M74HC646M1R View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

M74HC646M1R

HC648 OCTAL BUS TRANSCEIVER/REGISTER (3-STATE, INV.) HC646 OCTAL BUS TRANSCEIVER/REGISTER (3-STATE)

STMicroelectronics 

M74HC646/648

PIN DESCRIPTION

PIN No

1

2

3

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

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

21

22

23

12

24

SYMBOL

CLOCK AB

SELECT AB

GAB

A1 to A8

B1 to B8

G

SELECT BA

CLOCK BA

GND

VCC

IEC LOGIC SYMBOLS

HC646

NAME AND FUNCTION

A to B Clock Input (LOW to HIGH, Edge-Trigged)

Select A to B Source Input

Direction Control Input

A data Inputs/Outputs

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)

Ground (0V)

Positive Supply Voltage

HC648

4/12

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