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FAST CARRY COUNTER PAC, MODEL CC-091
The Fast Carry Counter PAC, Model CC-091 (Figures A-50 and A-51), contains
eight pre-wired counter stages that can be set up by a few PAC connector jumpers to operate
as an eight-stage binary counter or a two-digit BCD counter.
In either configuration, carries
are anticipated by gating structures, to reduce counter propagation delays.
Each stage has a de set input for presetting a starting count, and a common reset
input for clearing all eight stages simultaneously.
INPUT AND OUTPUT SIGNALS
Count. -- The contents of the counter increase by one on the negative transition of
the count input.
This input is the same as the clock input of the integrated circuit flip-flop.
Common Reset. -- A signal at Ov for 80 nsec or longer on the common reset input
clears all eight counter stages simultaneously.
BCD and BIN inputs. -- These points are to be connected as shown in Figure A-52
for binary counting or as shown in Figure A-53 for BCD counting.
SPECIFICATIONS
Frequency of Operation (System)
DC to 5 me
Input Loading
DC set inputs:
2 / 3 unit load each
5 unit loads
Common reset:
Complement:
2 unit loads
Output Drive Capability
Output
Binari: Mode
A and E
5 unit loads each
A
and
E
8 unit loads each
Band F
5 unit loads each
Band
F
8 unit loads each
c
and G
6
unit loads each
c
and
G
8 unit loads each
D
6
unit loads each
H
8 unit loads each
D
and
H
8 unit loads each
BCD Mode
5 unit loads each
8 unit loads each
6 unit loads each
8 unit loads each
7 unit loads each
8 unit loads each
6 unit loads each
8 unit loads each
6 unit loads each
A-83
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