SN74LS138

http://onsemi.com

4

DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)

Limits

Symbol

Parameter

Min

Typ

Max

Unit

Test Conditions

VIH

Input HIGH Voltage

2.0

V

Guaranteed Input HIGH Voltage for

All Inputs

VIL

Input LOW Voltage

0.8

V

Guaranteed Input LOW Voltage for

All Inputs

VIK

Input Clamp Diode Voltage

–0.65

–1.5

V

VCC = MIN, IIN = –18 mA

VOH

Output HIGH Voltage

2.7

3.5

V

VCC = MIN, IOH = MAX, VIN = VIH

or VIL per Truth Table

VOL

Output LOW Voltage

0.25

0.4

V

IOL = 4.0 mA

VCC = VCC MIN,

VIN VIL or VIH

VOL

Output LOW Voltage

0.35

0.5

V

IOL = 8.0 mA

VIN = VIL or VIH

per Truth Table

IIH

Input HIGH Current

20

µA

VCC = MAX, VIN = 2.7 V

IIH

Input HIGH Current

0.1

mA

VCC = MAX, VIN = 7.0 V

IIL

Input LOW Current

–0.4

mA

VCC = MAX, VIN = 0.4 V

IOS

Short Circuit Current (Note 2)

–20

–100

mA

VCC = MAX

ICC

Power Supply Current

10

mA

VCC = MAX

2. 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

tPLH

tPHL

Propagation Delay

Address to Output

2

2

13

27

20

41

ns

tPLH

tPHL

Propagation Delay

Address to Output

3

3

18

26

27

39

ns

VCC = 5.0 V

tPLH

tPHL

Propagation Delay E1 or E2

Enable to Output

2

2

12

21

18

32

ns

VCC = 5.0 V

CL = 15 pF

tPLH

tPHL

Propagation Delay E3

Enable to Output

3

3

17

25

26

38

ns

AC WAVEFORMS

Figure 1.

Figure 2.

VIN

VOUT

1.3 V

tPHL

1.3 V

1.3 V

1.3 V

tPLH

VIN

VOUT

1.3 V

tPHL

1.3 V

tPLH

1.3 V

1.3 V