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SN74LS221 Datasheet(PDF) 6 Page - ON Semiconductor

Part No. SN74LS221
Description  LOW POWER SCHOTTKY
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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 6 page
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SN74LS221
http://onsemi.com
6
AC WAVEFORMS
B INPUT
CLEAR
Q OUTPUT
Q OUTPUT
A INPUT IS LOW.
B INPUT
CLEAR
Q OUTPUT
A INPUT IS LOW.
B INPUT
CLEAR
Q OUTPUT
A INPUT IS LOW.
tW(in)
≥60 ns
tPLH
tPHL
tPLH
tPHL
1.3 V
3 V
0 V
3 V
0 V
VOH
VOL
VOH
VOL
≥60 ns
1.3 V
1.3 V
3 V
0 V
3 V
0 V
VOH
VOL
≥ 50 ns
≥ 0
ts
3 V
0 V
3 V
0 V
VOH
VOL
3 V
0 V
3 V
0 V
VOH
VOL
TRIGGERED
NOT TRIGGERED
≥50 ns
≥50 ns
B INPUT
CLEAR
Q OUTPUT
A INPUT IS LOW.
tW(out)
TRIGGER FROM B, THEN CLEAR — CONDITION 1
TRIGGER FROM B, THEN CLEAR — CONDITION 2
CLEAR OVERRIDING B, THEN TRIGGER FROM B
TRIGGERING FROM POSITIVE TRANSITION OF CLEAR
Figure 1.




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