+ 5V供电，多通道RS - 232
驱动器/接收器
MAX220–MAX249
+ 5V输入
顶视图
8 C1+
10 C1-
1.0F
7
VCC
V+ 9
+ 5V至+ 10V
倍压
V-
13
1.0F
1.0F
1.0F
T3
OUT
1
20 T4
OUT
19 T5
IN
18北卡罗来纳州
17 SHDN
1.0F
T1
OUT
2
T2
OUT
3
T2
IN
4
T1
IN
5
GND 6
V
CC
7
C1+ 8
V+ 9
C1- 10
11
+ 10V至-10V
C2+
12
C2-高压变频器
+5V
400k
5 T1
IN
+5V
4 T2
IN
+5V
400k
T1
400k
T2
T1
OUT
2
MAX230
16 T5
OUT
15 T4
IN
14 T3
IN
13 V-
12 C2-
11 C2+
TTL / CMOS
输入
14 T3
IN
T2
OUT
3
T3
+5V
400k
T3
OUT
1
RS-232
输出
15 T4
IN
+5V
T4
400k
T4
OUT
20
DIP / SO
19 T5
IN
北卡罗来纳×18
T5
GND
6
T5
OUT
16
17
SHDN
图9. MAX230引脚配置和典型工作电路
+ 5V输入
顶视图
1
1.0F
C+ 1
C-
V-
2
3
14 V+
13 V
CC
12 GND
C+ 1
C- 2
V- 3
T2
OUT
4
R2
IN
5
R2
OUT
6
T2
IN
7
北卡罗来纳州8
16 V+
15 V
CC
14 GND
TTL / CMOS
输入
7
(11)
TTL / CMOS
输出
9
(10)
8
T1
IN
2
1.0F
13 (15)
C1+
C1-
+5V
400k
T1
400k
T2
IN
R1
OUT
T2
R1
5k
6 R2
OUT
V
CC
+ 12V至-12V
电压转换器
+ 7.5V至+ 12V
V+
V-
14
3
(16)
C2
1.0F
(13)
T1
OUT
11
+5V
RS-232
输出
T2
OUT
4
R1
IN
10
(12)
T2
OUT
4
R2
IN
5
R2
OUT
6
T2
IN
7
MAX231
11 T1
OUT
10 R1
IN
9
8
R1OUT
T1
IN
MAX231
13 T1
OUT
12 R1
IN
11 R1
OUT
10 T1
IN
9
北卡罗来纳州
DIP
SO
RS-232
输入
R2
IN
5
R2
5k
GND
引脚号（ ）是SO封装
12 (14)
图10. MAX231引脚配置和典型工作电路
20
______________________________________________________________________________________
