Yamaha CS1D Service Manual page 45

CS1D
HD74LV125AFPEL (IS012500)
Quad 3-State Bus Buffer
C1 1
14
A1 2
13
Y1 3
12
C2
4 11
A2
5 10
Y2
6 9
GND 7
8
SN74LV164ANSR (IS016410)
8-Bit Shift Register
A
1 14
SIRIAL
A
INPUT
B
2 B QH 13
QA
3 QA QG 12
QB
4 QB QF 11
OUTPUTS
QC
5 QC QE 10
QD
6 QD CLEAR 9
CK
A
GND
7 8
TC74HC251AF (XQ968A00)
3-State 8 to 1 Data Selector
3 1 16
2 2 D2 D3 D4
15
DATE
INPUTS
1
3 14
D1 D5
0 4 D0 D6
13
Y 5 D7
Y 12
OUTPUTS
W
6 A 11
W
S B
STROBE 7 C
10
GND 8
9
40
SN74LV138ANSR (IS013810)
3 to 8 Demultiplexer
A
Vcc
Select
B
C4
C
A4
G2A
Y4
Enable
G2B
C3
G1
A3
Output
Y7
Y3
GND
HD74LV244AFPEL (IS024400)
Octal 3-State Bus Buffer
VCC
1G
QH
1A1
QG
2Y4
OUTPUTS
QF
1A2
QE
2Y3
CLEAR
1A3
CLOCK
2Y2
1A4
2Y1
(GND) Vss
HD74LV273AFPEL (IS027300)
Octal D-Type Flir Flop
Vcc
1
CLEAR
4
2
1Q
5
3
DATA 1D
INPUTS
6
4
2D
7
5
2Q
6
A
3Q
DATA
7
B
3D
SELECT
8
C 4D
9
4Q
10
GND
1
16 Vcc
A
2 B 15
Y0 YO
3
C Y1 14
Y1
4
G2A Y2 13 Y2
Output
5
G2B Y3 12
Y3
6
G1 Y4 11
Y4
7 10
Y7 Y5 Y5
Y6
8
9 Y6
VDD (Vcc)
1 20
2G
2 19
1Y1
3 18
2A4
4 17
1Y2
5 16
2A3
6 15
1Y3
7 14
2A2
8 13
1Y4
9 12
2A1
10 11
20
VCC
19
8Q
Q Q
CL CL
D CK CK D 18
8D
17
7D
D CK CK D
CL CL
Q Q 16
7Q
15
6Q
Q Q
CL CL
14
D CK CK D 6D
13
5D
D CK CK D
CL CL
12
Q Q 5Q
11
CLOCK
SN74LV139ANSR (IS013910)
Dual 2 to 4 Demultiplexer
1
1G 16 Vcc
G
2 G 15
1A 2G
A
A
3
14
1B 2A
B
4 B
1Y0 13 2B
Y0
5 Y0
12
1Y1 2Y0
Y1
6 Y1
11
1Y2 2Y1
Y2
Y2
7 10
1Y3 2Y2
Y3
Y3
8
GND 9 2Y3
HD74LV245AFPEL (IS024500)
TC74VHCT245AF (XV242A00)
TC74VHC245F (XT487A00)
Octal 3-State Bus Transceiver
1
D1R
20 Vcc
2
19
A1
G
18
3
A2
B1
17
4
A3
B2
16
5
A4 B3
15
6
A5 B4
14
A6 7 B5
13
A7
8 B6
12
A8
9 B7
GND 11 B8
10
SN75121NSR (XU816A00)
Dual Line Driver
1A 1 16 Vcc
1B 2 15 2F
1C 3 14 2E
1D 13
4 2D
1E 5 12 2C
1F 6 11 2B
1Y 7 10 2A
GND 9 2Y
8