TLF10637

August 1994

74AC899

9-Bit Latchable Transceiver

with Parity GeneratorChecker

General Description

The ’AC’ACT899 is a 9-bit to 9-bit parity transceiver with

transparent latches The device can operate as a feed-

through transceiver or it can generatecheck parity from the

8-bit data busses in either direction The ’AC’ACT899 fea-

tures independent latch enables for the A-to-B direction and

the B-to-A direction a select pin for ODDEVEN parity and

separate error signal output pins for checking parity

Features

Y

Latchable transceiver with output sink of 24 mA

Y

Option to select generate parity and check or ‘‘feed-

through’’ dataparity in directions A-to-B or B-to-A

Y

Independent latch enable for A-to-B and B-to-A direc-

tions

Y

Select pin for ODDEVEN parity

Y

ERRA and ERRB output pins for parity checking

Y

Ability to simultaneously generate and check parity

Y

May be used in system applications in place of the ’280

Y

May be used in system applications in place of the ’657

and ’373 (no need to change TR to check parity)

Y

4 kV minimum ESD immunity

Logic Symbol

TLF10637 – 1

Connection Diagram

Pin Assignment for PCC and LCC

TLF10637 – 2

TRI-STATE

is a registered trademark of National Semiconductor Corporation

C1995 National Semiconductor Corporation

RRD-B30M75Printed in U S A