NXP Semiconductors 74221
The 74HC/HCT221 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard no.| Part No. | 74221 |
|---|---|
| Datasheet | 74221 Download |
| Manufacturer |  NXP Semiconductors |
| Description | Dual non-retriggerable monostable multivibrator |
| Buy | Stock & Price |
FEATURES
● Pulse width variance is typically less than ± 5%● Pin-out identical to “123”
● Overriding reset terminates output pulse
● nB inputs have hysteresis for improved noise immunity
● Output capability: standard (except for nREXT/CEXT)
● ICC category: MSI
GENERAL DESCRIPTION
7A. The 74HC/HCT221 are dual non-retriggerable monostable multivibrators. Each multivibrator features an active LOW-going edge input (nA) and an active HIGH-going edge input (nB), either of which can be used as an enable input. Pulse triggering occurs at a particular voltage level and is not directly related to the transition time of the input pulse. Schmitt-trigger input circuitry for the nB inputs allow 74HC/HCT221 jitter-free triggering from inputs with slow transition rates, providing the circuit with excellent noise immunity. Once triggered, the outputs (nQ, nQ) are independent of further transitions of nA and nB inputs and are a function of the timing components. The output pulses can be terminated by the overriding active LOW reset inputs (nRD).
