+5V-Powered, Multichannel RS-232
Drivers/Receivers
+5V INPUT
1.0µF
TOP VIEW
19
1.0µF
1.0µF
25
V
C1+
CC
26
30
V+
V-
+5V TO +10V
VOLTAGE DOUBLER
1.0µF
1.0µF
27
28
C1-
C2+
+5V TO -10V
VOLTAGE INVERTER
29
C2-
+5V
400kΩ
T1
T1
15
7
OUT
OUT
IN
T1
+5V
400kΩ
T2
T2
14 T2
8
6
IN
+5V
400kΩ
T3
T3
T3
IN
RS-232
OUTPUTS
37
OUT
TTL/CMOS
INPUTS
+5V
400kΩ
N.C.
R2
12
13
14
15
16
17
18
19
20
21
22
44
43
42
41
40
39
38
37
36
35
34
N.C.
SHDN
EN
T4
T5
T4
T5
38
2
5
OUT
IN
T4
OUT
+5V
T2
IN
IN
400kΩ
T1
R1
T5
OUT
41
IN
OUT
R4
R4
OUT
IN
T5
R1
IN
OUT
IN
MAX240
GND
T4
T3
R1
16 R1
IN 17
OUT
OUT
R1
V
CC
IN
5kΩ
N.C.
N.C.
N.C.
R5
R5
OUT
IN
N.C.
R2
13 R2
IN
10
4
R2
5kΩ
R3
3
R3
RS-232
INPUTS
OUT
OUT
OUT
IN
TTL/CMOS
OUTPUTS
R3
R4
R5
5kΩ
Plastic FP
39 R4
R4
40
IN
5kΩ
R5
R5
36
35
43
IN
5kΩ
SHDN
42 EN
GND
18
Figure 18. MAX240 Pin Configuration and Typical Operating Circuit
______________________________________________________________________________________ 27
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
