54AC163 Datasheet, PDF (1/12 Pages) National Semiconductor (TI) – Synchronous Presettable Binary Counter

November 1998
54AC163 • 54ACT163
Synchronous Presettable Binary Counter
General Description
The ’AC/’ACT163 are high-speed synchronous modulo-16
binary counters. They are synchronously presettable for ap-
plication in programmable dividers and have two types of
Count Enable inputs plus a Terminal Count output for versa-
tility in forming synchronous multistage counters. The ’AC/
’ACT163 has a Synchronous Reset input that overrides
counting and parallel loading and allows the outputs to be si-
multaneously reset on the rising edge of the clock.
n Synchronous counting and loading
n High-speed synchronous expansion
n Typical count rate of 125 MHz
n Outputs source/sink 24 mA
n ’ACT163 has TTL-compatible inputs
n Standard Microcircuit Drawing (SMD)
— ’AC163: 5962-89582
— ’ACT163: 5962-91723
Features
n I_CC reduced by 50%
Logic Symbols
DS100275-1
Pin
Names
CEP
CET
CP
SR
P₀– P₃
PE
Q₀– Q₃
TC
Description
Count Enable Parallel Input
Count Enable Trickle Input
Clock Pulse Input
Synchronous Reset Input
Parallel Data Inputs
Parallel Enable Input
Flip-Flop Outputs
Terminal Count Output
IEEE/IEC
DS100275-2
FACT™ is a trademark of Fairchild Semiconductor Corporation.
© 1998 National Semiconductor Corporation DS100275
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