HC646 datasheet(3/12 Pages) PHILIPS

Part #	HC646

Description	Octal bus transceiver/register; 3-state

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Manufacturer	PHILIPS [NXP Semiconductors]

Direct Link	http://www.nxp.com

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3 / 12 page

September 1993

3

Philips Semiconductors

Product speciﬁcation

Octal bus transceiver/register; 3-state

74HC/HCT646

PIN DESCRIPTION

PIN NO.

SYMBOL

NAME AND FUNCTION

1CPAB

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

2SAB

select A to B source input

3

DIR

direction control input

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

A0 to A7

A data inputs/outputs

12

GND

ground (0 V)

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

B0 to B7

B data inputs/outputs

21

OE

output enable input (active LOW)

22

SBA

select B to A source input

23

CPBA

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

24

VCC

positive supply voltage

Fig.1 Pin configuration.

Fig.2 Logic symbol.

Fig.3 IEC logic symbol.

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