TLF5960

February 1988

CD4029BMCD4029BC Presettable

BinaryDecade UpDown Counter

General Description

The CD4029BMCD4029BC is a presettable updown

counter which counts in either binary or decade mode de-

pending on the voltage level applied at binarydecade input

When binarydecade is at logical ‘‘1’’ the counter counts in

binary otherwise it counts in decade Similarly the counter

counts up when the updown input is at logical ‘‘1’’ and vice

versa

A logical ‘‘1’’ preset enable signal allows information at the

‘‘jam’’ inputs to preset the counter to any state asynchro-

nously with the clock The counter is advanced one count at

the positive-going edge of the clock if the carry in and pre-

set enable inputs are at logical ‘‘0’’ Advancement is inhibit-

ed when either or both of these two inputs is at logical ‘‘1’’

The carry out signal is normally at logical ‘‘1’’ state and goes

to logical ‘‘0’’ state when the counter reaches its maximum

count in the ‘‘up’’ mode or the minimum count in the ‘‘down’’

mode provided the carry input is at logical ‘‘0’’ state

All inputs are protected against static discharge by diode

Features

Y

Wide supply voltage range

3V to 15V

Y

High noise immunity

Y

Low power

fan out of 2

TTL compatibility

driving 74L

or 1 driving 74LS

Y

Parallel jam inputs

Y

Binary or BCD decade updown counting

Logic Diagram

TLF5960 – 1

C1995 National Semiconductor Corporation

RRD-B30M105Printed in U S A