DM74AS257M 查看數據表（PDF） - Fairchild Semiconductor

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DM74AS257M

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

Fairchild Semiconductor 

DM74AS257 Switching Characteristics

Over recommended operating free air temperature range.

Symbol

Parameter

Conditions

From

To Min Max Units

tPLH Propagation Delay Time,

LOW-to-HIGH Level Output

tPHL Propagation Delay Time,

HIGH-to-LOW Level Output

VCC = 4.5V to 5.5V,

Data

Any Y

1

CL = 50 pF,

RL = 500Ω

1

5.5

ns

6

ns

tPLH Propagation Delay Time,

LOW-to-HIGH Level Output

Select Any Y

2

11

ns

tPHL Propagation Delay Time,

HIGH-to-LOW Level Output

2

10

ns

tPZH Output Enable Time to HIGH

Level

OUTPUT Any Y

2

Control

7.5

ns

tPZL Output Enable Time to LOW

Level

2

9.5

ns

tPHZ Output Disable Time from HIGH

Level

OUTPUT Any Y 1.5

6.5

ns

Control

tPLZ Output Disable Time from LOW

Level

2

7

ns

DM74AS258 Switching Characteristics

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

VCC = 4.5V to 5.5V,

CL = 50pF,

RL = 500Ω

tPLH Propagation Delay Time,

LOW-to-HIGH Level Output

tPHL Propagation Delay Time,

HIGH-to-LOW Level Output

tPZH Output Enable Time to HIGH

Level

tPZL Output Enable Time to LOW

Level

tPHZ Output Disable Time, from HIGH

Level

tPLZ Output Disable Time from LOW

Level

From

Data

Select

OUTPUT

Control

OUTPUT

Control

To

Any Y

Any Y

Any Y

Any Y

Min. Max. Units

1

5

ns

1

4

ns

2

9.5

ns

2

10

ns

2

8

ns

2

10

ns

1.5

6

ns

2

6.5

ns

©1986 Fairchild Semiconductor Corporation

DM74AS257, DM74AS258 Rev. 1.2

5

www.fairchildsemi.com

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