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74HC221 데이터시트(PDF) 4 Page - NXP Semiconductors

부품명 74HC221
상세설명  Dual non-retriggerable monostable multivibrator with reset
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제조업체  PHILIPS [NXP Semiconductors]
홈페이지  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

74HC221 데이터시트(HTML) 4 Page - NXP Semiconductors

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December 1990
4
Philips Semiconductors
Product specification
Dual non-retriggerable monostable
multivibrator with reset
74HC/HCT221
Fig.4 Functional diagram.
FUNCTION TABLE
Notes
1. H = HIGH voltage level
L = LOW voltage level
X = don’t care
↑ = LOW-to-HIGH level
↓ = HIGH-to-LOW level
= one HIGH-level output pulse
= one LOW-level output pulse
2. If the monostable was triggered before this condition
was established the pulse will continue as
programmed.
3. For this combination the reset input must be LOW and
the following sequence must be used:
pin 1 (or 9) must be set HIGH or pin 2 (or 10) set LOW;
then pin 1 (or 9) must be LOW and pin 2 (or 10) set
HIGH. Now the reset input goes from LOW-to-HIGH
and the device will be triggered.
INPUTS
OUTPUTS
nRD
nAnB
nQ
nQ
LX
X
L
H
XH
X
L (2)
H (2)
XX
L
L (2)
H (2)
HL
H
H
LH
(3)
(3)


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