+ 5V供电，多通道RS - 232
驱动器/接收器
MAX220–MAX249
+5V
顶视图
1F
40
V
CC
ENR
T
A1
IN
T
A2
IN
T
A3
IN
T
A4
IN
R
A5
OUT
R
A4
OUT
R
A3
OUT
R
A2
OUT
R
A1
OUT
R
A1
IN
R
A2
IN
R
A3
IN
R
A4
IN
R
A5
IN
T
A1
OUT
T
A2
OUT
T
A3
OUT
T
A4
OUT
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
40
39
38
37
36
35
V
CC
耳鼻喉科
T
B1
IN
T
B2
IN
T
B3
IN
T
B4
IN
R
B5
OUT
R
B4
OUT
R
B3
OUT
R
B2
OUT
R
B1
OUT
R
B1
IN
R
B2
IN
R
B3
IN
R
B4
IN
R
B5
IN
T
B1
OUT
T
B2
OUT
T
B3
OUT
T
B4
OUT
9 R
A2
OUT
R
B2
OUT 31
R
B3
27
5k
R
B3
OUT 32
R
B4
26
5k
R
B4
OUT 33
R
B5
在25
5k
R
B5
出34
GND
20
13 R
A3
IN
5k
10 R
A1
OUT
12 R
A2
IN
5k
R
B1
OUT 30
R
B2
28
5k
11 R
A1
IN
5k
R
B1
29
5k
18 T
A3
OUT
4 T
A3
IN
19 T
A4
OUT
5 T
A4
IN
1 ENR
+5V
400k
T
B4
35
耳鼻喉科39
+5V
+5V
400k
T
B3
36
T
B4
OUT 21
+5V
T
B3
OUT 22
17 T
A2
OUT
3 T
A2
IN
+5V
400k
T
B2
37
+5V
T
B2
OUT 23
16 T
A1
OUT
2 T
A1
IN
+5V
400k
T
B1
38
+5V
T
B1
出24
MAX245
34
33
32
31
30
29
28
27
26
25
24
23
22
21
DIP
MAX245功能说明
10个接收器
5人制容器（ RA5始终处于激活状态）
5 B - SIDE容器（ RB5始终处于激活状态）
8 TRANSMITTTERS
4人制变送器
2个控制脚
1接收使能（ ENR ）
1发送使能（ ENT ）
8 R
A3
OUT
14 R
A4
IN
5k
7 R
A4
OUT
15 R
A5
IN
5k
6 R
A5
OUT
图21. MAX245引脚配置和典型工作电路
30
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