74ACT899

74ACT899 9-Bit Latchable Transceiver with Parity Generator/Checker

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74ACT899 9-Bit Latchable Transceiver with Parity Generator/Checker

January 1990 Revised December 1998

74ACT899 9-Bit Latchable Transceiver with Parity Generator/Checker
General Description
The 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 ACT899 features independent latch enables for the A-to-B direction and the B-toA direction, a select pin for ODD/EVEN parity, and separate error signal output pins for checking parity.

Features
s Latchable transceiver with output sink of 24 mA s Option to select generate parity and check or "feed-through" data/parity in directions A-to-B or B-to-A s Independent latch enable for A-to-B and B-to-A directions s Select pin for ODD/EVEN parity s ERRA and ERRB output pins for parity checking s Ability to simultaneously generate and check parity s May be used in system applications in place of the 280 s May be used in system applications in place of the 657 and 373 (no need to change T/R to check parity)

Ordering Code:
Order Number 74ACT899QC Package Number V28A Package Description 28-Lead Plastic Lead Chip Carrier (PLCC), JEDEC MO-047, 0.450" Square

Device also available in Tape and Reel. Specify by appending suffix letter "X" to the ordering code.

Logic Symbol

Connection Diagram
Pin Assignment for PCC

FACTTM is a trademark of Fairchild Semiconductor Corporation.

1999 Fairchild Semiconductor Corporation

DS010637.prf

www.fairchildsemi.com