Yamaha DM1000 Service Manual page 59

HD74HC123AP (IR012310)
DCA: IC350
Dual Retriggerable Single Shot
1A Vcc
1 16
1B 1 Rext / Cext
2 15
1 Cext
3 CLR 14
1Q 1Q
4 Q 13
Q
2Q 2Q
5 12
Q Q
CLR
2 Cext CLR
6 11
2 Rext / Cext 2B
7 10
GND
8 9 2A
TC74HC238AF (XT163A00)
PN1: IC101
3 to 8 Line Decoder
Select
Inputs
G2A
Enable
G2B
Inputs
G1
Y7
GND
SN74HC244NSR (XD233A00)
FD: IC202
TC74VHC244F (XT800A00)
JK1: IC401
Octal 3-State Bus Buffer
1G VDD (Vcc)
1 20
2G
2 19
1A1
1Y1
3 18
2Y4
1A2 2A4
4 17
1Y2
5 16
2Y3
2A3
1A3
6 15
1Y3
2Y2 7 14
2A2
8 13
1A4
1Y4
9 12
2Y1
(GND) Vss 2A1
10 11
TC74VHC138F (XT015A00)
FD: IC301, 401, 501
3 to 8 Demultiplexer
A 1
Select
2
B
3
C
4
G2A
Enable
5
G2B
6
G1
Output
7
Y7
8
GND
A 1
B 2
3
C
4
5
6
7
8
TC74VHC273F (EL) (XY254A00)
FD: IC402, 403, 406, 407, 503-505
JK1: IC301
Octal D-Type Flip-Flop
1
CLEAR
2
1Q Q
3
D CK
1D
4
2D
D
5 Q
2Q
6
3Q
Q
7 D CK
3D
8
4D
D
9 Q
4Q
10
GND
16 Vcc
A
B Y0 15
YO
14
C Y1 Y1
G2A Y2 13 Y2
Output
G2B Y3 12 Y3
11
G1 Y4
Y4
Y7 Y5 10 Y5
Y6
9
Y6
20
VCC
19
8Q
Q
CL CL
18
CK D
8D
17
7D
CK CK D
CL CL
Q 16
7Q
15
6Q
Q
CL CL
CK D 14
6D
13
5D
CK CK D
CL CL
Q 12
5Q
11 CLOCK
DM1000/MB1000/SP1000
TC74VHC157F (EL) (XT475A00)
MAIN: IC503-506
Quad 2 to 1 Multiplexer
SELECT 1 16 Vcc
2
1A G 15
1A STROBE
3 1B 4A 14
1B 4A
4
1Y 1Y 4B 13 4B
5 2A 4Y
2A 12 4Y
6 2B 3A 11
2B 3A
7
2Y 2Y 3B 10 3B
8 9
GND 3Y
16 Vcc
15 Y0
14 Y1
13
Y2
Data
12 A 1
Y3
Output
B 2
11 Y4
C
3
10 Y5
G2A 4
9 Y6
G2B 5
G1
6
Y7 7
GND 8
74VHC541SJX (XY961A00)
MAIN: IC117, 213, 607, 804, 805, 902, 903
Octal 3-State Buffer
G1 1
20 Vcc
A1
2 G2
19
A2
3 Y1
18
A3
4 17 Y2
A4 Y3
5 16
A5 6 Y4
15
A6 Y5
7
14
A7
8 Y6
13
A8
9 Y7
12
GND Y8
10 11
16 Ycc
15
Y0
14 Y1
13 Y2
12
Y3
11
Y4
10 Y5
Y6
9
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