74HC191FP データシートの表示（PDF） - Hitachi -> Renesas Electronics

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74HC191FP

Synchronous Up/Down Decade Counter with Single Clock Line

Hitachi -> Renesas Electronics 

HD74HC190/HD74HC191

Timing Chart

HD74HC190

Illustrated below is the following sequence:

1. Load (preset) to BCD seven.

2. Count up to eight, nine (maximum), zero, one and two.

3. Inhibit

4. Count down to one, zero (minimum), nine, eight and seven.

Load

A

B

C

D

Clock

Down/Up

Enable G

QA

QB

QC

QD

Max/Min

Ripple

Clock

7 8 9 0 12

221 0 9 8 7

Load

Count Up

Inhibit

Count Down

3

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