MAX220–MAX249
+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
6
-10V
C4
C2+
C2-
+10V TO -10V
VOLTAGE INVERTER
C1-
T1OUT
R1IN
5
C2+
C2-
MAX220
MAX232
MAX232A
+5V
R1OUT
T1IN
400kΩ
T1IN
T1OUT
11
14
V-
+5V
TTL/CMOS
INPUTS
RS-232
T2OUT
T2IN
400kΩ
T2IN
OUTPUTS
T2OUT
R1IN
7
R2OUT
R2IN
10
12
DIP/SO
R1OUT
R2OUT
13
TTL/CMOS
OUTPUTS
RS-232
INPUTS
5kΩ
CAPACITANCE (μF)
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
DEVICE
8
9
R2IN
5kΩ
GND
15
ꢁigure 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
C1-
VOLTAGE DOUBLER
V+
V-
+
C1
4
5
(N.C.) EN
C1+
SHDN
1
2
20
19
18
17
16
15
14
13
12
11
+
C2+
C2-
-10V
C4
(N.C.) EN
C1+
SHDN
V
1
2
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
10
CC
+10V TO -10V
VOLTAGE INVERTER
C2
6
V+
GND
T1OUT
N.C.
V
3
CC
+5V
400kΩ
12 T1IN
+5V
400kΩ
11 T2IN
C1-
V+
GND
4
(EXCEPT MAX220)
T1OUT
C1-
MAX222
MAX242
C2+
C2-
T1OUT
R1IN
5
15
MAX222
MAX242
C2+
C2-
R1IN
R1OUT
N.C.
6
TTL/CMOS
INPUTS
RS-232
OUTPUTS
(EXCEPT MAX220)
T2OUT
V-
R1OUT
T1IN
7
8
T2OUT
V-
8
T2OUT
R2IN
T1IN
T2IN
9
13 R1OUT
R1IN
14
R2IN
R2OUT
R2OUT
T2IN
10
TTL/CMOS
OUTPUTS
RS-232
INPUTS
5kΩ
10
1
R2OUT
(N.C.)
R2IN
9
DIP/SO
SSOP
EN
5kΩ
18
( ) ARE FOR MAX222 ONLY.
PIN NUMBERS IN TYPICAL OPERATING CIRCUIT ARE FOR DIP/SO PACKAGES ONLY.
SHDN
GND
16
ꢁigure 6. MAX222/MAX242 Pin Configurations and Typical Operating Circuit
Maxim Integrated
17
ROCHESTER [ Rochester Electronics ]
