+5V-Powered, Multichannel RS-232
Drivers/Receivers
+5V
TOP VIEW
1µF
40
V
CC
+5V
+5V
+5V
+5V
16 T OUT
T
T
OUT 24
A1
B1
T
ENR
1
2
3
4
5
6
7
8
9
40
V
CC
400kΩ
400kΩ
T
T
T
IN
IN
IN
39 ENT
A1
A2
A3
2 T IN
IN 38
B1
A1
38
37
36
35
34
33
32
31
T
T
T
T
IN
IN
IN
IN
B1
B2
B3
B4
17 T OUT
OUT 23
A2
B2
T
T
IN
A4
3 T IN
IN 37
B2
A2
R
OUT
OUT
OUT
OUT
A5
+5V
+5V
+5V
+5V
MAX245
18 T OUT
T
T
OUT 22
A3
B3
R
R
R
R
R
R
R
R
R
R
R
R
R
R
OUT
OUT
OUT
OUT
OUT
IN
A4
A3
A2
A1
R
B5
B4
B3
B2
400kΩ
400kΩ
4 T IN
T
IN 36
B3
A3
19 T OUT
A4
OUT 21
B4
OUT 10
IN 11
A1
30
29
28
27
26
25
24
23
22
21
5 T IN
A4
T
IN 35
B4
B1
B1
B2
B3
B4
B5
R
IN 12
IN 13
IN 14
IN 15
A2
A3
A4
A5
1
ENR
ENT 39
IN 29
R
IN
11 R IN
R
A1
B1
R
IN
R
IN
5kΩ
10 R OUT
5kΩ
T
T
T
T
OUT 16
OUT 17
OUT 18
OUT 19
IN
A1
A2
A3
A4
R
OUT 30
A1
B1
R
T
T
T
T
OUT
OUT
OUT
OUT
B1
B2
B3
B4
12 R IN
IN 28
B2
A2
5kΩ
9 R OUT
5kΩ
GND 20
R
OUT 31
A2
B2
R
DIP
13 R IN
IN 27
B3
A3
5kΩ
8 R OUT
5kΩ
R
OUT 32
A3
B3
R
MAX245 FUNCTIONAL DESCRIPTION
10 RECEIVERS
14 R IN
IN 26
B4
A4
5 A-SIDE RECEIVERS (R ALWAYS ACTIVE)
A5
5 B-SIDE RECEIVERS (R ALWAYS ACTIVE)
B5
5kΩ
7 R OUT
5kΩ
8 TRANSMITTTERS
R
OUT 33
A4
B4
R
4 A-SIDE TRANSMITTERS
2 CONTROL PINS
15 R IN
IN 25
B5
A5
1 RECEIVER ENABLE (ENR)
1 TRANSMITTER ENABLE (ENT)
5kΩ
6 R OUT
5kΩ
R
OUT 34
B5
A5
GND
20
Figure 21. MAX245 Pin Configuration and Typical Operating Circuit
30 ______________________________________________________________________________________
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
