Specifications

MAX220–MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
______________________________________________________________________________________ 27
GND
18
4R3
OUT
40
R4
OUT
R3
IN
R4
IN
5k
5k
13
10
R2
OUT
R2
IN
5k
RS-232
INPUTS
TTL/CMOS
OUTPUTS
RS-232
OUTPUTS
TTL/CMOS
INPUTS
R2
16
17
R1
OUT
R1
IN
5k
R1
R3
R4
36
35
R5
OUT
R5
IN
5k
R5
7
15
T1
IN
T1
OUT
+5V
400k
+5V
14
8
T2
IN
T2
OUT
T2
400k
37
T3
OUT
6
T3
IN
+5V
T3
400k
C1+
C1-
1.0µF
25
V
CC
+5V INPUT
19
30
1.0µF
26
1.0µF
+5V TO +10V
VOLTAGE DOUBLER
3
1.0µF
T1
+5V
2
41
T5
IN
T5
OUT
T5
400k
5
38
T4
IN
T4
OUT
+5V
400k
T4
27
C2+
C2-
28
1.0µF
29
+5V TO -10V
VOLTAGE INVERTER
V+
39
EN
42
43
Plastic FP
MAX240
SHDN
EN
T5
OUT
R4
IN
R4
OUT
R5
OUT
R5
IN
N.C.
N.C.
T3
IN
T4
IN
R2
OUT
T2
IN
T1
IN
R1
OUT
R1
IN
N.C.
N.C.
N.C.
N.C.
V
CC
GND
R2
IN
N.C. T4
OUT
T2
OUT
T1
OUT
T3
OUT
N.C. R3
IN
R3
OUT
N.C. T5
IN
N.C.
C1+
C2
V+
C1-
C2+
N.C.
V-
N.C. N.C. N.C.
33
32 31 30 29 28 27 26 25 24 23
34
35
36
37
38
39
40
41
42
43
44
1 2 3 4 5 6 7 8 9 10 11
22
21
20
19
18
17
16
15
14
13
12
SHDN
TOP VIEW
V-
Figure 18. MAX240 Pin Configuration and Typical Operating Circuit