MM74C221

MM74C221 Dual Monostable Multivibrator

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MM74C221 Dual Monostable Multivibrator

November 1987 Revised May 2002

MM74C221 Dual Monostable Multivibrator
General Description
The MM74C221 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 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 further 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 74MMC221N Package Number N16E Package Description 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide

Connection Diagrams
Timing Component

Truth Table
Inputs Clear L X X H H A X H X L B X X L Outputs Q L L Q H H

H HIGH Level L LOW Level X Irrelevant Transition from LOW-to-HIGH Transition from HIGH-to-LOW One HIGH Level Pulse One LOW Level Pulse

Top View

2002 Fairchild Semiconductor Corporation

DS005904

www.fairchildsemi.com