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MM74C221N

Dual Monostable Multivibrator

Fairchild Semiconductor 

November 1987

Revised January 1999

MM74C221

Dual Monostable Multivibrator

General Description

The MM74C221 dual monostable multivibrator is a mono-

lithic complementary MOS integrated circuit. Each multivi-

brator 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

external timing components CEXT and REXT. The pulse

width is stable over a wide range of temperature and VCC.

Pulse stability will be limited by the accuracy of external

timing components. The pulse width is approximately

defined by the relationship tW(OUT) ≈ CEXT REXT. For fur-

ther information and applications, see AN-138.

Features

s Wide supply voltage range: 4.5V to 15V

s Guaranteed noise margin: 1.0V

s High noise immunity: 0.45 VCC (typ.)

s Low power TTL compatibility: fan out of 2 driving 74L

Ordering Code:

Order Number Package Number

Package Description

74MMC221N

N16E

16-Lead Plastic Dual-in-Line Package (PDIP), JEDEC MS-001, 0.300” Wide

Connection Diagrams

Timing Component

Pin Assignments for DIP

Truth Table

Inputs

Outputs

Clear

A

B

Q

Q

L

X

X

L

H

X

H

X

L

H

X

H

H

X

L

↓

L

↑

H

L

H

H = HIGH Level

L = LOW Level

 = One HIGH level pulse

= One LOW level pulse

↑ = Transition from LOW-to-HIGH X= Irrelevant

↓ = Transition from HIGH-to-LOW

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© 1999 Fairchild Semiconductor Corporation DS005904.prf

www.fairchildsemi.com

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