MC74VHCT139A Ver la hoja de datos (PDF) - ON Semiconductor

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MC74VHCT139A

Dual 2−to−4 Decoder/Demultiplexer

ON Semiconductor 

Ea 1

A0a 2

A1a 3

Y0a 4

Y1a 5

Y2a 6

Y3a 7

GND 8

16 VCC

15 Eb

14 A0b

13 A1b

12 Y0b

11 Y1b

10 Y2b

9 Y3b

Figure 1. Pin Assignment

MC74VHCT139A

ADDRESS

INPUTS

A0a 2

A1a 3

Ea 1

4 Y0a

5 Y1a

6 Y2a

7 Y3a

ACTIVE−LOW

OUTPUTS

ADDRESS

INPUTS

A0b 14

A1b 13

12 Y0b

11 Y1b

10 Y2b

9 Y3b

ACTIVE−LOW

OUTPUTS

Eb 15

Figure 2. Logic Diagram

En

Y0

Y1

A0

Y2

Y3

A1

Figure 3. Expanded Logic Diagram

(1/2 of Device)

INPUT

Figure 4. Input Equivalent Circuit

A1a 3

A0a 2

Ea 1

A1b 13

A0b 14

Eb 15

X/Y

1

0

2

1

EN

2

3

4 Y0a

5 Y1a

6 Y2a

7 Y3a

12 Y0b

11 Y1b

10 Y2b

9 Y3b

A1a 3

A0a 2

Ea 1

A1b 13

A0b 14

Eb 15

DMUX

0

1

G

0

3

0

1

2

3

4 Y0a

5 Y1a

6 Y2a

7 Y3a

12 Y0b

11 Y1b

10 Y2b

9 Y3b

Figure 5. IEC Logic Diagram

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