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74HC221N 数据手册 - NXP（恩智浦）
制造商:
NXP（恩智浦）
分类:
触发器
封装:
DIP
描述:
NXP 74HC221N 芯片, 74HC CMOS逻辑器件
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74HC221N数据手册
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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
nR
D
nAnBnQnQ
LXXLH
XHXL
(2)
H
(2)
XXLL
(2)
H
(2)
HL↑
H↓H
↑LH
(3) (3)
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