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74VHCT138A Datasheet(PDF) 2 Page - STMicroelectronics

Part No. 74VHCT138A
Description  3 TO 8 LINE DECODER (INVERTING)
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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74VHCT138A
2/12
Figure 2: Input Equivalent Circuit
Table 2: Pin Description
Table 3: Truth Table
X : Don’t Care
Figure 3: Logic Diagram
This logic diagram has not be used to estimate propagation delays
PIN N°
SYMBOL
NAME AND FUNCTION
1, 2, 3
A, B, C
Address Inputs
4, 5
G2A, G2B
Enable Inputs
6
G1
Enable Input
15, 14, 13,
12, 11, 10, 9,
7
Y0 to Y7
Outputs
8
GND
Ground (0V)
16
VCC
Positive Supply Voltage
INPUTS
OUTPUTS
ENABLE
SELECT
G2B
G2A
G1
CBA
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
X
X
L
X
X
X
HHHHHHHH
X
H
XXXX
HHHHHHHH
H
XXXXX
HHHHHHHH
L
L
H
L
L
L
L
HHHHHHH
L
L
H
L
L
H
H
L
HHHHHH
L
L
H
L
H
L
HH
L
HHHHH
L
L
H
L
HH
HHH
L
HHHH
L
L
HH
L
L
HHHH
L
HHH
L
L
HH
L
H
HHHHH
L
H
H
L
L
HHH
L
HHHHHH
L
H
L
L
HHHH
HHHHHHH
L




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