+ 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
400k
T2
OUT
1
T1
OUT
2
R2
IN
3
R2
OUT
4
T1
IN
5
R1
OUT
6
R1
IN
7
GND 8
V
CC
9
C1+ 10
V+ 11
C1- 12
24 T3
OUT
23 R3
IN
22 R3
OUT
21 T4
IN
18 T2
IN
TTL / CMOS
输入
19 T3
IN
+5V
400k
21 T4
IN
T4
T4
OUT
20
+5V
400k
T3
T3
OUT
24
T2
5 T1
IN
+5V
400k
T2
OUT
1
RS-232
输出
T1
T1
OUT
2
+ 10V至-10V
高压变频器
V-
V
CC
+ 5V至+ 10V
倍压
V+
11
1.0F
15
1.0F
MAX238
20 T4
OUT
19 T3
IN
18 T2
IN
17 R4
OUT
16 R4
IN
15 V-
14 C2-
13 C2+
6 R1
OUT
R1
R1
IN
7
5k
DIP / SO
4 R2
OUT
TTL / CMOS
输出
22 R3
OUT
R3
R2
R2
IN
5k
R3
IN
5k
3
RS-232
输入
23
17 R4
OUT
R4
R4
IN
5k
16
GND
8
图16. MAX238引脚配置和典型工作电路
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