SN74LS138

http://onsemi.com

5

DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)

Limits

Symbol

Parameter

Min

Typ

Max

Unit

Test Conditions

Input HIGH Voltage

2.0

V

Guaranteed Input HIGH Voltage for

All Inputs

Input LOW Voltage

0.8

V

Guaranteed Input LOW Voltage for

All Inputs

Input Clamp Diode Voltage

– 0.65

– 1.5

V

Output HIGH Voltage

2.7

3.5

V

Output LOW Voltage

0.25

0.4

V

Output LOW Voltage

0.35

0.5

V

per Truth Table

I

Input HIGH Current

20

µA

Input HIGH Current

0.1

mA

Input LOW Current

– 0.4

mA

Short Circuit Current (Note 1)

–20

–100

mA

Power Supply Current

10

mA

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

Levels of

Limits

Symbol

Parameter

Levels of

Delay

Min

Typ

Max

Unit

Test Conditions

Propagation Delay

Address to Output

2

2

13

27

20

41

ns

Propagation Delay

Address to Output

3

3

18

26

27

39

ns

Enable to Output

2

2

12

21

18

32

ns

CC

Enable to Output

3

3

17

25

26

38

ns

AC WAVEFORMS

Figure 1.

Figure 2.

1.3 V

1.3 V

1.3 V

1.3 V

1.3 V

1.3 V

1.3 V

1.3 V