IN74HC640ADW 查看數據表（PDF） - Integral Corp.

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IN74HC640ADW

OCTAL 3-STATE INVERTING BUS TRANSCEIVER

Integral Corp. 

IN74HC640A

OCTAL 3-STATE INVERTING

BUS TRANSCEIVER

High-Performance Silicon-Gate CMOS

The IN74HC640A is identical in pinout to the LS/ALS640. The

device inputs are compatible with standard CMOS outputs; with

pullup resistors, they are compatible with LS/ALSTTL outputs.

The IN74HC640A is a 3-state transceiver that is used for 2-

way asynchronous communication between data buses. The

device has an active-low Output Enable pin, which is used to

place the I/O ports into high-impedance states. The Direction

control determines whether data flows from A to B or from B to A.

• Outputs Directly Interface to CMOS, NMOS, and TTL

• Operating Voltage Range: 2.0 to 6.0 V

• Low Input Current: 1.0 µA

• High Noise Immunity Characteristic of CMOS Devices

ORDERING INFORMATION

IN74HC640AN Plastic

IN74HC640ADW SOIC

TA = -55° to 125° C for all

packages

PIN ASSIGNMENT

LOGIC DIAGRAM

PIN 20=VCC

PIN 10 = GND

FUNCTION TABLE

Control Inputs

Output Direction

Operation

Enable

L

L

Data Transmitted

from Bus B to Bus

A (inverted)

L

H

Data Transmitted

from Bus A to Bus

B (inverted)

H

X

Buses Isolated

(High Impedance

State)

X = don’t care

1

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