HD74LS155 데이터 시트보기 (PDF) - Renesas Electronics

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HD74LS155

Dual 2-line-to-4-line Decoders / Demultiplexers

Renesas Electronics 

HD74LS155

Switching Characteristics

(VCC = 5 V, Ta = 25°C)

Item

Symbol

Inputs

Output

Levels

of logic

min.

typ.

max.

Unit Condition

tPLH

A, B, 2C

Y

2

—

10

15

ns

tPHL

1G or 2G

—

19

30

ns

Propagation

tPLH

A or B

Y

delay time

tPHL

3

—

17

26

ns

CL = 15 pF,

—

19

30

ns

RL = 2 kΩ

tPLH

1C

Y

3

—

18

27

ns

tPHL

—

18

27

ns

Testing Method

Test Circuit

4.5V

P.G.

Zout = 50Ω

Input

VCC Output

RL Load circuit 1

1Y0

CL

1G

Output

1C

1Y1

Same as Load Circuit 1.

B

Output

A

1Y2

Same as Load Circuit 1.

Output

2C

1Y3

Same as Load Circuit 1.

2G

Output

2Y0

Same as Load Circuit 1.

Output

2Y1

Same as Load Circuit 1.

Output

2Y2

Same as Load Circuit 1.

Output

2Y3

Same as Load Circuit 1.

Notes: 1. CL includes probe and jig capacitance.

2. All diodes are 1S2074(H).

Rev.2.00, Feb.18.2005, page 4 of 6

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