TECHNICAL DATA

IN74HC623A

Octal 3-State Noninverting

Bus Transceiver

High-Performance Silicon-Gate CMOS

ORDERING INFORMATION

IN74HC623AN Plastic

IN74HC623ADW SOIC

The IN74HC623A is identical in pinout to the LS/ALS623. The

device inputs are compatible with standard CMOS outputs; with pullup

resistors, they are compatible with LS/ALSTTL outputs.

The IN74HC623A is a 3-state noninverting transceiver that is used for

2-way communication between data buses. Two separate enables are

available. The enable for bus A to B is active-high, the enable for bus B

to A is active-low.

• 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

PIN ASSIGNMENT

LOGIC DIAGRAM

PIN 10 = GND

FUNCTION TABLE

Control Inputs

Output

Enable

Direction

Operation

L

L

Data Transmitted

from Bus B to

Bus A

L

H

Data Transmitted

from Bus A to

Bus B

H

L

Buses Isolated

L

H

(High Impedance

State)

Rev. 00