MC74HC161A Datasheet, PDF (9/16 Pages) ON Semiconductor – Presettable Counters

MC74HC161A, MC74HC163A
Sequence illustrated in waveforms:
1. Reset outputs to zero.
2. Preset to binary twelve.
3. Count to thirteen, fourteen, fifteen, zero, one and two.
4. Inhibit.
RESET (HC161A)
RESET (HC163A)
LOAD
(ASYNCHRONOUS)
(SYNCHRONOUS)
P0
PRESET P1
DATA
INPUTS _P2
P3
CLOCK (HC161A)
CLOCK (HC163A)
COUNT
ENABLES
ENABLE P
ENABLE T
Q0
Q1
OUTPUTS
Q2
Q3
RIPPLE
CARRY
OUT
12 13 14 15 0 1 2
COUNT
RESET LOAD
Figure 9. Timing Diagram
INHIBIT
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