Integra DTR-8.8 Service Manual page 137
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- Instruction manual (144 pages) ,
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- Service manual (314 pages)
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IC BLOCK DIAGRAMS AND TERMINAL DESCRIPTIONS -71
Q7172: TC74VHC138FT (3-8 Line Decoder)
BLOCK DIAGRAM
TE
L 13942296513
ENABLE INPUTS
G1
X
X
L
H
H
H
H
H
H
H
H
PIN CONFIGURATION
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1
A
2
Select
B
Inputs
3
C
4
G2A
5
Enable
G2B
Inputs
6
G1
SELECT INPUTS
G2A
G2B
C
B
H
X
X
X
X
H
X
X
X
X
X
X
L
L
L
L
L
L
L
L
L
L
L
H
L
L
L
H
L
L
H
L
L
L
H
L
L
L
H
H
L
L
H
H
A
1
16
B
2
15
C
3
14
G2A
4
13
x
ao
u163
y
G2B
5
12
6
G1
i
7
10
Y7
8
GND
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8
Q Q
3
6 7
1 3
Logic Diagram
A
Y0
Y1
Y2
X
H
H
H
X
H
H
H
X
H
H
H
L
L
H
H
H
H
L
H
L
H
H
L
H
H
H
H
L
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
V
CC
Y0
Y1
Y2
Y3
11
Y4
.
Y5
9
Y6
TX-NR905/NA905
2 9
9 4
2 8
15
Y0
14
Y1
13
Y2
12
Y3
Data
Outputs
11
Y4
10
Y5
9
Y6
7
Y7
1 5
0 5
8
2 9
9 4
OUTPUTS
Y3
Y4
Y5
Y6
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
L
H
H
H
L
H
H
H
H
H
H
m
co
9 9
2 8
9 9
Y7
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
L
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