19
AFC1
MM74HC175SJX (XY307A00)
MAIN: IC024, 046-049
Quad D-Type Flip-Flop
TC74VHC245F (XT487A00)
MAIN:
MM74HC245ASJX (XW107A00)
MAIN:
SN74ABT245BNSR (XU009A00)
MAIN:
Octal 3-State Bus Transceiver
MM74HC273SJX (XY198A00)
MAIN: IC023
Octal D-Type Flir Flop
TC74HC4052AF (XS790A00)
MAIN: IC044, 045
Differential 4-Channel
Multiplexer/Demultiplexer
TC74LVX4245FS (XU229A00)
MAIN: IC111-117
Dual Supply Octal Bus Transceiver
SN75121NSR (XU816A00)
MAIN: IC036, 043
Dual Line Driver
SN75124NSR (XV930A00)
MAIN: IC039
Triple Line Receiver
SN75C1168NSR (XU073A00)
MAIN: IC021, 037, 122
Line Driver / Receiver
AM26LS31CNSR (XU996A00)
MAIN: IC034, 035, 118, 119
Quad Line Driver
Q CL
Q
D
CK
Q CL
Q
D
CK
Q
CL
Q
D
CK
Q
CL
Q
D
CK
1
2
3
4
5
6
7
CL
1Q
1Q
1D
2D
2Q
2Q
16
15
14
13
12
11
10
VDD
4Q
4Q
4D
3D
3Q
3Q
8
Vss
9
CK
1
2
3
4
5
6
7
20
19
18
17
16
15
14
Vcc
G
B1
B2
B3
B4
B5
B6
B7
B8
8
9
10
12
11
GND
A8
A7
A6
A5
A4
A3
A2
A1
D1R
13
CLEAR
1Q
1D
2D
2Q
3Q
3D
4D
4Q
GND
VCC
8Q
8D
7D
7Q
6Q
6D
5D
5Q
CLOCK
1
20
2
19
3
18
4
17
5
16
6
15
7
14
8
13
9
12
10
11
Q
D CK
CL
D
Q
CK
CL
Q
D CK
CL
D
Q
CK
CL
D
Q
CK
CL
Q
D
CK
CL
D
Q
CK
CL
Q
D
CK
CL
1
2
3
4
5
6
7
0Y
2Y
Y-COM
1Y
INH
VEE
VSS
3Y
16
15
14
13
12
11
VDD
2X
1X
X-COM
0X
3X
A
8
9
10
B
2Y
0Y
Y-COM
3Y
1Y
INH
B
2X
1X
X-COM
0X
3X
A
VCCA
DIR
A1
A2
A3
A4
A5
A6
A7
A8
GND
GND
VCCB
VCCB
/G
B1
B2
B3
B4
B5
B6
B7
B8
GND
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
8
9
10
12
13
14
15
G1
G2
D
D
B
A
11
24
23
22
21
20
19
18
8
9
10
11
12
16
15
14
13
17
1A
1B
2R
2S
2A
2B
2Y
GND
1
16
2
15
3
14
4
13
5
12
6
11
7
10
8
9
Vcc
1S
1R
1Y
3A
3S
3R
3Y
1
2
3
4
5
6
7
1B
1A
1R
1DE
2R
2A
2B
16
15
14
13
12
11
10
Vcc
1D
1Y
1Z
2DE
2Z
2Y
8
GND
9
2D
1
2
3
4
5
6
7
1A
1Y
1Z
2Z
2Y
2A
GND
ENABLE G
16
15
14
13
12
11
Vcc
4A
4Y
4Z
ENABLE G
3Z
3Y
8
9
10
3A
OUTPUTS
H= high level
L= low level
X= irrelevant
Z= high impedance (off)
ENABLES
INPUT
A
G
G
Y
Z
H
H
X
X
L
X
X
L
L
H
H
L
H
L
Z
L
H
L
H
Z
H
L
H
L
X
IC029, 066, 067, 074, 075
IC030, 031, 052-061, 068-073
IC050, 051
Vcc
2F
2E
2A
2Y
GND
1Y
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
2C
2B
2D
1A
1B
1C
1D
1E
1F