The 74VHC221A is an advanced high speed CMOS Monostable Multivibrator fabricated with silicon gate CMOS technology
The 74VHC221A is a high‑speed CMOS dual non‑retriggerable monostable multivibrator with separate negative (A) and positive (B) trigger inputs, a clear input, and low power consumption. It is pin‑compatible with the 74HC221A and includes input protection for 0‑7 V.
Key specifications include a typical propagation delay of 8.1 ns at 5 V, supply voltage range of 2.0 V to 5.5 V, and selectable surface‑mount packages (SOIC, SOP, TSSOP). The datasheet details absolute maximum ratings, recommended operating conditions, DC/AC electrical characteristics, and mechanical dimensions.
| Typical propagation delay (tPD) | 8.1 ns at VCC = 5 V |
|---|---|
| Maximum supply current (ICC) – low power | 4 µA (Max.) at TA = 25 °C |
| Maximum supply current (ICC) – active state | 600 µA (Max.) at TA = 25 °C |
| Noise immunity | VNIH = V NIL = 28 % VCC (Min.) |
| Supply voltage (VCC) | 2.0 V to 5.5 V |
| Input voltage (VIN) | 0 V to 5.5 V |
| Output voltage (VOUT) | -0.5 V to VCC + 0.5 V |
| Package options | SOIC (M16A), SOP (M16D), TSSOP (MTC16) |
The typical propagation delay is 8.1 ns at a supply voltage of 5 V.
It operates from 2.0 V up to 5.5 V.
The device is available in SOIC (M16A), SOP (M16D), and TSSOP (MTC16) packages.
Yes, it cannot be retriggered until the output pulse times out.