Absolute Maximum Ratings(Note 2)

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 3: All typicals are at VCC = 5V, TA = 25°C.

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

Note 5: ICC is measured with all outputs enabled and OPEN.

DM74LS138 Switching Characteristics

at VCC = 5V and TA = 25°C

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

VCC

Supply Voltage

4.75

5

5.25

V

VIH

HIGH Level Input Voltage

2

V

VIL

LOW Level Input Voltage

0.8

V

IOH

HIGH Level Output Current

−0.4

mA

IOL

LOW Level Output Current

8

mA

TA

Free Air Operating Temperature

0

70

°C

Symbol

Parameter

Conditions

Min

Typ

Max

Units

(Note 3)

VI

Input Clamp Voltage

VCC = Min, II = −18 mA

−1.5

V

VOH

HIGH Level Output Voltage

VCC = Min, IOH = Max, VIL = Max, VIH = Min

2.7

3.4

V

VOL

LOW Level

VCC = Min, IOL = Max, VIL = Max, VIH = Min

0.35

0.5

V

Output Voltage

IOL = 4 mA, VCC = Min

0.25

0.4

II

Input Current @ Max Input Voltage

VCC = Max, VI = 7V

0.1

mA

IIH

HIGH Level Input Current

VCC = Max, VI = 2.7V

20

µA

IIL

LOW Level Input Current

VCC = Max, VI = 0.4V

−0.36

mA

IOS

Short Circuit Output Current

VCC = Max (Note 4)

−20

−100

mA

ICC

Supply Current

VCC = Max (Note 5)

6.3

10

mA

From (Input)

Levels

RL = 2 kΩ

Symbol

Parameter

To (Output)

of Delay

CL = 15 pF

CL = 50 pF

Units

Min

Max

Min

Max

tPLH

Propagation Delay Time

Select to Output

2

18

27

ns

LOW-to-HIGH Level Output

tPHL

Propagation Delay Time

Select to Output

2

27

40

ns

HIGH-to-LOW Level Output

tPLH

Propagation Delay Time

Select to Output

3

18

27

ns

LOW-to-HIGH Level Output

tPHL

Propagation Delay Time

Select to Output

3

27

40

ns

HIGH-to-LOW Level Output

tPLH

Propagation Delay Time

Enable to Output

2

18

27

ns

LOW-to-HIGH Level Output

tPHL

Propagation Delay Time

Enable to Output

2

24

40

ns

HIGH-to-LOW Level Output

tPLH

Propagation Delay Time

Enable to Output

3

18

27

ns

LOW-to-HIGH Level Output

tPHL

Propagation Delay Time

Enable to Output

3

28

40

ns

HIGH-to-LOW Level Output

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