+5V-Powered, Multichannel RS-232
Drivers/Receivers
+5V
TOP VIEW
0.1
28
CC
27
CC
V
V
+5V
400kΩ
T IN
1
3
4
11
12
18
17
T OUT
1
+5V
+5V
ENR
ENR
V
V
1
2
CC
28
27
26
25
24
400kΩ
400kΩ
400kΩ
400kΩ
CC
T IN
2
T IN
1
ENT
3
T OUT
2
T IN
2
T IN
3
4
T IN
3
MAX225
R OUT
1
T IN
4
5
25
24
T OUT
3
+5V
+5V
R OUT
2
23 T IN
6
5
R OUT
3
R OUT
22
7
4
T IN
4
R IN
3
T OUT
4
21 R OUT
5
8
R IN
2
R IN
9
20
19
18
17
5
T OUT
5
T IN
5
R IN
1
R IN
4
10
11
12
13
14
23
26
16
15
T OUT
1
T OUT
3
ENT
T OUT
2
T OUT
5
T OUT
4
R OUT
1
R IN
1
GND
GND
T OUT
5
16
15
5
10
T OUT
5
5kΩ
R IN
R OUT
2
2
SO
6
7
9
8
5kΩ
R IN
R OUT
3
3
MAX225 FUNCTIONAL DESCRIPTION
5 RECEIVERS
5kΩ
R IN
5 TRANSMITTERS
R OUT
4
4
22
21
19
20
2 CONTROL PINS
5kΩ
R IN
1 RECEIVER ENABLE (ENR)
1 TRANSMITTER ENABLE (ENT)
R OUT
5
5
5kΩ
ENR
ENR
1
2
PINS (ENR, GND, V , T OUT) ARE INTERNALLY CONNECTED.
CONNECT EITHER OR BOTH EXTERNALLY. T OUT IS A SINGLE DRIVER.
5
GND
14
CC
5
GND
13
Figure 7. MAX225 Pin Configuration and Typical Operating Circuit
18 ______________________________________________________________________________________
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
