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9316DMQB
Synchronous 4-Bit Counters
TL/F/6606
9316/DM9316
Synchronous
4-Bit
Counters
June 1989
9316/DM9316 Synchronous 4-Bit Counters
General Description
These synchronous, presettable counters featurean inter-
nal carry look-aheadfor applicationin high-speed counting
designs.The 9316is a4-bit binarycounter.The carry output decodedby meansofa NOR gate, thus preventing spikes
duringthe normal countingmodeof operation. Synchronous
operationis providedby havingall flip-flops clocked simulta-
neouslyso thatthe outputs change coincident with each
other whenso instructedbythe count-enables inputsand
internal gating. This modeof operating eliminatesthe output
counting spikes whichare normally associated with asyn-
chronous (ripple clock) counters.A buffered clock inputtrig-
gersthefour flip-flopsonthe rising (positive-going) edgeof
the clock input waveform.
These countersare fully programmable;thatis,the outputs
maybe presetto either level.As presettingis synchronous,
settingupalow levelatthe load input disablesthe counter
and causesthe outputsto agree withthe setup data after
the next clock pulse regardlessofthe levelsofthe enable
input. Low-to-high transitionsatthe load inputare perfectly
acceptable regardlessofthe logic levelsonthe clockor
enable inputs.The clear functionis asynchronousandalow
levelatthe clear input setsofthe flip-flop outputslowre-
gardlessofthe levelsof clock, load,or enable inputs.
The carry look-ahead circuitry providesfor cascading coun-
tersfor n-bit synchronous applications without additional
gating. Instrumentalin accomplishingthis functionaretwo
count-enable inputs anda ripple carry output. Both count-
enable inputs(PandT) must behighto count,and inputTis
fed-forwardto enablethe ripple carry output.The ripplecar- outputthus enabledwill producea high-level output pulse
witha duration approximately equaltothe high-level portiontheQA output. This high-level overflow ripple carry pulse
canbe usedto enable successive cascaded stages. High-
to-low leveltransitionsat theenable PorTinputs mayoccur
regardlessofthe logic levelinthe clock.
Features Internal look-aheadforfast counting Carry outputfor n-bit cascading Synchronous counting Load controlline Diode-clamped inputs Typical clock frequency35 MHz Pin-for-pin replacements popular 54/74 counters
5416A/7416A (binary) Alternate Military/Aerospace device (9316)is available.
Contacta National Semiconductor Sales Office/Distrib-
utorfor specifications.
Connection Diagram
Dual-In-Line Package
TL/F/6606–1
Order Number 9316DMQB,9316FMQB, DM9316J
DM9316Wor DM9316N
SeeNS PackageNumberJ16A, N16Eor W16A
C1995National SemiconductorCorporation RRD-B30M105/PrintedinU.S.A.
