54AC169 Datasheet, PDF (1/10 Pages) National Semiconductor (TI) – 4-Stage Synchronous Bidirectional Counter

July 1998
54AC169 • 54ACT169
4-Stage Synchronous Bidirectional Counter
General Description
The ’AC/’ACT169 is fully synchronous 4-stage up/down
counter. The ’AC/’ACT169 is a modulo-16 binary counter. It
features a preset capability for programmable operation,
carry lookahead for easy cascading and a U/D input to con-
trol the direction of counting. All state changes, whether in
counting or parallel loading, are initiated by the
LOW-to-HIGH transition of the Clock.
n Synchronous counting and loading
n Built-In lookahead carry capability
n Presettable for programmable operation
n Outputs source/sink 24 mA
n ’ACT has TTL-compatible inputs
n Standard Microcircuit Drawing (SMD)
5962-91603
Features
n I_CC reduced by 50%
Logic Symbols
DS100276-1
IEEE/IEC
Pin
Names
CEP
CET
CP
P₀– P₃
PE
U/D
Q₀– Q₃
TC
Description
Count Enable Parallel Input
Count Enable Trickle Input
Clock Pulse Input
Parallel Data Inputs
Parallel Enable Input
Up-Down Count Control Input
Flip-Flop Outputs
Terminal Count Output
DS100276-2
FACT™ is a trademark of Fairchild Semiconductor Corporation.
© 1998 National Semiconductor Corporation DS100276
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