MAX220–MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
+5V INPUT
1.0μF
TOP VIEW
7
1.0μF
1.0μF
8
V
9
CC
C1+
C1-
V+
V-
+5V TO +10V
10
1.0μF
1.0μF
VOLTAGE DOUBLER
+
11
12
T3OUT
T1OUT
T2OUT
T2IN
T4OUT
T5IN
N.C.
1
2
20
19
18
17
16
15
14
13
12
11
C2+
C2-
+10V TO -10V
VOLTAGE INVERTER
13
+5V
3
400kΩ
T1
400kΩ
T2
SHDN
T5OUT
T4IN
T3IN
V-
4
5 T1IN
T1OUT
T2OUT
T3OUT
T4OUT
T5OUT
2
MAX230
T1IN
GND
+5V
5
6
T2IN
4
3
V
CC
+5V
7
400kΩ
T3
400kΩ
T4
400kΩ
T5
C1+
V+
8
T3IN
T4IN
TTL/CMOS
INPUTS
14
15
1
RS-232
OUTPUTS
C2-
9
+5V
+5V
C1-
C2+
10
20
DIP/SO
T5IN
19
18
16
17
N.C.x
SHDN
GND
6
ꢁigure 9. MAX230 Pin Configuration and Typical Operating Circuit
+5V INPUT
TOP VIEW
+7.5V TO +12V
1.0μF
13 (15)
1
2
14
3
(16)
V
CC
C1+
C1-
V+
V-
+12V TO -12V
VOLTAGE CONVERTER
1.0μF
C2
1.0μF
+
+
+5V
C+
C-
V-
V+
V
1
2
3
4
5
6
7
8
C+
C-
1
2
3
4
5
6
7
14 V+
13
16
400kΩ
(10)
(13)
(12)
V
CC
15 CC
T1OUT
11
T1IN
+5V
8
T1
GND
V-
12 GND
11 T1OUT
10 R1IN
14
13
12
11
10
9
TTL/CMOS
INPUTS
RS-232
OUTPUTS
T1OUT
R1IN
T2OUT
R2IN
MAX231
T2OUT
R2IN
R2OUT
T2IN
MAX231
400kΩ
T2OUT
R1IN
4
T2IN
7
T2
R2OUT
T2IN
R1OUT
T1IN
9
8
R1OUT
T1IN
(11)
R1OUT
10
9
R1
R2
TTL/CMOS
OUTPUTS
N.C.
5kΩ
RS-232
INPUTS
N.C.
DIP
R2OUT
R2IN
5
SO
6
5kΩ
GND
PIN NUMBERS IN ( ) ARE FOR SO PACKAGE.
12 (14)
ꢁigure ±0. MAX23± Pin Configurations and Typical Operating Circuit
20
Maxim Integrated
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
