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SN74LS221 Datasheet(PDF) 4 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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SN74LS221
http://onsemi.com
4
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol
Parameter
Min
Typ
Max
Unit
Test Conditions
VT+
Positive-Going Threshold
Voltage at C Input
1.0
2.0
V
VCC = MIN
VT–
Negative-Going Threshold
Voltage at C Input
0.7
0.8
V
VCC = MIN
VT+
Positive-Going Threshold
Voltage at B Input
1.0
2.0
V
VCC = MIN
VT–
Negative-Going Threshold
Voltage at B Input
0.8
0.9
V
VCC = MIN
VIH
Input HIGH Voltage
2.0
V
Guaranteed Input HIGH Voltage for
A Input
VIL
Input LOW Voltage
0.8
V
Guaranteed Input LOW Voltage for
A Input
VIK
Input Clamp Voltage
– 1.5
V
VCC = MIN, IIN = – 18 mA
VOH
Output HIGH Voltage
2.7
3.4
V
VCC = MIN, IOH = MAX
VOL
Output LOW Voltage
0.35
0.5
V
IOL = 8.0 mA
VCC = MIN
I
Input HIGH Current
20
µA
VCC = MAX, VIN = 2.7 V
IIH
Input HIGH Current
0.1
mA
VCC = MAX, VIN = 7.0 V
IIL
Input LOW Current
Input A
Input B
Clear
– 0.4
– 0.8
– 0.8
mA
VCC = MAX, VIN = 0.4 V
IOS
Short Circuit Current (Note 1)
–20
– 100
mA
VCC = MAX
ICC
Power Supply Current
Quiescent
4.7
11
mA
VCC = MAX
CC
Triggered
19
27
CC
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.




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