74VHC139T データシートの表示（PDF） - STMicroelectronics
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74VHC139T Datasheet PDF : 8 Pages
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74VHC139
INPUT EQUIVALENT CIRCUIT
TRUTH TABLE
E NA BL E
G
H
L
L
L
L
X:Don’t Care
IN PUT S
SELECT
B
A
X
X
L
L
L
H
H
L
H
H
LOGIC DIAGRAM
PIN DESCRIPTION
PIN No
1, 15
2, 3
4, 5, 6, 7
12, 11, 10,
9
14, 13
8
16
SYMBOL NAME AND FUNCT ION
1G, 2G Enable Inputs
1A, 1B Address Inputs
1Y0 to 1Y3 Outputs
2Y0 to 2Y3 Outputs
2A, 2B
GND
VCC
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
Thislogic diagram has notbe used to estimate propagation delays
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