SN74LS221

http://onsemi.com

4

Limits

Symbol

Parameter

Min

Typ

Max

Unit

Test Conditions

Positive-Going Threshold

Voltage at C Input

1.0

2.0

V

Negative-Going Threshold

Voltage at C Input

0.7

0.8

V

Positive-Going Threshold

Voltage at B Input

1.0

2.0

V

Negative-Going Threshold

Voltage at B Input

0.8

0.9

V

Input HIGH Voltage

2.0

V

Guaranteed Input HIGH Voltage for

A Input

Input LOW Voltage

0.8

V

Guaranteed Input LOW Voltage for

A Input

Input Clamp Voltage

– 1.5

V

Output HIGH Voltage

2.7

3.4

V

Output LOW Voltage

0.35

0.5

V

I

Input HIGH Current

20

µA

Input HIGH Current

0.1

mA

Input LOW Current

Input A

Input B

Clear

– 0.4

– 0.8

– 0.8

mA

Short Circuit Current (Note 1)

–20

– 100

mA

Power Supply Current

Quiescent

4.7

11

mA

CC

Triggered

19

27

CC

Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.