MAX220–MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
______________________________________________________________________________________ 19
GND
10
27R3
OUT
23
R4
OUT
R3
IN
R4
IN
5kΩ
5kΩ
5
4
R2
OUT
R2
IN
5kΩ
RS-232
INPUTS
LOGIC
OUTPUTS
RS-232
OUTPUTS
TTL/CMOS
INPUTS
R2
8
9
R1
OUT
R1
IN
5kΩ
R1
R3
R4
19
18
R5
OUT
R5
IN
5kΩ
R5
2
7
T1
IN
T1
OUT
+5V
400kΩ
+5V
6
3
T2
IN
T2
OUT
T2
400kΩ
20
T3
OUT
1
T3
IN
+5V
T3
400kΩ
C1+
C1-
1.0µF
12
V
CC
+5V INPUT
11
17
1.0µF
13
1.0µF
+5V TO +10V
VOLTAGE DOUBLER
26
1.0µF
T1
28
21
T4
IN
T4
OUT
+5V
400kΩ
T4
14
C2+
C2-
15
1.0µF
16
+10V TO -10V
VOLTAGE INVERTER
V+
22
EN (EN)
24
25
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
T4
OUT
R3
IN
R3
OUT
SHDN (SHDN)
R4
IN*
C2+
R4
OUT*
T4
IN
T3
IN
R5
OUT*
R5
IN*
V-
C2-
C1-
V+
C1+
V
CC
GND
R1
IN
R1
OUT
T1
IN
T2
IN
R2
OUT
R2
IN
T2
OUT
T1
OUT
T3
OUT
Wide SO/
SSOP
MAX223
MAX241
EN (EN)
SHDN
(SHDN)
*R4 AND R5 IN MAX223 REMAIN ACTIVE IN SHUTDOWN
NOTE: PIN LABELS IN ( ) ARE FOR MAX241
V-
TOP VIEW
Figure 8. MAX223/MAX241 Pin Configuration and Typical Operating Circuit
