+5V-Powered, Multichannel RS-232
Drivers/Receivers
+5V INPUT
1.0µF
TOP VIEW
7
V
+5V
+5V
CC
400k
400k
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
C2-
OUT
5
MAX233A
5k
5k
GND
TTL/CMOS
OUTPUTS
C2+
6
RS-232
OUTPUTS
V
V+ (C1-)
C1- (C1+)
V- (C2+)
C2+ (C2-)
CC
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
POWER SUPPLY
17
10 (11)
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
CC
8
C1+
+5V TO +10V
V+
V-
1.0µF
1.0µF
9
VOLTAGE DOUBLER
C1-
C2+
10
+10V TO -10V
VOLTAGE INVERTER
12
11
T1
T2
T3
T4
T4
T3
V-
C2-
OUT
OUT
1
2
3
4
5
6
7
8
1.0µF
OUT
OUT
IN
16
15
14
13
12
11
10
9
+5V
400k
400k
400k
400k
T2
IN
IN
T1
T1
4
1
OUT
IN
T1
T1
MAX234
IN
+5V
GND
T2
IN
T3
IN
IN
T2
T3
3
3
V
OUT
C2-
C2+
C1-
CC
T2
T3
T4
+5V
+5V
RS-232
OUTPUTS
C1+
V+
TTL/CMOS
INPUTS
13
16
15
OUT
DIP/SO
14 T4
T4
OUT
GND
5
Figure 12. MAX234 Pin Configuration and Typical Operating Circuit
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