54ACQ245

Quiet Series Octal Bidirectional Transceiver with

General Description

The ’ACQ/’ACTQ245 contains eight non-inverting bidirec-

tional buffers with TRI-STATE outputs and is intended for

bus-oriented applications. Current sinking capability is

24 mA at both the A and B ports. The Transmit/Receive (T/R)

input determines the direction of data flow through the bidi-

rectional transceiver. Transmit (active-HIGH) enables data

from A ports to B ports; Receive (active-LOW) enables data

from B ports to A ports. The Output Enable input, when

HIGH, disables both A and B ports by placing them in a HIGH

Z condition.

The ’ACQ/’ACTQ utilizes NSC Quiet Series technology to

guarantee quiet output switching and improve dynamic

a split ground bus for superior performance.

Features

n Guaranteed simultaneous switching noise level and

dynamic threshold performance

n Improved latch-up immunity

n TRI-STATE outputs drive bus lines or buffer memory

address registers

n Outputs source/sink 24 mA

n Faster prop delays than the standard ’ACT245

n 4 kV minimum ESD immunity (’ACQ)

n Standard Military Drawing (SMD)

— ’ACTQ245: 5962-92187

— ’ACQ245: 5962-92177

Logic Symbols

Pin

Description

Names

OE

Output Enable Input

T/R

Transmit/Receive Input

A

Side A TRI-STATE Inputs or TRI-STATE Outputs

B

Side B TRI-STATE Inputs or TRI-STATE Outputs

DS100237-1

IEEE/IEC

DS100237-2

September 1998

© 1998 National Semiconductor Corporation

DS100237

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