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74221

Dual Monostable Multivibrators (with Schmitt Trigger Input)

NXP Semiconductors. 

Philips Semiconductors

Dual non-retriggerable monostable

multivibrator with reset

Product specification

74HC/HCT221

SYMBOL PARAMETER

tW

trem

REXT

trigger pulse width

nQ or nQ

removal time

nRD to nA or nB

external timing resistor

Tamb (°C)

TEST CONDITIONS

74HCT

+25

−40 to +85

−40 to +125

UNIT

VCC

(V)

min typ max min max. min. max.

WAVEFORMS

7

−

−

µs 4.5 CEXT = 1 nF;

REXT = 10 kΩ;

Fig.10

20 12

25

30

ns 4.5 Fig.9

2

1000 −

−

kΩ 5.0 Fig.13

CEXT

external timing capacitor no limits

pF 5.0 Fig.13

December 1990

10

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