Datasheet

MAX220–MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
24 ______________________________________________________________________________________
GND
8
23
R2
OUT
RS-232
INPUTS
TTL/CMOS
OUTPUTS
17
16
R3
OUT
R2
IN
R3
IN
5kΩ
5kΩ
5
4
R1
OUT
R1
IN
5kΩ
RS-232
OUTPUTS
TTL/CMOS
INPUTS
R1
R2
R3
2
7
T1
IN
T1
OUT
+5V
T1
400kΩ
6
3
T2
IN
+5V
T2
OUT
T2
400kΩ
18
T3
OUT
1
T3
IN
+5V
T3
400kΩ
21
20
T5
IN
T5
OUT
+5V
T5
400kΩ
11
C1+
C1-
1.0μF
10
12
13
14
15
+5V INPUT
C2+
C2-
V
CC
+5V TO +10V
VOLTAGE DOUBLER
9
1.0μF
1.0μF
+10V TO -10V
VOLTAGE INVERTER
22
24
23
22
21
20
19
18
17
1
2
3
4
5
6
7
8
T4
OUT
R2
IN
R2
OUT
T5
IN
R1
IN
T2
OUT
T1
OUT
T3
OUT
T4
IN
T3
IN
R3
OUT
GND
T1
IN
T2
IN
R1
OUT
16
15
14
13
9
10
11
12
R3
IN
V-
C2-
C2+C1-
V+
C1+
V
CC
DIP/SO
MAX237
T5
OUT
1.0μF
1.0μF
19
24
T4
IN
T4
OUT
+5V
T4
400kΩ
V+
V-
TOP VIEW
Figure 15. MAX237 Pin Configuration and Typical Operating Circuit