74221

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 Supersedes data of April 1988 File under Integrated Circuits, IC06 December 1990 Philips Semiconductors Product specification Dual non-retriggerable monostable multivibrator with reset 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 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. 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...