MC74LCX138DR2 datasheet(2/8 Pages) ONSEMI

Part #	MC74LCX138DR2

Description	Dual Low-Voltage CMOS 2-to-4 Decoder/Demultiplexer

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Manufacturer	ONSEMI [ON Semiconductor]

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MC74LCX139

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2

13

14

15

16

9

10

11

12

5

4

3

2

1

8

7

6

Ea

A1a

A0a

GND

A1b

A0b

Eb

VCC

Y0a

Y1a

Y2a

Y3a

Y0b

Y1b

Y2b

Y3b

Figure 1. Pin Assignment

TRUTH TABLE

Inputs

Outputs

E

A1

A0

Y0

Y1 Y2

Y3

HX

X

H

LL

L

H

LL

H

L

H

LH

L

H

L

H

LH

H

L

PIN NAMES

Function

Address Inputs

Enable Inputs

Outputs

Pins

A0n−A1n

En

Y0n−Y3n

Figure 2. IEC Logic Diagram

A0a

A1a

Ea

A0b

A1b

1

Eb

Y0a

Y1a

Y2a

Y3a

Y0b

Y1b

Y2b

Y3b

ACTIVE−LOW

OUTPUTS

ADDRESS

INPUTS

ACTIVE−LOW

OUTPUTS

3

2

ADDRESS

INPUTS

13

14

15

4

5

6

7

12

11

10

9

4

Figure 3. Logic Diagram

Y0a

Y1a

Y2a

Y3a

Y0b

Y1b

Y2b

Y3b

5

6

7

12

11

10

9

15

14

13

1

2

3

A1a

A0a

Ea

A1b

A0b

Eb

2

1

EN

X/Y

1

0

2

3

0

1

DMUX

1

0

2

3

G

0

3

15

14

13

1

2

3

A1a

A0a

Ea

A1b

A0b

Eb

Y0a

Y1a

Y2a

Y3a

Y0b

Y1b

Y2b

Y3b

4

5

6

7

12

11

10

9

En

A0

A1

Y0

Y1

Y2

Y3

Figure 4. Expanded Logic Diagram

(1/2 of Device)

H = High Voltage Level;

L = Low Voltage Level;

Z = High Impedance State

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MC74LCX138DR2 Datasheet(PDF) 2 Page - ON Semiconductor

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