HD74LS138 데이터 시트보기 (PDF) - Renesas Electronics

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HD74LS138

3-Line-to-8-Line Decoders / Demultiplexers

Renesas Electronics 

HD74LS138

Function Table

Enable

Inputs

Select

Outputs

G1

G2*

C

B

A

Y0

Y1

Y2

Y3

Y4

Y5

Y6

Y7

X

H

X

X

X

H

H

H

H

H

H

H

H

L

X

X

X

X

H

H

H

H

H

H

H

H

H

L

L

L

L

L

H

H

H

H

H

H

H

H

L

L

L

H

H

L

H

H

H

H

H

H

H

L

L

H

L

H

H

L

H

H

H

H

H

H

L

L

H

H

H

H

H

L

H

H

H

H

H

L

H

L

L

H

H

H

H

L

H

H

H

H

L

H

L

H

H

H

H

H

H

L

H

H

H

L

H

H

L

H

H

H

H

H

H

L

H

H

L

H

H

H

H

H

H

H

H

H

H

L

H ; high level, L ; low level, X ; irrelevant

* ; G2 = G2A + G2B

Block Diagram

G1

Enable

Inputs G2A

G2B

A

Select

Inputs

B

C

Y0

Y1

Y2

Y3

Data

Outputs

Y4

Y5

Y6

Y7

Absolute Maximum Ratings

Item

Symbol

Ratings

Supply voltage

VCC

7

Input voltage

VIN

7

Power dissipation

PT

400

Storage temperature

Tstg

–65 to +150

Note: Voltage value, unless otherwise noted, are with respect to network ground terminal.

Recommended Operating Conditions

Item

Supply voltage

Output current

Operating temperature

Symbol

VCC

IOH

IOL

Topr

Min

4.75

—

—

–20

Typ

5.00

—

—

25

Max

5.25

–400

8

75

Unit

V

V

mW

°C

Unit

V

µA

mA

°C

Rev.3.00, Jul.13.2005, page 2 of 7

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