HD74LS191FPEL View Datasheet(PDF) - Renesas Electronics

Part Name

Description

Manufacturer

HD74LS191FPEL

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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