74ACQ657 Datasheet, PDF (1/10 Pages) Fairchild Semiconductor – Quiet Series™ Octal Bidirectional Transceiver with 8-Bit Parity Generator/Checker and 3-STATE Outputs

January 1990
Revised September 2000
74ACQ657 • 74ACTQ657
Quiet Series Octal Bidirectional Transceiver with
8-Bit Parity Generator/Checker and 3-STATE Outputs
General Description
The ACQ/ACTQ657 contains eight non-inverting buffers
with 3-STATE outputs and an 8-bit parity generator/
checker. Intended for bus oriented applications, the device
combines the 245 and the 280 functions in one package.
The ACQ/ACTQ utilizes Fairchild Quiet Series technol-
ogy to guarantee quiet output switching and improved
dynamic threshold performance. FACT Quiet Series fea-
tures GTO output control and undershoot corrector in
addition to a split ground bus or superior performance.
Features
s Guaranteed simultaneous switching noise level and
dynamic threshold performance
s Guaranteed pin-to-pin skew AC performance
s Combines the 245 and the 280 functions in one package
s 300 mil 24-pin slim dual-in-line package
s Outputs source/sink 24 mA
s ACTQ has TTL-compatible inputs
Ordering Code:
Order Number Package Number
Package Description
74ACQ657SPC
N24C
24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
74ACTQ657SC
M24B
24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
74ACTQ657SPC
N24C
24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code
Logic Symbols
Connection Diagram
IEEE/IEC
Pin Descriptions
Pin Names
A₀–A₇
B₀–B₇
T/R
OE
PARITY
ODD/EVEN
ERROR
Description
Data Inputs/3-STATE Outputs
Data Inputs/3-STATE Outputs
Transmit/Receive Input
Enable Input
Parity Input/3-STATE Output
ODD/EVEN Parity Input
Error 3-STATE Output
FACT, Quiet Series, FACT Quiet Series, and GTO are trademarks of Fairchild Semiconductor Corporation.
© 2000 Fairchild Semiconductor Corporation DS010636
www.fairchildsemi.com