Rev.2.00, Jul.16.2004, page 1 of 7

HD74BC623A

Octal Bus Transceivers With 3 State Outputs

REJ03D0289–0200Z

(Previous ADE-205-025 (Z))

Rev.2.00

Jul.16.2004

Description

The HD74BC623A provides high drivability and operation equal to or better than high speed bipolar standard logic IC

by using Bi-CMOS process. The device features low power dissipation that is about 1/5 of high speed bipolar logic IC.

When the frequency is 10 MHz. The device has eight bus transceivers with three state outputs in a 20 pin package.

This device allows data transmission from the A bus to the B bus or from the B bus to the A bus depending upon the

logic levels at the enable inputs (

GBA and GAB). The enable inputs can be used to disable the device so that the buses

are effectively isolated.

Features

• Input/Output are at high impedance state when power supply is off.

• Input pins can be open, when not used, owing to built in input pull up circuit.

• Input is TTL level.

• Wide operating temperature range

Ta = –40 to +85°C.

• Ordering Information

Part Name

Package Type

Package Code

Package

Abbreviation

Taping Abbreviation

(Quantity)

HD74BC623AFPEL

SOP-20 pin (JEITA) FP-20DAV

FP

EL (2,000 pcs/reel)

Function Table

Enable Inputs

GBA

GAB

Operation

L

L

B data to A bus

H

H

A data to B bus

H

L

Isolation

L

H

B data to A bus

A data to B bus

H :

High level

L

:

Low level