Pioneer VSX-AX4AVi-S Service Manual page 242

1
TC7W139FU (DSP ASSY : IC104)
• 2-to-4 Line Decoder
A
Pin Arrangement (Top view)
A 1
B 2
Y3 3
B
GND 4
CY7C1049CV33-12VXC (DSP ASSY : IC106)
C
• 512k X 8 Static RAM
Pin Arrangement (Top view)
A0 1
A1 2
A2 3
A3 4
A4 5
CE 6
D
I/O0 7
I/O1 8
VCC 9
GND 10
I/O2 11
I/O3 12
WE 13
A5 14
A6 15
A7 16
E
A8 17
A9 18
F
242
1
2
8 Vcc
7
Y0
6
Y1
5
Y2
36
NC
35 A18
34 A17
33 A16
32
A15
31
OE
30 I/O7
29 I/O6
28
GND
27
VCC
26
I/O5
25 I/O4
24 A14
23
A13
22
A12
21
A11
20 A10
19 NC
VSX-AX4AVi-S
2
3
Truth Table
Inputs Outputs
Select
Y0 Y1
B A
L L L H
L H H L
H L H H
H H H H
Block Diagram
A0 1
2
A1
Input Buffer
A2 3
4
A3
A4 5
14 512 x 8
A5
Array
A6 15
16
A7
A8 17
18
A9
20
A10
CE 6
Column Decoder
13
WE
OE 31
21 22 23 24 32 33 34 35
3
4
Selected
Output
Y2 Y3
H H Y0
H H Y1
L H Y2
H L Y3
I/O0
7
I/O1
8
I/O2
11
I/O3
12
I/O4
25
I/O5
26
I/O6
29
I/O7
30
Power
Down
4