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74HC646

Octal bus transceiver/register; 3-state

Philips Electronics 

Philips Semiconductors

Octal bus transceiver/register; 3-state

Product specification

74HC/HCT646

PIN DESCRIPTION

PIN NO.

1

2

3

4, 5, 6, 7, 8, 9, 10, 11

12

20, 19, 18, 17, 16, 15, 14, 13

21

22

23

24

SYMBOL

CPAB

SAB

DIR

A0 to A7

GND

B0 to B7

OE

SBA

CPBA

VCC

NAME AND FUNCTION

A to B clock input (LOW-to-HIGH, edge-triggered)

select A to B source input

direction control input

A data inputs/outputs

ground (0 V)

B data inputs/outputs

output enable input (active LOW)

select B to A source input

B to A clock input (LOW-to-HIGH, edge-triggered)

positive supply voltage

Fig.1 Pin configuration.

Fig.2 Logic symbol.

Fig.3 IEC logic symbol.

September 1993

3

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