Yamaha DME 32 Service Manual page 20

DME32
MM74HC175SJX (XY307A00)
Quad D-Type Flip-Flop
MAIN: IC24, 46-49
1
CL 16
2 15
1Q
Q CL CL Q
CK CK
Q D D Q
3
14
1Q
4
1D 13
5
12
2D
6
11
2Q Q D D Q
CK CK
Q CL CL Q
7 10
2Q
8
Vss 9
TC74HC4052AF (XS790A00)
Differential 4-Channel
Multiplexer/Demultiplexer
MAIN: IC44, 45
1
0Y 16
2Y 2
2Y 2X 15
Y-COM 3
Y-COM 1X 14
3Y
4 3Y X-COM 13
1Y
5 1Y 0X 12
INH 6
INH 3X 11
VEE
7 A
10
VSS
8 9
SN75124NS (XV930A00)
Triple Line Receiver
MAIN: IC39
1A
1 16
1B
2 15
2R
3 14
2S
4 13
2A
5 12
2B
6 11
2Y
7 10
GND
8 9
20
MM74HC245ASJX (XW107A00)
SN74ABT245BNSR (XU009A00)
TC74VHC245F (XT487A00)
Octal 3-State Bus Transceiver
MAIN: IC29-31, 50-52, 60, 61, 66-75
D1R
VDD
A1
4Q
A2
4Q
A3
4D
A4
3D
A5
3Q
A6
3Q
A7
CK
A8
GND
TC74LVX4245FS (XU229A00)
Dual Supply Octal Bus Transceiver
MAIN: IC111-117
VCCA
DIR
VDD
A1
2X
A2
1X
A3
X-COM
A4
0X
A5
3X
A6
A
A7
B
A8
GND
GND
SN75C1168NSR (XU073A00)
Line Driver / Receiver
MAIN: IC21, 37, 122
Vcc
1B
1S
1A
1R
1R
1Y 1DE
3A
2R
3S 2A
3R 2B
3Y GND
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
1 24 VCCB
0
2 VCCB
1 A 23
/G
3 22
2 B
B1
4
3 D 21
5
4 D 20 B2
6 19
5 G2
B3
7
18
6 G1 B4
8 7 15 B5
17
9 16
8 14
B6
10 9 13 15
B7
11 14
10 12 B8
11
12 13
GND
1 16 Vcc
2
15
1D
3 14
1Y
4
13 1Z
5
12
2DE
6 11
2Z
7
10 2Y
8
9 2D
MM74HC273SJX (XY198A00)
Octal D-Type Flir Flop
MAIN: IC23
1
CLEAR
2
1Q
Q Q
CL CL
3
D CK CK D
1D
4
2D
D CK CK D
CL CL
5
Q Q
2Q
6
3Q
Q Q
CL CL
7
D CK CK D
3D
8
4D
D CK CK D
CL CL
9 Q Q
4Q
10
GND
SN75121NSR (XU816A00)
Dual Line Driver
MAIN: IC36, 43
1 16
1A
1B 2
15
1C 3 14
1D 4 13
1E 5 12
1F 6 11
1Y 7 10
GND 8 9
AM26LS31CNSR (XU996A00)
Quad Line Driver
MAIN: IC34, 35, 118, 119
1
1A 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 OUTPUTS
A
G G Y Z
H H X H L
H= high level
L H X L H
L= low level
H X L H L
X= irrelevant
L X L L H
Z= high impedance (off)
X L H Z Z
20
VCC
19
8Q
18
8D
17
7D
16
7Q
15
6Q
14
6D
13
5D
12 5Q
11 CLOCK
Vcc
2F
2E
2D
2C
2B
2A
2Y
Vcc
4A
4Y
4Z
ENABLE G
3Z
3Y
3A