SN74LS221
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE
(unless otherwise specified)
Limits
Symbol
V
T+
V
T–
Parameter
Positive-Going Threshold
Voltage at C Input
Negative-Going Threshold
Voltage at C Input
Positive-Going Threshold
Voltage at B Input
Negative-Going Threshold
Voltage at B Input
Input HIGH Voltage
Input LOW Voltage
Input Clamp Voltage
Output HIGH Voltage
Output LOW Voltage
Input HIGH Current
0.1
Input LOW Current
Input A
Input B
Clear
Short Circuit Current (Note 1)
Power Supply Current
Quiescent
Triggered
– 20
4.7
19
– 0.4
– 0.8
– 0.8
– 100
11
27
2.7
3.4
0.35
0.5
20
I
IH
0.8
0.7
Min
Typ
1.0
0.8
Max
2.0
Unit
V
V
V
CC
= MIN
V
CC
= MIN
V
CC
= MIN
V
CC
= MIN
Guaranteed Input HIGH Voltage for
A Input
Guaranteed Input LOW Voltage for
A Input
V
CC
= MIN, I
IN
= – 18 mA
V
CC
= MIN, I
OH
= MAX
I
OL
= 8.0 mA
V
CC
= MIN
Test Conditions
V
T+
V
T–
1.0
0.9
2.0
V
V
V
IH
V
IL
V
IK
V
OH
V
OL
2.0
0.8
– 1.5
V
V
V
V
V
µA
mA
V
CC
= MAX, V
IN
= 2.7 V
V
CC
= MAX, V
IN
= 7.0 V
I
IL
mA
V
CC
= MAX, V
IN
= 0.4 V
I
OS
I
CC
mA
V
CC
= MAX
V
CC
= MAX
mA
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
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