74HCT221 Series

Dual non-retriggerable monostable multivibrator with reset

Catalog

Dual non-retriggerable monostable multivibrator with reset

Part	Propagation Delay	Package Name	Package Width	Package Length	Independent Circuits	Mounting Type	Operating Temperature (Max)	Operating Temperature (Min)	Current - Output Low	Current - Output High	Schmitt Trigger Input	Logic Type	Voltage - Supply (Maximum)	Voltage - Supply (Minimum)
Nexperia USA Inc. 74HCT221D,112	31 ns	16-SO 16-SOIC	3.9 mm	0.154 in	2	Surface Mount	125 °C	-40 °C	4 mA	4 mA	Yes	Monostable	5.5 V	4.5 V
Nexperia USA Inc. 74HCT221D,118	31 ns	16-SO 16-SOIC	3.9 mm	0.154 in	2	Surface Mount	125 °C	-40 °C	4 mA	4 mA	Yes	Monostable	5.5 V	4.5 V

Catalog

Dual non-retriggerable monostable multivibrator with reset

Description

The 74HCT221 is a dual non-retriggerable monostable multivibrator. Each multivibrator features edge-triggered inputs (nAand 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 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 nAand nB inputs. The output pulse width is defined by the following relationship: