HD74LS640P 参数 Datasheet PDF下载

HD74LS640

Octal Bus Transceivers (inverted 3-state outputs)

REJ03D0487–0200

Rev.2.00

Feb.18.2005

This octal bus transceivers is designed for asynchronous two-way communication between data buses. The device

transmit data from the A bus to the B bus or from the B bus to the A bus depending upon the level at the direction

control (DIR) input. The enable input (G) can be used to disable the device so that the buses are effectively isolated.

Features

•

Ordering Information

Part Name

HD74LS640P

HD74LS640FPEL

Package Type

DILP-20 pin

SOP-20 pin (JEITA)

Package Code

(Previous Code)

PRDP0020AC-B

(DP-20NEV)

Package

Abbreviation

P

Taping Abbreviation

(Quantity)

—

EL (2,000 pcs/reel)

PRSP0020DD-B

FP

(FP-20DAV)

Note: Please consult the sales office for the above package availability.

Pin Arrangement

DIR

1A

2A

3A

4A

5A

6A

7A

8A

GND

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

V

CC

Enable

G

1B

2B

3B

4B

5B

6B

7B

8B

(Top view)

Function Table

Enable

G

L

L

H

Note: H; high level, L; low level, X; irrelevant

Direction Control

DIR

L

H

X

Operation

B

data to A bus

A

data to B bus

Isolation

Rev.2.00, Feb.18.2005, page 1 of 6