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零件编号
产品描述 (功能)
SN74LS221 查看數據表(PDF) - ON Semiconductor
零件编号
产品描述 (功能)
生产厂家
SN74LS221
Dual Monostable Multivibrators with Schmitt−Trigger Inputs
ON Semiconductor
SN74LS221 Datasheet PDF : 7 Pages
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SN74LS221
(TOP VIEW)
1 Rext/ 1
2
Cext Cext
CLR
V
CC
1Q 2Q
2B 2A
16 15 14 13 12 11 10 9
Q
Q
CLR
CLR
Q
Q
1 2 3 4 56 78
1A 1B
1
1Q 2Q
2
2 R
ext
/
GND
CLR
C
ext
C
ext
Positive logic: Low input to clear resets Q low and
Positive logic:
Q high regardless of dc levels at A
Positive logic:
or B inputs.
V
CC
R
ext
+
C
ext
R/C
FUNCTION TABLE
(EACH MONOSTABLE)
INPUTS
OUTPUTS
CLEAR A B
Q
Q
L
XX
L
H
X
HX
L
H
X
XL
L
H
H
L
°
H
±
H
*
°
LH
*See operational notes — Pulse Trigger Modes
TYPE
SN74LS221
TYPICAL
POWER
DISSIPATION
23 mW
MAXIMUM
OUTPUT PULSE
LENGTH
70 s
http://onsemi.com
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