3

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Note 2: The “Absolute Maximum Ratings” are those values beyond which

the safety of the device cannot be guaranteed. The device should not be

operated at these limits. The parametric values defined in the Electrical

Characteristics tables are not guaranteed at the absolute maximum ratings.

The “Recommended Operating Conditions” table will define the conditions

for actual device operation.

DM74LS138 Recommended Operating Conditions

DM74LS138 Electrical Characteristics

over recommended operating free air temperature range (unless otherwise noted)

Note 4: Not more than one output should be shorted at a time, and the duration should not exceed one second.

DM74LS138 Switching Characteristics

Supply Voltage

7V

Input Voltage

7V

Operating Free Air Temperature Range

0

°C to +70°C

Storage Temperature Range

−65°C to +150°C

Symbol

Parameter

Min

Nom

Max

Units

Supply Voltage

4.75

5

5.25

V

HIGH Level Input Voltage

2

V

LOW Level Input Voltage

0.8

V

HIGH Level Output Current

−0.4

mA

LOW Level Output Current

8

mA

Free Air Operating Temperature

0

70

°C

Symbol

Parameter

Conditions

Min

Typ

Max

Units

(Note 3)

Input Clamp Voltage

−1.5

V

HIGH Level Output Voltage

2.7

3.4

V

LOW Level

0.35

0.5

V

Output Voltage

0.25

0.4

Input Current @ Max Input Voltage

0.1

mA

HIGH Level Input Current

20

µA

LOW Level Input Current

−0.36

mA

Short Circuit Output Current

−20

−100

mA

Supply Current

6.3

10

mA

From (Input)

Levels

Symbol

Parameter

To (Output)

of Delay

Units

Min

Max

Min

Max

Propagation Delay Time

Select to Output

2

18

27

ns

LOW-to-HIGH Level Output

Propagation Delay Time

Select to Output

2

27

40

ns

HIGH-to-LOW Level Output

Propagation Delay Time

Select to Output

3

18

27

ns

LOW-to-HIGH Level Output

Propagation Delay Time

Select to Output

3

27

40

ns

HIGH-to-LOW Level Output

Propagation Delay Time

Enable to Output

2

18

27

ns

LOW-to-HIGH Level Output

Propagation Delay Time

Enable to Output

2

24

40

ns

HIGH-to-LOW Level Output

Propagation Delay Time

Enable to Output

3

18

27

ns

LOW-to-HIGH Level Output

Propagation Delay Time

Enable to Output

3

28

40

ns

HIGH-to-LOW Level Output