DM74LS257BN 查看數據表（PDF） - Fairchild Semiconductor

零件编号

产品描述 (功能)

生产厂家

DM74LS257BN

3-STATE Quad 2-Data Selectors/Multiplexers

Fairchild Semiconductor 

Switching Characteristics

VCC = 5V and TA = 25°C

Symbol

Parameter

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

tPZH

Output Enable Time

to HIGH Level Output

tPZL

Output Enable Time

to LOW Level Output

tPHZ

Output Disable Time from

HIGH Level Output (Note 5)

tPLZ

Output Disable Time from

LOW Level Output (Note 5)

Note 5: CL = 5 pF

From (Input)

To (Output)

Data to Output

Data to Output

Select to Output

Select to Output

Output Control to Y

Output Control to Y

Output Control to Y

Output Control to Y

RL = 667Ω

CL = 45 pF

CL = 150 pF

Min

Max

Min

Max

18

27

18

27

28

35

35

42

15

27

28

38

28

25

Units

ns

ns

ns

ns

ns

ns

ns

ns

3

www.fairchildsemi.com

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