TL/F/9780
5497/DM7497
Synchronous
Modulo-64
Bit
Rate
Multiplier
June 1989
5497/DM7497
Synchronous Modulo-64 Bit Rate Multiplier
General Description
The ’97 contains a synchronous 6-stage binary counter and
six decoding gates that serve to gate the clock through to
the output at a sub-multiple of the input frequency. The out-
put pulse rate, relative to the clock frequency, is determined
by signals applied to the Select (S0–S5) inputs. Both true
and complement outputs are available, along with an enable
input for each. A Count Enable input and a Terminal Count
output are provided for cascading two or more packages.
An asynchronous Master Reset input prevents counting and
resets the counter.
Connection Diagram
Dual-In-Line Package
TL/F/9780–1
Order Number 5497DMQB, 5497FMQB or DM7497N
See NS Package Number J16A, N16E or W16A
Logic Symbol
TL/F/9780–2
V
CC
e Pin 16
GND e Pin 8
Pin Names Description
S0–S5 Rate Select Inputs
E
Z
O
Z
Enable Input (Active LOW)
E
Y
O
Y
Enable Input
CE Count Enable Input (Active LOW)
CP Clock Pulse Input (Active Rising Edge)
MR Asynchronous Master Reset Input (Active HIGH)
O
Z
Gated Clock Output (Active LOW)
O
y
Complement Output (Active HIGH)
TC Terminal Count Output (Active LOW)
C
1995 National Semiconductor Corporation RRD-B30M115/Printed in U. S. A.