74VHC139TTR(2004) 查看數據表（PDF） - STMicroelectronics

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74VHC139TTR
(Rev.:2004)

DUAL 2 TO 4 DECODER/DEMULTIPLEXER

STMicroelectronics 

74VHC139

Figure 2: Input Equivalent Circuit

Table 3: Truth Table

INPUTS

ENABLE

SELECT

G

B

A

H

X

X

L

L

L

L

L

H

L

H

L

L

H

H

X : Don’t care

Figure 3: Logic Diagram

Table 2: Pin Description

PIN N°

1, 15

2, 3

4, 5, 6, 7

12, 11, 10, 9

14, 13

8

16

SYMBOL NAME AND FUNCTION

1G, 2G

1A, 1B

1Y0 to 1Y3

2Y0 to 2Y3

2A, 2B

GND

VCC

Enable Inputs

Address Inputs

Outputs

Outputs

Address Inputs

Ground (0V)

Positive Supply Voltage

OUTPUTS

Y0

Y1

Y2

Y3

H

H

H

H

L

H

H

H

H

L

H

H

H

H

L

H

H

H

H

L

This logic diagram has not be used to estimate propagation delays

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