Truth Table; System Diagram - Onkyo TX-SR606 Service Manual

IC BLOCK DIAGRAMS AND TERMINAL DESCRIPTIONS-31
Q8002, Q8003 : TC74VCX162244FT
(Low-Voltage 16-Bit Bus Buffer with 3.6-V Tolerant Inputs and Outputs)
PIN LAYOUT
1OE 1
2
1Y1
1Y2 3
4
GND
1Y3 5
6
1Y4
VCC 7
8
2Y1
2Y2 9
10
GND
2Y3 11
12
2Y4
3Y1 13
14
3Y2
GND 15
16
3Y3
3Y4 17
18
VCC
4Y1 19
4Y2 20
GND 21
4Y3 22
4Y4 23
4OE 24

TRUTH TABLE

Inputs
1OE 1A1-1A4
L L
L H
H X
Inputs
2OE 2A1-2A4
L L
L H
H X
Inputs
3OE 3A1-3A4
L L
L H
H X
Inputs
4OE 4A1-4A4
L L
L H
H X
X :
Don't care
Z :
High impedance
48
2OE
47 1A1
46
1A2
45 GND
44
1A3
43 2A1
42
VCC
41 2A1
40
2A2
39 GND
TOP VIEW
38
2A3
37 2A4
36
3A1
35 3A2
34
GND
33 3A3
32
3A4
31 VCC
30
4A1
29 4A2
28
GND
27 4A3
26
4A4
25 3OE
Outputs
1Y1-1Y4
L
H
Z
Outputs
2Y1-2Y4
L
H
Z
Outputs
3Y1-3Y4
L
H
Z
Outputs
4Y1-4Y4
L
H
Z
IEC LOGIC SYMBOL
1
1OE EN1
48
2OE EN2
25
EN3
3OE
24
4OE EN4
47
1A1
46
1A2
44
1A3
43
1A4
41
2A1
40
2A2
38
2A3
37
2A4
36
3A1
35
3A2
33
3A3
32
3A4
30
4A1
29
4A2
27
4A3
26
4A4

SYSTEM DIAGRAM

1OE
2OE
1A1-1A1 1Y1-1Y4
2A1-2A4 2Y1-2Y4
TX-SR606
2
1 1
1Y1
3
1Y2
5
1Y3
6
1Y4
8
1 2 2Y1
9
2Y2
11
2Y3
12
2Y4
13
1 3 3Y1
14
3Y2
16
3Y3
17
3Y4
19
1 4 4Y1
20
4Y2
22
4Y3
23
4Y4
3OE
4OE
3Y1-3Y4 3A1-3A4
4Y1-4Y4 4A1-4A4
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