HD74LS191P Ver la hoja de datos (PDF) - Renesas Electronics

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HD74LS191P

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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