1
1
2
2
3
3
4
4
D D
C C
B B
A A
Title
Number RevisionSize
A4
Date: 2014.10.3 Sheet of
File: E:\51 \..\Sheet1.SchDoc Drawn By:
74HC245
A0
2
A1
3
A2
4
A3
5
A4
6
A5
7
A6
8
A7
9
B7
11
B6
12
B5
13
B4
14
B3
15
B2
16
B1
17
B0
18
VCC
1
VCC
20
GND
19
GND
10
Y1
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
4
8*8
DR1
DR2
DR3
DZ9
1
2
4
3
6
1
2
4
3
7
1
2
4
3
8
1
2
4
3
9
1
2
4
3
10
1
2
4
3
11
VCC
GND
RST
1 2
JZ1
GND
XL1
XL2
XL1
XL2
key1
key2
key3
key4
key5
+
1
-
2
pow1
pow
VCC
GND
DZ1DZ2
DZ3DZ4DZ5DZ6DZ7DZ8
key1
key2
key3
key4
key5
RST
GND
VCC
GND
GND
VCC
VCC
1
2
3
4
5
6
7
8
0
PZ1
EJG1 EJG2 EJG3 EJG4 EJG5
DZ11
GND
key6
key6
VCC
key1
key2
key3
key4
key5
STC89C52
P10
1
P11
2
P12
3
P13
4
P14
5
P15
6
P16
7
P17
8
RST
9
P30
10
P31
11
P32
12
P33
13
P34
14
P35
15
P36
16
P37
17
X2
18
X1
19
GND
20
P20
21
P21
22
P22
23
P23
24
P24
25
P25
26
P26
27
P27
28
PSEN
29
ALE/PROG
30
EA
31
P07
32
P06
33
P05
34
P04
35
P03
36
P02
37
P01
38
P00
39
VCC
40
DPJ1
STC89C52RC
