Fairchild MM74C221 Dual Monostable Multivibrator Data Handbook
Summary
This dual monostable multivibrator integrated circuit is a high-performance digital component designed for applications requiring precise pulse generation and timing delay within systems operating from 4.5V to 15V. The accompanying documentation provides extensive technical specifications, including detailed electrical characteristics, AC/DC performance metrics, propagation delays, and troubleshooting guides. It is essential reading for electronics engineers and circuit designers integrating robust time-based digital logic into their hardware designs.
Page 1 Text Content
74C 221 D al M stab le M ltivib rato
November 1987 Revised January 1999
MM74C221 Dual Monostable Multivibrator
Pulse stability will be limited by the accuracy of external
General Description
timing components. The pulse width is approximately
The MM74C221 dual monostable multivibrator is a mono-
defined by the relationship t W(OUT) ≈ CEXT REXT. For fur-
lithic complementary MOS integrated circuit. Each multivi-
ther information and applications, see AN-138.
brator features a negative-transition-triggered input and a positive-transition-triggered input, either of which can be
Features
used as an inhibit input, and a clear input.
Once fired, the output pulses are independent of further Wide supply voltage range: 4.5V to 15V
transitions of the A and B inputs and are a function of the Guaranteed noise margin: 1.0V external timing components CEXT and REXT. The pulse
High noise immunity: 0.45 VCC (typ.)
width is stable over a wide range of temperature and VCC.
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 Truth Table
Inputs Outputs
Timing Component
Clear
H = HIGH Level = One HIGH level pulse L = LOW Level = One LOW level pulse Pin Assignments for DIP ↑ = Transition from LOW-to-HIGH X= Irrelevant ↓ = Transition from HIGH-to-LOW
Top View
© 1999 Fairchild Semiconductor Corporation DS005904.prf www.fairchildsemi.com
Page Summary Contents For Fairchild MM74C221 Dual Monostable Multivibrator Data Handbook
Manual Details
| Brand | Fairchild |
|---|---|
| Pages | 6 |
| File Size | 63.40 KB |
| Published | July 07, 2026 |
Enter the captcha to get the download link:
Frequently Asked Questions
How is the pulse width of the MM74C221 determined?
The pulse width time is approximately defined by the relationship t ≈ C R, limited by external timing components.
What is the recommended operating voltage range for this IC?
The device operates within a wide supply voltage range of 4.5V to 15V.
Is the output pulse stable across different temperatures?
Yes, the pulse width is noted as being stable over a wide range of temperature and V.
How many transitions can trigger the dual monostable multivibrator?
The device features dedicated negative-transition-triggered and positive-transition-triggered inputs (A and B).