TLF5904

February 1988

MM54C221MM74C221 Dual Monostable Multivibrator

General Description

The MM54C221MM74C221 dual monostable multivibrator

is a monolithic complementary MOS integrated circuit Each

multivibrator features a negative-transition-triggered input

and a positive-transition-triggered input either of which can

be used as an inhibit input and a clear input

Once fired the output pulses are independent of further

transitions of the A and B inputs and are a function of the

Pulse stability will be limited by the accuracy of external

timing components The pulse width is approximately de-

information and applications see AN-138

Features

Y

Wide supply voltage range

45V to 15V

Y

Guaranteed noise margin

10V

Y

High noise immunity

Y

Low power TTL compatibility

fan out of 2

driving 74L

Connection Diagrams

Timing Component

TLF5904 – 1

Dual-In-Line Package

TLF5904 – 2

Top View

Order Number MM54C221 or MM74C221

Truth Table

Inputs

Outputs

Clear

A

B

Q

Q

LX

X

L

H

XH

X

L

H

XX

L

L

H

HL

u

H

v

H

H

e

High level

L

e

Low level

e

One high level pulse

e

One low level pulse

X

e

Irrelevant

C1995 National Semiconductor Corporation

RRD-B30M105Printed in U S A