+ 5V供电，多通道RS - 232
驱动器/接收器
MAX220–MAX249
+ 5V输入
顶视图
1.0F
12
+5V
400k
8 T1
IN
+5V
400k
7 T2
IN
+5V
400k
TTL / CMOS
输入
15 T3
IN
+5V
400k
16 T4
IN
+5V
22 T5
IN
T4
400k
T5
T5
OUT
19
T4
OUT
1
T3
T3
OUT
2
RS-232
输出
T2
T2
OUT
4
T1
T1
OUT
3
V
CC
T4
OUT
1
T3
OUT
2
T1
OUT
3
T2
OUT
4
R2
IN
5
R2
OUT
6
T2
IN
7
T1
IN
8
R1
OUT
9
R1
IN
10
GND 11
V
CC
12
24 R3
IN
23 R3
OUT
22 T5
IN
21 SHDN
MAX235
20 EN
19 T5
OUT
18 R4
IN
17 R4
OUT
16 T4
IN
15 T3
IN
14 R5
OUT
13 R5
IN
9 R1
OUT
T1
5k
R1
IN
10
6 R2
OUT
R2
5k
R2
IN
5
DIP
TTL / CMOS
输出
23 R3
OUT
R3
5k
R3
IN
24
RS-232
输入
17 R4
OUT
R4
5k
R4
IN
18
14 R5
OUT
R5
5k
R5
IN
13
20 EN
GND
11
SHDN
21
图13. MAX235引脚配置和典型工作电路
22
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