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5962-9219601M3A
Quiet Series Octal Transceiver/Register with 3-STATE Outputs
54ACTQ646
Quiet Series Octal Transceiver/Register with 3-STATE
Outputs
General DescriptionThe ACTQ646 consistof registeredbus transceiver circuits,
with outputs, D-type flip-flops,and control circuitry providing
multiplexed transmissionof data directly fromthe inputbus
orfromthe internal storage registers. Dataon theAorBbus
willbe loaded into the respective registerson the
LOW-to-HIGH transitionofthe appropriate clockpin (CPAB
orCPBA).Thefour fundamental handling functions available
are illustratedin Figures1,2,3,4.
The ACTQ utilizes FSC Quiet Series technologyto guaran-
tee quiet output switchingand improved dynamic threshold
performance. FACT Quiet Series™ features GTO™ output
controland undershoot correctorin additiontoasplit ground
busfor superior performance.
Features Guaranteed simultaneous switching noise leveland
dynamic threshold performance Independent registersforAandB busses Multiplexed real-timeand stored data transfers 300milslim dual-in-line package Outputs source/sink24mA Faster prop delays thanthe standard AC/ACT6464kV minimum ESD immunity Standard Microcircuit Drawing (SMD) 5962-9219601
Logic Symbols
Pin Descriptions
Pin Names DescriptionA0–A7 Data RegisterA Inputs
Data RegisterA Outputs
B0–B7 Data RegisterB Inputs
Data RegisterB Outputs
CPAB,
CPBA
Clock Pulse Inputs
SAB, SBA Transmit/Receive Inputs
GTO™ isatrademark ofNationalSemiconductor Corporation
FACT™andFACTQuietSeries™are trademarksof FairchildSemiconductor Corporation
DS100326-1
IEEE/IECDS100326-2
September 1998
54ACTQ646
Quiet
Series
Octal
ransceiver/Register
with
3-ST
Outputs 1998 National Semiconductor Corporation DS100326
