Datasheet

MAX220–MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
______________________________________________________________________________________ 25
GND
8
3
R2
OUT
22
23
R3
OUT
R2
IN
R3
IN
5kΩ
5kΩ
6
7
R1
OUT
R1
IN
5kΩ
RS-232
OUTPUTS
TTL/CMOS
INPUTS
RS-232
INPUTS
TTL/CMOS
OUTPUTS
R1
R2
R3
17
16
R4
OUT
R4
IN
5kΩ
R4
2
5
T1
IN
T1
OUT
+5V
400kΩ
+5V
18
1
T2
IN
T2
OUT
T2
400kΩ
19
T3
OUT
24
T3
IN
+5V
T3
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
4
1.0μF
1.0μF
21
20
T4
IN
T4
OUT
+5V
T4
400kΩ
T1
24
23
22
21
20
19
18
17
1
2
3
4
5
6
7
8
T3
OUT
R3
IN
R3
OUT
T4
IN
R2
OUT
R2
IN
T1
OUT
T2
OUT
TOP VIEW
T3
IN
T2
IN
R4
OUT
GND
R1
IN
R1
OUT
T1
IN
16
15
14
13
9
10
11
12
R4
IN
V-
C2-
C2+C1-
V+
C1+
V
CC
DIP/SO
MAX238
T4
OUT
V+
V-
Figure 16. MAX238 Pin Configuration and Typical Operating Circuit