Datasheet

MAX220–MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
18 ______________________________________________________________________________________
13
14
28
27
26
25
24
23
22
21
1
2
3
4
5
6
7
8
V
CC
V
CC
V
CC
400kΩ
400kΩ
400kΩ
400kΩ
400kΩ
T
1
OUT
+5V
+5V
0.1
+5V
3
28 27
4
25
24
23
26
5
6
7
22
GND
ENR
ENR
GND
21
+5V
+5V
+5V
T
2
OUT
T
3
OUT
T
4
OUT
5kΩ
5kΩ
5kΩ
5kΩ
5kΩ
14
13
2
1
T
5
OUT
T
5
OUT
R
1
IN
R
2
IN
R
3
IN
R
4
IN
R
5
IN
T
1
IN
11
12
18
17
16
15
10
9
8
19
20
T
2
IN
T
3
IN
T
4
IN
T
5
IN
ENT
R
2
OUT
R
3
OUT
R
4
OUT
PINS (ENR, GND, V
CC
, T
5
OUT) ARE INTERNALLY CONNECTED.
CONNECT EITHER OR BOTH EXTERNALLY. T
5
OUT IS A SINGLE DRIVER.
R
5
OUT
R
1
OUT
V
CC
ENT
T
3
IN
T
2
IN
T
1
IN
ENR
ENR
T
4
IN
T
5
IN
R
4
OUT
R
5
OUT
R
3
IN
R
3
OUT
R
2
OUT
R
1
OUT
20
19
18
17
9
10
11
12
R
5
IN
R
4
IN
T
3
OUT
T
4
OUT
T
2
OUT
T
1
OUT
R
1
IN
R
2
IN
SO
MAX225
16
15
T
5
OUT
MAX225 FUNCTIONAL DESCRIPTION
5 RECEIVERS
5 TRANSMITTERS
2 CONTROL PINS
1 RECEIVER ENABLE (ENR)
1 TRANSMITTER ENABLE (ENT)
T
5
OUT
GND
GND
TOP VIEW
Figure 7. MAX225 Pin Configuration and Typical Operating Circuit