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SL74HC640

Octal 3-State Inverting Bus Transceiver

System Logic Semiconductor 

SL74HC640

Octal 3-State Inverting Bus Transceiver

High-Performance Silicon-Gate CMOS

The SL74HC640 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 SL74HC640 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

SL74HC640N Plastic

SL74HC640D SOIC

TA = -55° to 125° C for all packages

LOGIC DIAGRAM

PIN ASSIGNMENT

PIN 20=VCC

PIN 10 = GND

SLS

System Logic

Semiconductor

FUNCTION TABLE

Control Inputs

Output Direction

Enable

L

L

L

H

H

X

X = don’t care

Operation

Data Transmitted

from Bus B to Bus

A (inverted)

Data Transmitted

from Bus A to Bus

B (inverted)

Buses Isolated

(High Impedance

State)

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