PHILIPS 74HC HCT221 Dual Non-ReTriggerable Monostable Multivibrator with Reset User Manual
Summary
This product manual details the specifications for the dual non-retriggerable monostable multivibrator 74HC/HCT221. Designed for high-speed Si-gate CMOS applications, the device features jitter-free triggering, pin compatibility with LSTTL, and an active LOW reset. It is ideal for engineers and electronics technicians needing precise pulse width control in noise-sensitive environments.
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INTEGRATED CIRCUITS
DATA SHEET For a complete data sheet, please also download: The IC06 74HC/HCT/HCU/HCMOS Logic Family Specifications The IC06 74HC/HCT/HCU/HCMOS Logic Package Information The IC06 74HC/HCT/HCU/HCMOS Logic Package Outlines
74HC/HCT221 Dual non-retriggerable monostable multivibrator with reset
Product specification December
Supersedes data of April 1988 File under Integrated Circuits, IC06
Page Summary Contents For PHILIPS 74HC HCT221 Dual Non-ReTriggerable Monostable Multivibrator with Reset User Manual
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INTEGRATED CIRCUITS DATA SHEET For a complete data sheet, please also download: The IC06 74HC/HCT/HCU/HCMOS Logic Family Specifications The IC06 74HC/HCT/HCU/HCMOS Logic Package Information The IC06 7...
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Philips Semiconductors Product specification Dual non-retriggerable monostable 74HC/HCT221 multivibrator with reset FEATURES jitter-free triggering from inputs with slow transition rates, providing th...
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Philips Semiconductors Product specification Dual non-retriggerable monostable 74HC/HCT221 multivibrator with reset ORDERING INFORMATION See “74HC/HCT/HCU/HCMOS Logic Package Information”. PIN DESCRIP...
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Philips Semiconductors Product specification Dual non-retriggerable monostable 74HC/HCT221 multivibrator with reset FUNCTION TABLE INPUTS OUTPUTS n RD n A n B n Q n Q Notes 1. HIGH voltage level LOW v...
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Philips Semiconductors Product specification Dual non-retriggerable monostable 74HC/HCT221 multivibrator with reset Fig.5 Logic diagram. Note It is recommended to ground pins 6 (2CEXT) and 14 (1CEXT) ...
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Philips Semiconductors Product specification Dual non-retriggerable monostable 74HC/HCT221 multivibrator with reset DC CHARACTERISTICS FOR 74HC For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic...
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Philips Semiconductors Product specification Dual non-retriggerable monostable 74HC/HCT221 multivibrator with reset Tamb (°C) TEST CONDITIONS 74HC SYMBOL PARAMETER UNIT WAVEFORMS +25 −40 to +85 −40 to...
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Philips Semiconductors Product specification Dual non-retriggerable monostable 74HC/HCT221 multivibrator with reset DC CHARACTERISTICS FOR 74HCT For the DC characteristics see “74HC/HCT/HCU/HCMOS Logi...
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Philips Semiconductors Product specification Dual non-retriggerable monostable 74HC/HCT221 multivibrator with reset AC CHARACTERISTICS FOR 74HCT GND 0 V; tr tf 6 ns; CL 50 p F Tamb (°C) TEST CONDITION...
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Philips Semiconductors Product specification Dual non-retriggerable monostable 74HC/HCT221 multivibrator with reset Tamb (°C) TEST CONDITIONS 74HCT SYMBOL PARAMETER UNIT WAVEFORMS +25 −40 to +85 −40 t...
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Philips Semiconductors Product specification Dual non-retriggerable monostable 74HC/HCT221 multivibrator with reset AC WAVEFORMS Fig.7 Output pulse control; n RD HIGH. (1) HC VM VM 50%; VI GND to VCC....
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Philips Semiconductors Product specification Dual non-retriggerable monostable 74HC/HCT221 multivibrator with reset Fig.12 HC typical output pulse width as a function of timing capacitance (VCC = 2 V)...
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Philips Semiconductors Product specification Dual non-retriggerable monostable 74HC/HCT221 multivibrator with reset Fig.13 HC/HCT typical output pulse width as a function of timing capacitance (VCC 4....
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Philips Semiconductors Product specification Dual non-retriggerable monostable 74HC/HCT221 multivibrator with reset Fig.14 HC typical output pulse width as a function of timing capacitance (VCC V). De...
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Philips Semiconductors Product specification Dual non-retriggerable monostable 74HC/HCT221 multivibrator with reset Fig.15 Typical output pulse width as a function of Fig.16 k factor as a function of ...
Manual Details
| Brand | Philips |
|---|---|
| Pages | 15 |
| File Size | 244.74 KB |
| Published | June 22, 2026 |
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Frequently Asked Questions
How do I calculate the output pulse width?
The pulse width is approximately 0.7 * C_EXT * R_EXT.
Can this IC replace a '123' monostable multivibrator?
Yes, the pinout is identical, allowing substitution by adjusting timing components.
What prevents damage from a large external capacitor during power-down?
Use a damping diode (preferably germanium or Schottky) connected as shown in the protection circuit diagram.
How does the reset function work?
An active LOW reset input (nR_D) immediately terminates the output pulse.
What is the typical power dissipation capacitance?
For the 74HC version, C_PD is typically 90 pF; for 74HCT, it's 96 pF.