SN74LS221 データシートの表示（PDF） - ON Semiconductor
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SN74LS221 Datasheet PDF : 7 Pages
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SN74LS221
(TOP VIEW)
1 Rext/ 1
2
Cext Cext
CLR
VCC
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 Rext/ GND
CLR
Cext
Cext
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.
VCC
Rext
+
Cext
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
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