National Semiconductor MM54C221 MM74C221 Dual Monostable Multivibrator Specifications Manual
Summary
This IC is a dual monostable multivibrator circuit essential for generating reliable electrical pulses. It features negative- or positive-transition triggering to create stable output signals that remain fixed regardless of subsequent input changes. The manual provides comprehensive specifications, covering operating voltage ranges (4.5V–15V), TTL compatibility, and timing parameters crucial for coupling with external components like resistors (R) and capacitors (C). Ideal for electronics designers requiring reliable, low-power pulse generation in various control and timing applications.
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MM54C221/MM74C221 Dual Monostable Multivibrator General Description
The MM54C221/MM74C221 dual monostable multivibrator Pulse stability will be limited by the accuracy of external is monolithic complementary MOS integrated circuit. Each timing components. The pulse width is approximately de- multivibrator features negative-transition-triggered input fined by the relationship t W(OUT) CEXT REXT. For further
and positive-transition-triggered input, either of which can information and applications, see AN-138. be used as an inhibit input, and clear input.
Once fired, the output pulses are independent of further Features
transitions of the and inputs and are function of the Wide supply voltage range 4.5V to 15V external timing components CEXT and REXT. The pulse Guaranteed noise margin 1.0V width is stable over wide range of temperature and VCC.
High noise immunity 0.45 VCC (typ.) Low power TTL compatibility fan out of
driving 74L
Connection Diagrams
Timing Component Dual-In-Line Package
TL/F/5904–1
TL/F/5904–2
Order Number MM54C221 or MM74C221
Truth Table
Inputs Outputs
Clear
High level Low level Transition from low to high Transition from high to low One high level pulse One low level pulse Irrelevant
C1995 National Semiconductor Corporation TL/F/5904 RRD-B30M105/Printed in U. S. A.
Page Summary Contents For National Semiconductor MM54C221 MM74C221 Dual Monostable Multivibrator Specifications Manual
Manual Details
| Brand | National |
|---|---|
| Pages | 6 |
| File Size | 148.69 KB |
| Published | June 18, 2026 |
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Frequently Asked Questions
What is the required operating voltage range for this chip?
The recommended operating voltage range is 4.5V to 15V.
How does pulse width depend on external components?
Pulse stability and width are determined by the external timing components C and R, following the relationship t = CR.
What is the low power supply current for standby mode?
The supply current in standby (Q1=L, Q2=L) is approximately 0.05 mA.
Does this device have TTL compatibility?
Yes, it is listed as having TTL compatibility.