參數(shù)資料
型號： 74HC221
廠商： NXP Semiconductors N.V.
英文描述： Dual non-retriggerable monostable multivibrator with reset
中文描述： 雙非retriggerable帶復(fù)位單穩(wěn)態(tài)觸發(fā)器
文件頁數(shù)： 4/15頁
文件大?。?/td> 250K
代理商： 74HC221
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
If the monostable was triggered before this condition
was established the pulse will continue as
programmed.
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.
2.
3.
INPUTS
OUTPUTS
nR
D
L
X
X
H
H
↑
nA
nB
nQ
nQ
X
H
X
L
↓
L
X
X
L
↑
H
H
L
L
(2)
L
(2)
H
H
(2)
H
(2)
(3)
(3)
相關(guān)PDF資料
PDF描述
74221 Dual non-retriggerable monostable multivibrator with reset
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74221 High Speed CMOS Logic Dual Monostable Multivibrator with Reset
74221 Dual Non-Retriggerable Monostable Multivibrator
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