74LCX139(2004) 查看數據表（PDF） - STMicroelectronics

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74LCX139
(Rev.:2004)

LOW VOLTAGE CMOS DUAL 2 TO 4 DECODER/DEMULTIPLEXER

STMicroelectronics 

74LCX139

Figure 2: Input And Output Equivalent Circuit

Table 2: Pin Description

PIN N°

1, 15

2, 3

4, 5, 6, 7

12, 11, 10, 9

14, 13

8

16

Table 3: Truth Table

ENABLE

G

H

L

L

L

L

X : Don’t Care

INPUTS

SELECT

B

A

X

X

L

L

L

H

H

L

H

H

SYMBOL

1G, 2G

1A, 1B

1Y0 to 1Y3

2Y0 to 2Y3

2A, 2B

GND

VCC

NAME AND FUNCTION

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

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