)

Positive Supply Voltage

TRUTH TABLE

INPUTS

G

DIR

L

L

L

H

H

X

X : Don’t Care

Z : High Impedance

LOGIC DIAGRAM

FUNCTION

A BUS

OUTPUT

INPUT

Z

B BUS

INPUT

OUTPUT

Z

OUTPUT

A=B

B=A

Z

This logic diagram has not be used to estimate propagation delays

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