+ 5V供电，多通道RS - 232
驱动器/接收器
MAX220–MAX249
顶视图
+ 5V输入
1.0F
9
10
1.0F
12
13
1.0F
14
C1+
C1-
C2+
C2-
+5V
T3
OUT
1
T1
OUT
2
T2
OUT
3
R1
IN
4
R1
OUT
5
T2
IN
6
T1
IN
7
GND 8
V
CC
9
C1+ 10
V+ 11
C1- 12
24 T4
OUT
23 R2
IN
22 R2
OUT
21 T5
IN
6 T2
IN
+5V
TTL / CMOS
输入
18 T3
IN
+5V
19 T4
IN
+5V
400k
21 T5
IN
T5
T5
OUT
20
400k
T4
T4
OUT
24
400k
T3
T3
OUT
1
RS-232
输出
7 T1
IN
+5V
400k
T2
T2
OUT
3
V
CC
+ 5V至+ 10V
倍压
+ 10V至-10V
高压变频器
V+
11
1.0F
V-
15
1.0F
400k
T1
T1
OUT
2
MAX237
20 T5
OUT
19 T4
IN
18 T3
IN
17 R3
OUT
16 R3
IN
15 V-
14 C2-
13 C2+
DIP / SO
5 R1
OUT
R1
5k
R1
IN
4
TTL / CMOS
输出
22 R2
OUT
R2
5k
R2
IN
23
RS-232
输入
17 R3
OUT
R3
5k
GND
8
R3
IN
16
图15. MAX237引脚配置和典型工作电路
24
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