’LS257B Switching Characteristics

From (Input)

Symbol

Parameter

To (Output)

Units

Min

Max

Min

Max

Propagation Delay Time

Data to

18

27

ns

Low to High Level Output

Output

Propagation Delay Time

Data to

18

27

ns

High to Low Level Output

Output

Propagation Delay Time

Select to

28

35

ns

Low to High Level Output

Output

Propagation Delay Time

Select to

35

42

ns

High to Low Level Output

Output

Output Enable Time

Output

15

27

ns

to High Level Output

Control to Y

Output Enable Time

Output

28

38

ns

to Low Level Output

Control to Y

Output Disable Time from

Output

26

ns

High Level Output (Note 1)

Control to Y

Output Disable Time from

Output

25

ns

Low Level Output (Note 1)

Control to Y

Note 1

Recommended Operating Conditions

Symbol

Parameter

DM54LS258B

DM74LS258B

Units

Min

Nom

Max

Min

Nom

Max

Supply Voltage

45

5

55

475

5

525

V

High Level Input Voltage

2

2

V

Low Level Input Voltage

07

08

V

High Level Output Current

b

1

b

26

mA

Low Level Output Current

12

24

mA

Free Air Operating Temperature

b

55

125

0

70

C

’LS258B Electrical Characteristics

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

Symbol

Parameter

Conditions

Min

Typ

Max

Units

(Note 1)

Input Clamp Voltage

b

15

V

High Level Output

DM54

24

34

V

Voltage

DM74

24

31

Low Level Output

DM54

025

04

Voltage

DM74

035

05

V

DM74

025

04

Input Current

Max

Select

02

mA

Input Voltage

Other

01

High Level Input

Select

40

m

A

Current

Other

20

3