54AC191L datasheet(1/10 Pages) NSC

Part #	54AC191L

Description	Up/Down Counter with Preset and Ripple Clock

PDF	10 Pages

Scroll/Zoom	100%

Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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54AC191

Up/Down Counter with Preset and Ripple Clock

General Description

The ’AC191 is a reversible modulo 16 binary counter. It fea-

tures synchronous counting and asynchronous presetting.

The preset feature allows the ’AC191 to be used in program-

mable dividers. The Count Enable input, the Terminal Count

output and the Ripple Clock output make possible a variety

of methods of implementing multistage counters. In the

counting modes, state changes are initiated by the rising

edge of the clock.

Features

n ICC reduced by 50%

n High speed — 133 MHz typical count frequency

n Synchronous counting

n Asynchronous parallel load

n Cascadable

n Outputs source/sink 24 mA

n Standard Military Drawing (SMD)

— ’AC191: 5962-89749

Logic Symbols

Pin Names

Description

CE

Count Enable Input

CP

Clock Pulse Input

P0–P3

Parallel Data Inputs

PL

Asynchronous Parallel Load Input

U/D

Up/Down Count Control Input

Q0–Q3

Flip-Flop Outputs

RC

Ripple Clock Output

TC

Terminal Count Output

Connection Diagrams

FACT™ is a trademark of Fairchild Semiconductor Corporation.

DS100279-1

IEEE/IEC

DS100279-2

Pin Assignment

for DIP and Flatpack

DS100279-3

Pin Assignment for LCC

DS100279-4

July 1998

DS100279

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54AC191L Datasheet(PDF) 1 Page - National Semiconductor (TI)

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