'LS292

1

4

CLK1

5

CLK2

n = 0

n = 1

fi

11

CLR

3

TP1

6

TP2

13

TP3

7

Q

10

A

i

n

f

2

é

ù

ê

ú

ë

û

1

B

15

C

14

D

2

E

0

4

0

n

31

é ù

ë û

R

i

o

n

f

f

2

é

ù

ê

ú

ë

û

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SN74LS292, SN74LS294

SDLS153A – JANUARY 1981 – REVISED JANUARY 2016

SN74LS29x Programmable Frequency Dividers and Digital Timers

1 Features

3 Description

The

SN74LS29x

devices

are

programmable

1

•

Count Divider Chain

frequency dividers and digital timers contain 31 flip-

•

Digitally Programmable from 22 to 2n

flops plus 30 gates (in SN74LS292) or 15 flip-flops

(n = 31 for SN74LS292 , n = 15 for SN74LS294)

plus 29 gates (in SN74LS294) on a single chip. The

•

Useable Frequency Range from DC to 30 MHz

count modulo is under digital control of the inputs

provided.

•

Easily Expandable

Both types feature an active-low CLR clear input to

2 Applications

initialize the state of all flip-flops. To facilitate the

incoming inspection, test points are provided (TP1,

•

Frequency Division

TP2, and TP3 on the SN74LS292, and TP on the

•

Digital Timing

SN74LS294). These test points are not intended to

drive system loads. Both types feature two clock

inputs; either one may be used for clock gating (see

Table 1).

A brief look at the digital timing capabilities of the

SN74LS292

shows

that

with

a

1-MHz

input

frequency, programming for 210 gives a period of

1.024 ms, 220 gives a period of 1.05 sec, 226 gives a

period of 1.12 min, and 231 gives a period of 35.79

min.

These devices are easily cascadable, giving limitless

possibilities to achievable timing delays.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

SN74LS292N

PDIP (16)

6.35 mm × 19.30 mm

SN74LS294N

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Logic Symbols

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.