Ic Block Diagram - Yamaha AO8 Service Manual

AO8

IC BLOCK DIAGRAM

HD74LVU04AFPEL (XY102A00)
Hex Inverter
IFC3: IC105
1
1A 14
2
13
1Y
3
12
2A
4 11
2Y
5 10
3A
6 9
3Y
7
Vss 8
SN74LV138ANSR (IS013810)
3 to 8 Demultiplexer
UNC: IC211, 212
1
A 16
A
Select
2
B Y0 15
B
3
14
C C Y1
4 13
G2A G2A Y2
Enable
5 G2B 12
G2B Y3
6
11
G1 Y4
G1
Output
7
Y7 Y7 Y5 10
Y6
GND 8 9
AM26LS31CNSR (XU996A00)
Quad Line Driver
IPC2: IC107
1A 1
16
1Y 2
15
1Z 3 14
ENABLE G 4
13
2Z 5
12
2Y 6
11
2A 7
10
GND 8
9
INPUT ENABLES
A G G
H H X
L H X
H X L
L X L
X L H
H= high level X= irrelevant
L= low level Z= high impedance (off)
14
HD74LV04AFPEL (IS000400)
Hex Inverter
IFC3: IC311, 408
UNC: IC105
1A
VDD
6A 1Y
2A
6Y
5A 2Y
3A
5Y
3Y
4A
Vss
4Y
TC74VHC245F (XT487A00)
Octal 3-State Bus Transceiver
IPC2: IC104, 105
IFC3: IC101-103, 106, 107, 404-407,
601-608
UNC: IC102, 204, 210
Vcc
YO
D1R
Y1 A1
Y2 A2
Output
Y3
A3
Y4 A4
Y5
A5
Y6
A6
A7
A8
GND
SN75124N (XE737A00)
Triple Line Receiver
IPC4: IC300
Vcc
4A
1A
4Y
1B
4Z
2R
ENABLE G
2S
3Z
2A
3Y
2B
3A
2Y
OUTPUTS
Y Z
GND
H L
L H
H L
L H
Z Z
1
14
VDD
2
13
6A
3
12
6Y
4 11
5A
5 10
5Y
6 9
4A
7
8
4Y
1
20 Vcc
2
19
G
18
3
B1
17
4
B2
16
5
B3
15
6 B4
14
7 B5
13
8 B6
12
9 B7
11 B8
10
Vcc
1 16
1S
2 15
1R
3 14
1Y
4 13
3A
5 12
3S
6 11
3R
7 10
8 9 3Y
HD74LV08AFPEL (IS000800)
Quad 2 Input AND
IFC3: IC104, 310, 409
UNC: IC104, 213
1A VDD
1 14
1B 4B
2 13
1Y 4A
3 12
2A 4Y
4 11
2B 3B
5 10
2Y 3A
6 9
VSS 3Y
7 8
DS26C32ATMX (XU815A00)
Quad Differential Line Receiver
IPC2: IC100-103, 106
1
INPUT A 16 Vcc
-
+
INPUT A 2
15
INPUT B
OUTPUT A 3
14 INPUT B
ENABLE
4 13
OUTPUT B
OUTPUT C
5 12
ENABLE
INPUT C
6 11
OUTPUT D
+
-
INPUT C
7
10 INPUT D
GND INPUT D
8 9
SN75121 (XE638A00)
Dual Line Driver
IPC4: IC301
1A 1 16 Vcc
1B 2 15 2F
1C 3 14 2E
1D
4 13 2D
1E 5 12 2C
1F 6 11 2B
1Y 2A
7 10
GND 2Y
8 9