Yamaha Tyros3 Service Manual page 44

Tyros3
IC BLOCK DIAGRAM
SN74AHC14PWR (X3098A00)
SN74LV14APWR (X6688A0R)
TC74VHC14FT (XV890B0R)
DM: IC4, 5, 7, 510
Hex Inverter
1
1A
2
1Y
3
2A
4
2Y
5
3A
6
3Y
7
GND
SN74ACT74PWR (X9486A00)
TC74ACT74FT (X6536A0R)
DM: IC404
Dual D-Type Flip-Flop
1CLR 1
2
1D D
D
3
1CK CK
4
1PR PR
CK
5 Q
1Q
PR
6
Q
1Q Q
7
GND
Q
INPUTS
PR CLR CLK D
L H X X
H L X X
L L X X
H H f H
H H f L
H H L X
SN74LV273APWR (X5074A00)
TC74VHC273FT (X7942B00)
DM: IC23
Octal D-Type Flip-Flop
1
CLEAR
2
1Q
Q
CL CL
3
D CK CK
1D
4
2D
D CK CK
CL CL
5
Q
2Q
6
3Q
Q
CL CL
7
D CK CK
3D
8
4D
D CK CK
CL CL
9
Q
4Q
10
GND
44
SN74LV21APWR (X2377A0R)
TC74VHC21FT (X5542A00)
DM: IC20
Dual 4 Input AND
14
VDD
13
6A
12
6Y
11
5A
10
5Y
9
4A
GND
8 4Y
SN74LVC138APWR (X7074A00)
DM: IC502
3 to 8 Demultiplexer
14
VCC
13
2CLR
Select
12
2D
11
2CK
G2A
10
2PR
Enable
G2B
9
2Q
8
2Q
Output
GND
OUTPUTS
Q Q
H L
L H
H H
SN74AHCT245PWR (X2709A0R)
H L
TC74VHCT245AFT (XT744B0R)
L H
Q Q
O O
DM: IC200
SN74LV245APWR (X3693A0R)
TC74VHC245FT (XU797B00)
DM: IC201
SN74LVC245APWR (XZ287A0R)
DM: IC16 ― 19, 21, 22, 808 ― 811
Octal 3-State Bus Transceiver
20
VCC
D1R
19
8Q
Q
18
D
8D
17
7D
D
16
Q 7Q
15
6Q
Q
14
D 6D
13
5D
D
12
Q 5Q
11
CLOCK
GND
1A Vcc
1 14
1B 2D
2 13
NC 2C
3 12
1C NC
4 11
1D 2B
5 10
1Y 2A
6 9
2Y
7 8
1
A 16 Vcc
A
2 B
B Y0 15 YO
3
C Y1 14
C Y1
4
G2A 13 Y2
Y2
Output
5
G2B Y3 12
Y3
6
G1 Y4 11
G1 Y4
7 10
Y7 Y7 Y5 Y5
Y6
8
9 Y6
1 20 V
CC
A1 2 19 G
A2 3 18 B1
A3 4 17 B2
A4 5 16 B3
A5 6 15 B4
A6 7 14 B5
A7 8 13 B6
A8 9 12 B7
10 11 B8
SN74LV32APWR (X5647A00)
DM: IC6
SN74LVC32APWR (X5405A00)
DM: IC212
Quad 2 Input OR
1A Vcc
1 14
1B 4B
2 13
1Y 4A
3 12
2A 4Y
4 11
2B 3B
5 10
2Y 3A
6 9
GND 3Y
7 8
HD74LVC139TELL (X4963A0R)
SN74LVC139APWR (X7227A00)
DM: IC24, 25
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
7 Y2
1Y3 10 2Y2
Y3
Y3
8
GND 9 2Y3
SN74LVC1G32DCKR (X5825A00)
DM: IC213
2-Input OR Gate
IN B Vcc
1 5
IN A
2
3 4
OUT Y
GND
FUNCTION TABLE
INPUTS OUTPUT
A B Y
H X H
X H H
L L L