+5V-Powered, Multichannel RS-232
Drivers/Receivers
+5V INPUT
TOP VIEW
1.0µF
7
1.0µF
1.0µF
8
V
9
CC
C1+
C1-
V+
V-
+5V TO +10V
10
1.0µF
1.0µF
VOLTAGE DOUBLER
T3
T4
T5
OUT
1
2
OUT
20
19
18
17
16
15
14
13
12
11
11
12
C2+
C2-
+10V TO -10V
VOLTAGE INVERTER
13
T1
T2
OUT
IN
OUT
N.C.
+5V
3
400k
400k
T2
IN
SHDN
4
5 T1
T1
T2
T3
T4
T5
2
IN
IN
OUT
OUT
OUT
1 T
T1
MAX230
T1
T5
IN
5
+5V
+5V
+5V
OUT
GND
T4
IN
6
T2
4
14
15
3
1
T2
T3
T4
T5
V
T3
IN
CC
7
400k
400k
400k
C1+
V+
V-
8
T3
T4
TTL/CMOS
INPUTS
RS-232
OUTPUTS
IN
IN
C2-
C2+
9
C1-
10
OUT 20
+5V
DIP/SO
T5
19
18
16
17
OUT
IN
N.C.x
SHDN
GND
6
Figure 9. MAX230 Pin Configuration and Typical Operating Circuit
+5V INPUT
TOP VIEW
+7.5V TO +12V
1.0µF
13 (15)
1
2
14
3
(16)
V
CC
C1+
C1-
V+
V-
+12V TO -12V
VOLTAGE CONVERTER
1.0µF
C2
1.0µF
+5V
C+
V+
V
1
2
3
4
5
6
7
8
C+
C-
V-
1
2
3
4
5
6
7
14 V+
13
16
400k
T1
(10)
(11)
(13)
(12)
C-
V-
V
15 CC
CC
T1
T2
11
T1
OUT
8
IN
GND
14
12 GND
11 T1
+5V
TTL/CMOS
INPUTS
RS-232
OUTPUTS
T1
13
T2
R2
MAX231
T2
R2
MAX231
OUT
OUT
OUT
OUT
400k
T2
R1
R1
T1
R2
R2
10 R1
12
11
10
9
IN
IN
4
IN
IN
T2
IN
7
OUT
9
8
R1
T1
OUT
OUT
OUT
OUT
R1
10
R1
9
OUT
IN
R1
T2
IN
T2
IN
IN
IN
TTL/CMOS
INPUTS
N.C.
5k
RS-232
INPUTS
N.C.
DIP
R2
R2
5
SO
OUT
6
IN
R2
5k
GND
PIN NUMBERS IN ( ) ARE FOR SO PACKAGE
12 (14)
Figure 10. MAX231 Pin Configurations and Typical Operating Circuit
20 ______________________________________________________________________________________
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
