+5V-Powered, Multichannel RS-232
Drivers/Receivers
MAX220–MAX249
+5V INPUT
C3
TOP VIEW
C5
C1+ 1
V+ 2
C1- 3
C2+ 4
C2- 5
V- 6
T2OUT 7
R2IN 8
+
16 V
CC
15 GND
14 T1OUT
C1
C2
16
V
CC
C1+
+5V TO +10V
3 C1-
VOLTAGE DOUBLER
4
C2+
+10V TO -10V
5 C2- VOLTAGE INVERTER
1
+5V
400kΩ
11 T1IN
V+ 2 +10V
6
-10V
C4
V-
MAX220
MAX232
MAX232A
13 R1IN
12 R1OUT
11 T1IN
10 T2IN
9
R2OUT
TTL/CMOS
INPUTS
T1OUT 14
RS-232
OUTPUTS
T2OUT 7
+5V
400kΩ
10 T2IN
12 R1OUT
DIP/SO
CAPACITANCE (μF)
DEVICE
C1 C2 C3 C4 C5
MAX220
0.047 0.33 0.33 0.33 0.33
MAX232
1.0 1.0 1.0 1.0 1.0
MAX232A
0.1 0.1 0.1 0.1 0.1
TTL/CMOS
OUTPUTS
R1IN 13
5kΩ
RS-232
INPUTS
9 R2OUT
R2IN 8
5kΩ
GND
15
Figure 5. MAX220/MAX232/MAX232A Pin Configuration and Typical Operating Circuit
+5V INPUT C3
ALL CAPACITORS = 0.1μF
C5
17
VCC
3 +10V
C1+
+5V TO +10V
V+
4 C1- VOLTAGE DOUBLER
5
C2+
7 -10V
+10V TO -10V
V-
6 C2-
C4
VOLTAGE INVERTER
2
+5V
400kΩ
12 T1IN
TTL/CMOS
INPUTS
+5V
400kΩ
11 T2IN
(EXCEPT MAX220)
T2OUT 8
(EXCEPT MAX220)
T1OUT 15
RS-232
OUTPUTS
TOP VIEW
(N.C.) EN 1
C1+ 2
V+ 3
C1- 4
C2+ 5
C2- 6
V- 7
T2OUT 8
R2IN 9
+
(N.C.) EN 1
18 SHDN
17 V
CC
16 GND
15 T1OUT
C1+ 2
V+ 3
C1- 4
C2+ 5
C2- 6
V- 7
T2OUT
8
+
20 SHDN
19 V
CC
18 GND
17 T1OUT
C1
C2
MAX222
MAX242
MAX222
MAX242
16 N.C.
15 R1IN
14 R1OUT
13 N.C.
12 T1IN
11 T2IN
TTL/CMOS
OUTPUTS
14 R1IN
13 R1OUT
12 T1IN
11 T2IN
10 R2OUT
R2IN 9
R2OUT 10
13 R1OUT
R1IN 14
5kΩ
RS-232
INPUTS
DIP/SO
SSOP
10 R2OUT
1 (N.C.) EN
R2IN 9
5kΩ
GND
16
SHDN
18
( ) ARE FOR MAX222 ONLY.
PIN NUMBERS IN TYPICAL OPERATING CIRCUIT ARE FOR DIP/SO PACKAGES ONLY.
Figure 6. MAX222/MAX242 Pin Configurations and Typical Operating Circuit
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17
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
