54AC163
•
54ACT163 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
n
n
n
n
n
Synchronous counting and loading
High-speed synchronous expansion
Typical count rate of 125 MHz
Outputs source/sink 24 mA
’ACT163 has TTL-compatible inputs
Standard Microcircuit Drawing (SMD)
— ’AC163: 5962-89582
— ’ACT163: 5962-91723
Features
n
I
CC
reduced by 50%
Logic Symbols
Pin
Names
CEP
CET
CP
SR
P
0
–P
3
PE
Q
0
–Q
3
DS100275-1
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
TC
IEEE/IEC
DS100275-2
FACT
™
is a trademark of Fairchild Semiconductor Corporation.
© 1998 National Semiconductor Corporation
DS100275
www.national.com
NSC [ NATIONAL SEMICONDUCTOR ]
