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74VHCT138 Datasheet(PDF) 2 Page - STMicroelectronics

Part No. 74VHCT138
Description  3 TO 8 LINE DECODER INVERTING
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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INPUT EQUIVALENT CIRCUIT
LOGIC DIAGRAM
PIN DESCRIPTION
PIN No
SYMBOL
NAME AND FUNCT ION
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
TRUTH TABLE
INPUT S
OUTPUTS
ENABL E
SELECT
G2B
G2A
G 1
C
B
A
Y0Y1Y2Y3
Y4
Y5Y6Y7
X
X
L
X
X
X
HHHHH
H
H
H
X
H
X
X
X
X
HHHHH
H
H
H
H
X
X
X
X
X
HHHHH
H
H
H
L
L
H
L
L
L
L
HHHH
H
H
H
L
L
HL
LH
HLH
H
H
H
H
H
L
L
HLHL
H
H
LH
H
H
H
H
L
L
H
L
HH
HHH
L
H
H
H
H
L
L
HH
L
L
HHHH
L
H
H
H
L
L
HH
L
H
HHHHH
L
H
H
L
L
HHH
L
HHHHH
H
L
H
L
L
HHHH
HHHHH
H
H
L
X:Donā€™t Care
Thislogic diagram has notbe used to estimate propagation delays
74VHCT138A
2/8




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