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MC74HC163

Presettable Counters

ON Semiconductor 

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 12. Timing Diagram

INHIBIT

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