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