+5V-Powered, Multichannel RS-232
Drivers/Receivers
TOP VIEW
7.5V TO 13.2V
INPUT
+5V INPUT
1.0µF
4
5
V
V+
CC
6
8
C1+
V-
+10V TO -10V
VOLTAGE INVERTER
1.0µF
7
1.0µF
C1-
+5V
+5V
400kΩ
T1
400kΩ
T2
T1
T1
24
23
19
20
OUT
IN
R1
1
2
24 T1
23 T2
OUT
IN
R1
IN
IN
T2
OUT
T2
T3
IN
TTL/CMOS
INPUTS
RS-232
OUTPUTS
GND
3
22 R2
21 R2
20 T2
19 T1
18 R3
17 R3
OUT
+5V
V
4
CC
IN
400kΩ
T3
MAX239
V+
5
OUT
OUT
IN
T3
13
2
16
1
OUT
IN
C+
C-
V-
6
7
8
OUT
IN
R1
R1
IN
OUT
R1
R2
R3
R5
9
16 T3
IN
OUT
OUT
5kΩ
R5
R4
10
11
15 N.C.
14 EN
R2
5kΩ
R3
22 R2
IN
21
18
12
OUT
R4 12
13 T3
OUT
IN
DIP/SO
17
R3
OUT
IN
RS-232
INPUTS
TTL/CMOS
OUTPUTS
5kΩ
R4
11 R4
OUT
IN
R4
R5
5kΩ
R5
R5
EN
10
14
9
OUT
IN
5kΩ
15
N.C.
GND
3
Figure 17. MAX239 Pin Configuration and Typical Operating Circuit
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MAXIM [ MAXIM INTEGRATED PRODUCTS ]
