74AC899 Datasheet, PDF (1/14 Pages) National Semiconductor (TI) – 9-Bit Latchable Transceiver with Parity Generator/Checker

August 1994
74AC899  54ACT 74ACT899
9-Bit Latchable Transceiver
with Parity Generator Checker
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 generate check 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 ODD EVEN 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’’ data parity 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 ODD EVEN 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 T R to check parity)
Y _{4 kV minimum ESD immunity}
Logic Symbol
Connection Diagram
Pin Assignment for PCC and LCC
TL F 10637 – 1
TL F 10637 – 2
TRI-STATE is a registered trademark of National Semiconductor Corporation
FACTTM is a trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation TL F 10637
RRD-B30M75 Printed in U S A