Rev.2.00 Mar 30, 2006 page 1 of 10

HD74HC640, HD74HC643

Octal Bus Transceivers (with 3-state outputs)

REJ03D0637-0200

(Previous ADE-205-517)

Rev.2.00

Mar 30, 2006

Description

Each device has an active enable

G and a direction control input, DIR. When DIR is high, data flows from the A inputs

to the B outputs. When DIR is low, data flows from the B inputs to the A outputs. The HD74HC640 transfers inverted

data from one bus to other and the HD74HC643 transfers inverted data from the A bus to the B bus and true data from

the B bus to the A bus.

Features

• High Speed Operation: t

• High Output Current: Fanout of 15 LSTTL Loads

• Wide Operating Voltage: V

• Low Input Current: 1 µA max

• Low Quiescent Supply Current: I

• Ordering Information

Part Name

Package Type

Package Code

(Previous Code)

Package

Abbreviation

Taping Abbreviation

(Quantity)

HD74HC640P

DILP-20 pin

PRDP0020AC-B

(DP-20NEV)

P

—

HD74HC640FPEL

SOP-20 pin (JEITA)

PRSP0020DD-B

(FP-20DAV)

FP

EL (2,000 pcs/reel)

HD74HC640RPEL

HD74HC643RPEL

SOP-20 pin (JEDEC)

PRSP0020DC-A

(FP-20DBV)

RP

EL (1,000 pcs/reel)

Note:

Please consult the sales office for the above package availability.

Function Table

Control Inputs

Operation

G

DIR

HD74HC640

HD74HC643

L

L

B data to A bus

B data to A bus

L

H

A data to B bus

A data to B bus

H

X

Isolation

Isolation

H :

high level

L

:

low level

X :

irrelevant