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HD74BC645A

Octal Bus Transceivers With 3 State Outputs

Hitachi -> Renesas Electronics 

HD74BC645A

Octal Bus Transceivers With 3 State Outputs

ADE-205-027 (Z)

Rev.0

June 1993

Description

The HD74BC645A 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. Each device has an active low enable input (G) and a direction

control input, DiR. When DiR is high, data flows from the A inputs to the B outputs. When DiR is high,

data flows from the B inputs to the A outputs. When enable inputs (G) is high, disables both A and B ports

by placing then in a high impedance.

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.

Function Table

Control Inputs

G

DIR

L

L

L

H

H

X

H : High level

L : Low level

X : Immaterial

Z : High impedance

Operation

B data to A bus

A data to B bus

Z

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