Yamaha i88x Service Manual page 25

TC74VHC74FT (XV892A00)
Dual D-Type Flip-Flop
DM:IC609
1 14
1CLR
VCC
2
13
D
1D
2CLR
D
3
12
CK
1CK
2D
4
11
PR
1PR CK 2CK
5
Q 10
1Q
PR 2PR
6
9
Q Q
1Q 2Q
7 8
GND Q 2Q
INPUTS OUTPUTS
PR CLR CLK D Q
L H X X H
H L X X L
L L X X H
H H f H H
H H f L L
H H L X Q
O
TC74VHC157FT (X0199A00)
Quad 2 to 1 Multiplexer
DM:IC602
1
SELECT 16 Vcc
2
1A G 15
1A STROBE
3
1B 4A 14
1B 4A
4
1Y 1Y 4B 13 4B
5
2A 4Y 12
2A 4Y
6 2B 3A
11
2B 3A
7
2Y 2Y 3B 10 3B
8 9
GND 3Y
SN74HC574NSR (XH225A00)
Octal D-Type Flip-Flop
DM:IC512
OUT PUT 1 V
20
CONTROL
OE
1D 2 19 1Q
D Q
OE
2D 3 18 2Q
D Q
OE
3D 4 D Q 17 3Q
OE
4D 5 16 4Q
D Q
OE
5D 6 15 5Q
D Q
OE
6D 7 6Q
D Q 14
OE
7D 8 13 7Q
D Q
OE
8D 9 12 8Q
D Q
GND 10 11 CLOCK
TC7WH74FU (XS680A00)
D-Type Flip-Flop
CK 1
D
2
Q 3
4
GND
Q
L
H
H
L
H
Q
O
HD74LVC244ATELL (X2308A00)
Octal 3-state Bus Buffer
1OE 1
2
1A1
3
2Y4
1A2 4
5
2Y3
6
1A3
7
2Y2
8
1A4
9
2Y1
(GND) 10
DS26C32ATMX (XU815A00)
Line Receiver
CC
1
INPUTS A
2
OUTPUT A 3
ENABLE 4
OUTPUT C 5
6
+
INPUTS C
7
GND 8
DM:IC501
8 V
CC
PR
D Q
7
PR
CK
CLR
6
Q
CLR
5
Q
MLN2:IC36,IC40
20 VDD
19 2OE
18 1Y1
17 2A4
16 1Y2
15 2A3
14 1Y3
13 2A2
12 1Y4
11 2A1
DM:IC601
DM:IC1,IC2,IC3,IC4,IC5,IC6,IC7,IC8,IC9,IC10,
IC11,IC21,IC22,IC23,IC24,IC25,IC26,IC27,IC28,
16 Vcc
IC29,IC30,IC31,IC32,IC33,IC34,IC35,IC38
-
+
15
-
INPUTS B
+
14
13 OUTPUT B
12 ENABLE
11 OUTPUT D
-
10
+
INPUTS D
-
9
SN74HC151NSR (XV734A00)
8 to 1 Data Selector
DM:IC511
1
16 Vcc
3
D3
2 2 15
D2 D4 4
Data
Inputs
1 3
D1 14 5
D5
0 4
D0 13 6
D6
5
Y Y D7 12 7
Outputs
6 W A 11 A
W
Strobe 7 S
10
B B
C
GND 8 9
C
SN74LV245APWR (X3693A00)
HD74LVC245ATELL (XW148A00)
SN74LVC245APWR (XZ287A00)
Octal Bidirectional Transceiver
DM:IC504,IC506,IC509,IC510
MLN2:IC22,IC26,IC35,IC37,IC39
D1R
1 20
A1
2 19
A2
3 18
A3
4 17
A4
16
5
A5
6 15
A6
7 14
A7
8 13
A8
9 12
GND 11
10
NJM4556AD (XQ824A00)
NJM4580M-D(TE2) (X5025A00)
µPC4570G2 (XF291A00)
Dual Operational Amplifier
+DC Voltage
Output A 1 +V 8
Supply
Inverting
2 7 Output B
Input A
- +
Inverting
Non-Inverting
3 6
+ -
Input A Input B
Non-Inverting
-DC Voltage Supply 4 -V 5
Input B
i88X
Data
Inputs
Data
Select
VCC
G
B1
B2
B3
B4
B5
B6
B7
B8
25