DM74ALS257 查看數據表（PDF） - Fairchild Semiconductor

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DM74ALS257

3-STATE Quad 1-of-2-Line Data Selector/Multiplexer

Fairchild Semiconductor 

Switching Characteristics DM74ALS257

over recommended operating free air temperature range

Symbol

Parameter

Conditions

tPLH

Propagation Delay Time

LOW-to-HIGH Level Output

tPHL

Propagation Delay Time

HIGH-to-LOW Level Output

tPLH

Propagation Delay Time

LOW-to-HIGH Level Output

tPHL

Propagation Delay Time

HIGH-to-LOW Level Output

tZH

Output Enable Time

to HIGH Level

tZL

Output Enable Time

to LOW Level

tHZ

Output Disable Time

from HIGH Level

tLZ

Output Disable Time

from LOW Level

VCC = 4.5V to 5.5V

CL = 50 pF

RL = 500Ω

Switching Characteristics DM74ALS258

over recommended operating free air temperature range

Symbol

Parameter

Conditions

tPLH

Propagation Delay Time

LOW-to-HIGH Level Output

tPHL

Propagation Delay Time

HIGH-to-LOW Level Output

tPLH

Propagation Delay Time

LOW-to-HIGH Level Output

tPHL

Propagation Delay Time

HIGH-to-LOW Level Output

tZH

Output Enable Time

to HIGH Level

tZL

Output Enable Time

to LOW Level

tHZ

Output Disable Time

from HIGH Level

tLZ

Output Disable Time

from LOW Level

VCC = 4.5V to 5.5V

CL = 50 pF

RL = 500Ω

From

To

Min

Max

Units

Data

Any Y

2

10

ns

Data

Any Y

2

12

ns

Select

Any Y

4

18

ns

Select

Any Y

5

Output

Any Y

4

Control

Output

Any Y

5

Control

Output

Any Y

2

Control

Output

Any Y

3

Control

22

ns

16

ns

18

ns

10

ns

15

ns

From

To

Min

Max

Units

Data

Any Y

2

8

ns

Data

Any Y

2

7

ns

Select

Any Y

3

20

ns

Select

Any Y

5

Output

Any Y

5

Control

Output

Any Y

5

Control

Output

Any Y

2

Control

Output

Any Y

3

Control

25

ns

18

ns

18

ns

10

ns

18

ns

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