HD74LS257FP 查看數據表（PDF） - Renesas Electronics

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HD74LS257FP

Quadruple 2-line-to-1-line Data Selectors / Multiplexers (with not inverted 3-state outputs)

Renesas Electronics 

HD74LS257

Electrical Characteristics

(Ta = –20 to +75 °C)

Item

Symbol min. typ.* max. Unit

Condition

Input voltage

Output voltage

S

S except

VIH

2.0

—

—

V

VIL

—

—

0.8

V

VOH

2.4

—

—

V

VCC = 4.75 V, VIH = 2 V, VIL = 0.8 V,

IOH = –2.6 mA

VOL

—

—

0.5

V

IOL = 8 mA VCC = 4.75 V, VIH = 2 V,

—

—

0.4

IOL = 4 mA VIL = 0.8 V

—

—

40

IIH

—

—

20

µA VCC = 5.25 V, VI = 2.7 V

Input

current

S

S except

—

—

–0.8

IIL

—

—

–0.4

mA VCC = 5.25 V, VI = 0.4 V

S

S except

—

—

0.2

II

—

—

0.1

mA VCC = 5.25 V, VI = 7 V

Output current

IOZ

Short-circuit output current

IOS

All outputs high

Supply

current** All outputs low

ICC

All outputs off

—

—

—

—

20

–20

µA

VO = 2.4 V

VO = 0.4 V

VCC = 5.25 V, VIH = 2 V

–30

—

–130

mA VCC = 5.25 V

—

5.9

10

—

9.2

16

mA VCC = 5.25 V

—

10

19

Input clamp voltage

VIK

—

—

–1.5

V

VCC = 4.75 V, IIN = –18 mA

Notes: * VCC = 5 V, Ta = 25°C

** ICC is measured with all outputs open and all possible inputs grounded while achieving the stated output

conditions.

Switching Characteristics

(VCC = 5 V, Ta = 25°C)

Item

Symbol Inputs Output

min.

typ.

max.

Unit

Condition

tPLH

A, B

Y

Propagation delay time

tPHL

tPLH

S

Y

tPHL

—

12

18

ns

—

12

18

—

—

14

14

21

21

ns

CL = 15 pF,

RL = 2 kΩ

Output enable time

tZH

OC

Y

tZL

—

20

30

ns

—

20

30

Output disable time

tHZ

OC

Y

tLZ

—

—

18

16

30

25

ns

CL = 5 pF,

RL = 2 kΩ

Rev.3.00, Jul.15.2005, page 3 of 5

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