74HC221
FEATURES
- Pulse width variance is typically less than ± 5%
- Pin-out identical to “123”
- Overriding reset terminates output pulse
- n B inputs have hysteresis for improved noise immunity
- Output capability: standard (except for n REXT/CEXT)
- ICC category: MSI GENERAL DESCRIPTION
The 74HC/HCT221 are high-speed Si-gate CMOS devices and are pin patible with low power Schottky TTL (LSTTL). They are specified in pliance with JEDEC standard no. 7A. The 74HC/HCT221 are dual non-retriggerable monostable multivibrators. Each multivibrator features an active LOW-going edge input (n A) and an active HIGH-going edge input (n B), 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 n B inputs allow
74HC/HCT221 jitter-free triggering from inputs with slow transition rates, providing the circuit with excellent noise immunity. Once triggered,...
