74ACT899 Datasheet, PDF (1/9 Pages) Fairchild Semiconductor – 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 trans-
parent 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 inde-
pendent latch enables for the A-to-B direction and the B-to-
A direction, a select pin for ODD/EVEN parity, and sepa-
rate 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 Package Number
Package Description
74ACT899QC
V28A
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
FACT™ is a trademark of Fairchild Semiconductor Corporation.
© 1999 Fairchild Semiconductor Corporation DS010637.prf
www.fairchildsemi.com