+5V-Powered, Multichannel RS-232
Drivers/Receivers
+5V INPUT
1.0µF
TOP VIEW
7
V
CC
+5V
+5V
400kΩ
400kΩ
T1
T2
5
T1
OUT
OUT
2
1
IN
T2
R2
R2
IN
1
2
OUT
20
19
18
17
16
15
14
13
12
11
T1
TTL/CMOS
INPUTS
IN
IN
RS-232
OUTPUTS
R1
T1
OUT
T2
V-
3
OUT
18
4
T2
IN
R1
IN
4
R1
OUT
R1
IN
3
MAX233
MAX233A
C2-
OUT
5
5kΩ
5kΩ
GND
TTL/CMOS
OUTPUTS
C2+
6
RS-232
INPUTS
V
CC
V+ (C1-)
C1- (C1+)
V- (C2+)
C2+ (C2-)
7
R2
R2 19
OUT
20
IN
(V+) C1+
GND
8
8 (13)
11 (12)
9
C1+
DO NOT MAKE
CONNECTIONS TO
THESE PINS
C2+
13 (14)
12 (10)
15
16
(V-) CS-
10
C1-
V-
C2+
C2-
INTERNAL -10
17
10 (11)
POWER SUPPLY
DIP/SO
V-
C2-
14 (8)
INTERNAL +10V
POWER SUPPLY
V+
GND
6
GND
9
( ) ARE FOR SO PACKAGE ONLY.
Figure 11. MAX233/MAX233A Pin Configuration and Typical Operating Circuit
+5V INPUT
6
1.0µF
TOP VIEW
1.0µF
7
V
8
C1+
CC
+5V TO +10V
VOLTAGE DOUBLER
V+
1.0µF
1.0µF
9
C1-
C2+
10
+10V TO -10V
VOLTAGE INVERTER
12
V-
11
C2-
1.0µF
T1
T2
T3
T4
T4
T3
V-
OUT
OUT
1
2
3
4
5
6
7
8
OUT
OUT
IN
16
15
14
13
12
11
10
9
+5V
400kΩ
400kΩ
T2
IN
IN
T1
IN
T1
4
3
1
OUT
OUT
OUT
T1
T2
T3
T4
T1
MAX234
IN
+5V
GND
T2
IN
T3
IN
IN
T2
T3
3
V
C2-
C2+
C1-
CC
+5V
+5V
RS-232
OUTPUTS
C1+
V+
TTL/CMOS
INPUTS
400kΩ
13
16
15
DIP/SO
400kΩ
14 T4
T4
OUT
GND
5
Figure 12. MAX234 Pin Configuration and Typical Operating Circuit
______________________________________________________________________________________ 21
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
