NHB32-C
17
IC BLOCK DIAGRAM
1
D1R
2
3
4
5
6
7
8
9
10
A1
A2
A3
A4
A5
A6
A7
A8
GND
11
12
13
14
15
16
17
18
19
20
V
CC
G
B1
B2
B3
B4
B5
B6
B7
B8
TC74HC245F(XT487A00)
TC74VHC245AFT(XT744A00)
BUFFER
TC74VHC245FT(XU797A00)
AES: IC203-214, IC220, IC310, IC501, IC601-606,
MAIN: IC219, IC309, IC310, IC503, IC604-608
TC74VHC125FT (XY074A00)
BUFFER
TC74VHC244FT (XW234A00)
MAIN: IC308, IC402, IC408, IC409
BUS BUFFER
TC74VHC245MTCX (X0296A00)
AES: IC203-214, IC220, IC310, IC501, IC601-608,
MAIN: IC219, IC309, IC310, IC503, IC604-608
1
2
3
4
5
6
7
C1
A1
Y1
C2
A2
Y2
GND
14
13
12
11
10
9
8
Vcc
C4
A4
Y4
C3
A3
Y3
AM26LS31CNSR
AES: IC302, IC402, IC702, IC802
TRANSMITTER
(XU996A00) DS26C32ATMX (XU815A00)
AES: IC301, IC401, IC701, IC801
RECEIVER
MAIN: IC207, IC214, IC215, IC218
HD74LV574AFPEL (IS057400)
D-FF
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
X= irrelevant
Z= high impedance (off)
OUTPUTS
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
1
2
3
4
5
6
7
INPUT A
INPUT A
OUTPUT A
OUTPUT C
INPUT C
INPUT C
GND
ENABLE
16
15
14
13
12
11
Vcc
INPUT B
INPUT B
OUTPUT B
ENABLE
OUTPUT D
INPUT D
8
9
10
INPUT D
+
-
-
+
+
-
-
+
10
9
8
7
6
5
4
3
2
1
D5
D
CK
Q
OE
D
CK
Q
OE
D
CK
Q
OE
D
CK
Q
OE
D
CK
Q
OE
D
CK
Q
OE
D
CK
Q
OE
D
CK
Q
OE
D6
D7
GND
D4
D3
D2
D1
D0
Output
Control
Q5
Q6
Q7
Clock
Q4
Q3
Q2
Q1
Q0
Vcc
11
12
13
14
15
16
17
18
19
20
1
2
3
4
5
6
7
19
18
17
16
15
14
20
1G
1A1
2Y4
1A2
2Y3
1A3
2Y2
V
DD
(Vcc)
2G
1Y1
2A4
1Y2
2A3
1Y3
8
9
10
13
12
11
1A4
2Y1
(GND) Vss
2A2
1Y4
2A1
6
7
8
9
10
3Q
3D
4D
4Q
GND
11
12
13
14
15
V
CC
8Q
8D
7D
7Q
6Q
6D
5D
5Q
CLOCK
Q
Q
D
D
CK
CK
CL
CL
Q
Q
D
D
CK
CK
CL
CL
SN75C1168NSR (XU073A00)
DRIVER/RECEIVER
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
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8
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9
9
2
8
9
4
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9
8
0
5
1
5
1
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6
7
3
Q
Q
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