HD74HC190DP 查看數據表（PDF） - Hitachi -> Renesas Electronics

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HD74HC190DP

Synchronous Up/Down Decade Counter with Single Clock Line

Hitachi -> Renesas Electronics 

HD74HC190/HD74HC191

HD74HC191

Illustrated below is the following sequence:

1. Load (preset) to binary thirteen.

2. Count up to fourteen, fifteen (maximum), zero, one and two.

3. Inhibit

4. Count down to one, zero (minimum), fifteen, fourteen and thirteen.

Load

A

Data B

Inputs C

D

Clock

Down/Up

Enable G

QA

QB

QC

QD

Max/Min

Ripple

Clock

13 14 15 0 1 2 2

Count Up

Inhibit

Load

1 0 15 14 13

Count Down

4

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