HD74LS191 데이터 시트보기 (PDF) - Renesas Electronics

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HD74LS191

Synchronous Up / Down 4-bit Binary Counter (single clock line)

Renesas Electronics 

HD74LS191

Count Sequences

Load

A

B

C

D

Clock

Down/Up

Enable G

QA

QB

QC

QD

Max/Min

Ripple

Clock

13 14 15 0 1 2

2

1 0 15 14 13

Load

Count Up

Inhibit

Count Down

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.

Rev.2.00, Feb.18.2005, page 6 of 10

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