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SN74LS221 Datasheet(PDF) 2 Page - ON Semiconductor

Part No. SN74LS221
Description  LOW POWER SCHOTTKY
Download  8 Pages
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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 2 page
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SN74LS221
http://onsemi.com
2
(TOP VIEW)
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.
14
13
12
11
10
9
12345
6
7
16
15
8
VCC
1A
1 Rext/
Cext
1
Cext
1Q
2Q
2B
2
CLR
2A
1B
1
CLR
1Q
2Q
2
Cext
2 Rext/
Cext
GND
Q
Q
CLR
Q
Q
CLR
+
VCC
Rext
R/C
Cext
FUNCTION TABLE
(EACH MONOSTABLE)
INPUTS
OUTPUTS
CLEAR
A
B
Q
Q
L
X
X
L
H
X
H
XL
H
X
X
LL
H
H
L
°
H
±
H
*
°
L
H
*See operational notes — Pulse Trigger Modes
TYPE
TYPICAL
POWER
MAXIMUM
OUTPUT PULSE
DISSIPATION
LENGTH
SN74LS221
23 mW
70 s




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