+5V-Powered, Multichannel
RS-232 Drivers/Receivers
MAX220–MAX249
TOP VIEW
+5V INPUT
1.0μF
1.0μF
1.0μF
9
10
V
11
15
CC
C1+
V+
V-
+5V TO +10V
VOLTAGE DOUBLER
1.0μF
1.0μF
12
13
C1-
C2+
+10V TO -10V
VOLTAGE INVERTER
14
C2-
+5V
+5V
+5V
+5V
400kΩ
T1
+
T3OUT
T1OUT
T2OUT
R1IN
1
2
3
4
5
6
7
8
9
24 T4OUT
23 R2IN
22 R2OUT
21 T5IN
20 T5OUT
19 T4IN
18 T3IN
17 R3OUT
16 R3IN
15 V-
T1OUT
T2OUT
T3OUT
T1IN
7
2
400kΩ
T2IN
T3IN
6
3
1
T2
MAX237
R1OUT
T2IN
400kΩ
18
TTL/CMOS
INPUTS
RS-232
OUTPUTS
T3
T1IN
400kΩ
GND
T4OUT 24
T5OUT 20
19 T4IN
21 T5IN
V
T4
CC
+5V
C1+ 10
V+ 11
400kΩ
14 C2-
T5
C1- 12
13 C2+
DIP/SO
5
R1OUT
R1IN
5kΩ
4
R1
22
R2IN
5kΩ
R2OUT
23
RS-232
INPUTS
TTL/CMOS
OUTPUTS
R2
R3
R3OUT
R3IN 16
5kΩ
17
GND
8
µigure ±5ꢂ ꢄMAX.4 Pin Configuration and ꢅypical Operating Circuit
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