+5V-Powered, Multichannel RS-232
Drivers/Receivers
+5V INPUT
C3
TOP VIEW
C5
16
V
1
CC
2
C1+
V+
V
1
2
3
4
5
6
7
8
CC
16
15
14
13
12
11
10
9
C1+
C1-
+10V
V+
V-
+5V TO +10V
VOLTAGE DOUBLER
C1
C2
3
4
GND
T1
6
-10V
C4
C2+
C2-
+10V TO -10V
VOLTAGE INVERTER
C1-
OUT
5
R1
R1
T1
C2+
C2-
V-
MAX220
MAX232
MAX232A
IN
+5V
400k
OUT
T1
T1
11
14
IN
OUT
IN
IN
+5V
TTL/CMOS
INPUTS
RS-232
OUTPUTS
T2
T2
R2
OUT
400k
T2
T2
OUT
7
R2
10
12
OUT
IN
IN
DIP/SO
R1
R2
R1
I
N
13
OUT
TTL/CMOS
OUTPUTS
RS-232
INPUTS
5k
CAPACITANCE (µF)
DEVICE
MAX220
MAX232
C1 C2 C3 C4 C5
4.7 4.7 10 10 4.7
1.0 1.0 1.0 1.0 1.0
8
9
R2
OUT
IN
5k
MAX232A 0.1 0.1 0.1 0.1 0.1
GND
15
Figure 5. MAX220/MAX232/MAX232A Pin Configuration and Typical Operating Circuit
+5V INPUT
17
C3
TOP VIEW
ALL CAPACITORS = 0.1µF
C5
V
2
CC
3
7
+10V
C1+
+5V TO +10V
V+
V-
C1
4
5
(N.C.) EN
C1+
SHDN
C1-
VOLTAGE DOUBLER
1
2
20
19
18
17
16
15
14
13
12
11
C2+
C2-
-10V
C4
(N.C.) EN
C1+
SHDN
V
CC
1
2
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
10
+10V TO -10V
VOLTAGE INVERTER
C2
6
V+
V
CC
GND
3
+5V
C1-
V+
GND
T1
4
OUT
(EXCEPT MAX220)
400k
12 T1
C1-
MAX222
MAX242
C2+
C2-
V-
T1
N.C.
5
OUT
T1
15
IN
+5V
400k
OUT
MAX222
MAX242
C2+
C2-
V-
R1
IN
R1
IN
6
TTL/CMOS
INPUTS
RS-232
(EXCEPT MAX220)
R1
OUTPUTS
R1
7
OUT
OUT
11 T2
T2
8
IN
OUT
T2
OUT
T1
IN
N.C.
8
T2
R2
IN
OUT
T1
IN
T2
IN
9
13 R1
R1
IN
14
OUT
R2
IN
R2
R2
T2
IN
OUT
10
OUT
TTL/CMOS
OUTPUTS
RS-232
INPUTS
5k
5k
10
1
R2
R2
IN
9
OUT
DIP/SO
SSOP
(N.C.)
EN
18
( ) ARE FOR MAX222 ONLY.
PIN NUMBERS IN TYPICAL OPERATING CIRCUIT ARE FOR DIP/SO PACKAGES ONLY.
SHDN
GND
16
Figure 6. MAX222/MAX242 Pin Configurations and Typical Operating Circuit
______________________________________________________________________________________ 17
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
