JVC AX-M9000 Service Manual page 16

AX-M9000
TC74HC238AF-X(IC525) : Line recorder
1. Pin layout
A
B
C
G2A
G2B
G1
Y7
GND
2. Truth table
INPUTS
ENABLE
G1 G2A G2B C
L
X X X
H X X
X
X X
H X
L L
H L
L L
L
H
L L L
H
H L L L
L L H
H
H L L H
H
L L H
L L
H H
3. Block diagram
1
A
2
SELECT
B
INOUT
3
C
G2A
ENABLE
G2B
INPUTS
G1
1-16
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1
2
3
4
5
6
7
8
(TOP VIEW)
OUTPUTS
SELECT
Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7
A
B
X
X L L L
X X L L L
L L L
X X
L
L H L L
L H L
L
H
L L L H
H
H L L L
H
L L L L L
L
H
L L L
H L L L L
H L L L
H
X : Don't Care
4
5
6
16
Vcc
15
Y0
14
Y1
13 Y2
12
Y3
11
Y4
10
Y5
9 Y6
L L L L L
L L L L L
L L L L L
L L L L L
L L L L L
L L L L L
L L L L
H
L L L L
H
H
L L L L
L L L H
L
L L L L H
SELECTED OUTPUT
NONE
NONE
NONE
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
15
Y0
14
Y1
13
Y2
12
Y3
DATA
OUTPUTS
11
Y4
10
Y5
9
Y6
7
Y7