© 2000 Fairchild Semiconductor Corporation DS010154 www.fairchildsemi.com
January 1990
Revised August 2000
74ACQ543• 74ACTQ543 Quiet Series
Octal Registered Transceiver with 3-STATE Outputs
74ACQ543• 74ACTQ543
Quiet Series
Octal Registered Transceiver
with 3-STATE Outputs
General Description
The ACQ/ACTQ543 is a non-inverting octal transceiver
containing two sets of D-type registers for temporary stor-
age of data flowing in either direction. Separate Latch
Enable and Output Enable inputs are provided for each
register to permit independent input and output control in
either direction of data flow.
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 for superior performance.
Features
■ Guaranteed simultaneous switching noise level and
dynamic threshold performance
■ Guaranteed pin-to-pin skew AC performance
■ 8-bit octal latched transceiver
■ Separate controls for data flow in each direction
■ Back-to-back registers for storage
■ Outputs source/sink 24 mA
■ 300 mil slim PDIP/SOIC
Ordering Code:
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the order code.
Connection Diagram Pin Descriptions
FACT, Quiet Series, FACT Quiet Series and GTO are trademarks of Fairchild Semiconductor Corporation.
Order Number Package Number Package Description
74ACQ543SC M24B 24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
74ACQ543SPC N24C 24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
74ACTQ543SC M24B 24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
74ACTQ543QSC MQA24 24-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150 Wide
74ACTQ543SPC N24C 24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Pin Names Description
OEAB
A-to-B Output Enable Input (Active LOW)
OEBA
B-to-A Output Enable Input (Active LOW)
CEAB
A-to-B Enable Input (Active LOW)
CEBA
B-to-A Enable Input (Active LOW)
LEAB
A-to-B Latch Enable Input (Active LOW)
LEBA
B-to-A Latch Enable Input (Active LOW)
A
0
–A
7
A-to-B Data Inputs or
B-to-A 3-STATE Outputs
B
0
–B
7
B-to-A Data Inputs or
A-to-B 3-STATE Outputs