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