SN74LS251

http://onsemi.com

4

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

2.4

3.1

V

Output LOW Voltage

0.25

0.4

V

Output LOW Voltage

0.35

0.5

V

per Truth Table

Output Off Current HIGH

20

µA

Output Off Current LOW

–20

µA

I

Input HIGH Current

20

µA

Input HIGH Current

0.1

mA

Input LOW Current

– 0.4

mA

Short Circuit Current (Note 1)

–30

– 130

mA

Power Supply Current

10

mA

Power Supply Current

12

mA

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

Limits

Symbol

Parameter

Min

Typ

Max

Unit

Test Conditions

Propagation Delay,

Select to Z Output

20

21

33

33

ns

Figure 1

Propagation Delay,

Select to Z Output

29

28

45

45

ns

Figure 2

Propagation Delay,

Data to Z Output

10

9.0

15

15

ns

Figure 1

Propagation Delay,

Data to Z Output

17

18

28

28

ns

Figures 2

L

Output Enable Time

to Z Output

17

24

27

40

ns

Figures 4, 5

Output Enable Time

to Z Output

30

26

45

40

ns

Figures 3, 5

Output Disable Time

to Z Output

37

15

55

25

ns

Figures 3, 5

Output Disable Time

to Z Output

30

15

45

25

ns

Figures 4, 5

L