MAX220–MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
+5V INPUT
1.0μF
TOP VIEW
7
V
CC
+5V
+5V
400kΩ
400kΩ
+
T1OUT
5
T1IN
T2IN
2
1
T2IN
T1IN
R2OUT
R2IN
1
2
20
19
18
17
16
15
14
13
12
11
TTL/CMOS
INPUTS
RS-232
OUTPUTS
R1OUT
R1IN
T2OUT
V-
3
T2OUT
R1IN
18
4
4
R1OUT
3
MAX233
T1OUT
GND
C2-
5
MAX233A
5kΩ
TTL/CMOS
OUTPUTS
C2+
6
RS-232
INPUTS
V
CC
V+ (C1-)
C1- (C1+)
V- (C2+)
C2+ (C2-)
7
R2OUT
R2IN 19
20
(V+) C1+
GND
8
8 (13)
11 (12)
5kΩ
9
C1+
C1-
V-
DO NOT MAKE
CONNECTIONS TO
THESE PINS
C2+
13 (14)
12 (10)
15
16
(V-) CS-
10
C2+
C2-
INTERNAL -10V
POWER SUPPLY
17
10 (11)
DIP/SO
V-
CS-
14 (8)
INTERNAL +10V
POWER SUPPLY
V+
GND
6
GND
9
PIN NAMES IN ( ) ARE FOR SO PACKAGE.
ꢁigure ±±. MAX233/MAX233A Pin Configuration and Typical Operating Circuit
+5V INPUT
1.0μF
TOP VIEW
6
1.0μF
7
V
8
C1+
CC
+5V TO +10V
VOLTAGE DOUBLER
V+
V-
1.0μF
1.0μF
9
C1-
C2+
10
+10V TO -10V
VOLTAGE INVERTER
12
+
11
C2-
1.0μF
T1OUT
T2OUT
T2IN
T3OUT
T4OUT
T4IN
T3IN
V-
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
+5V
400kΩ
400kΩ
T1IN
T1OUT
T2OUT
T3OUT
T4OUT
4
3
1
2
T1
T2
T3
T4
T1IN
MAX234
+5V
+5V
+5V
GND
T2IN
T3IN
V
C2-
CC
RS-232
OUTPUTS
C1+
V+
C2+
TTL/CMOS
INPUTS
400kΩ
C1-
13
16
15
DIP/SO
400kΩ
14 T4IN
GND
5
ꢁigure ±2. MAX234 Pin Configuration and Typical Operating Circuit
Maxim Integrated
21
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
