MAX220–MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
+5V
0.1μF
TOP VIEW
28
27
V
CC
V
CC
+5V
400kΩ
T1IN
T2IN
T3IN
T4IN
3
4
11
12
18
17
+
T1OUT
T2OUT
T3OUT
+5V
+5V
ENR
ENR
T1IN
T2IN
V
1
2
28 CC
400kΩ
400kΩ
400kΩ
400kΩ
V
27 CC
ENT
26
3
T3IN
25
4
MAX225
R1OUT
R2OUT
R3OUT
R3IN
T4IN
5
24
25
24
+5V
+5V
23 T5IN
6
R4OUT
7
22
T4OUT
T5OUT
21 R5OUT
8
R2IN
R1IN
R5IN
20
9
T5IN
ENT
R4IN
10
11
12
13
14
19
18
17
23
26
16
15
T1OUT
T2OUT
T3OUT
T4OUT
T5OUT
T5OUT
T5OUT
R1IN
R1OUT
R2OUT
R3OUT
R4OUT
R5OUT
GND
GND
16
15
5
10
5kΩ
R2IN
5kΩ
R3IN
5kΩ
R4IN
5kΩ
R5IN
5kΩ
SO
6
7
9
8
MAX225 FUNCTIONAL DESCRIPTION
5 RECEIVERS
5 TRANSMITTERS
22
21
19
20
2 CONTROL PINS
1 RECEIVER ENABLE (ENR)
1 TRANSMITTER ENABLE (ENT)
ENR
ENR
1
2
PINS (ENR, GND, V , T5OUT) ARE INTERNALLY CONNECTED.
CC
CONNECT EITHER OR BOTH EXTERNALLY. T5OUT IS A SINGLE DRIVER.
GND
14
GND
13
ꢁigure 7. MAX225 Pin Configuration and Typical Operating Circuit
18
Maxim Integrated
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
