+5V-Powered, Multichannel RS-232
Drivers/Receivers
+5V
TOP VIEW
1µF
40
V
CC
ENA
1
2
3
4
5
6
7
8
9
40
V
CC
+5V
400kΩ
+5V +5V
400kΩ
+5V +5V
400kΩ
+5V +5V
+5V
T
T
T
T
T
T
T
T
OUT
IN
T
T
T
T
OUT 24
16
2
A1
A1
A2
A2
A3
A3
A4
A4
B1
T
T
T
T
IN
IN
IN
39 ENB
A1
A2
A3
38
37
36
35
34
33
32
31
T
T
T
T
IN
IN
IN
IN
B1
B2
B3
B4
IN 38
B1
17
3
OUT
IN
OUT 23
B2
T
T
IN
A4
R
OUT
OUT
OUT
OUT
A5
IN 37
B2
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
MAX246
18
4
OUT
IN
OUT 22
B3
T
IN 36
B3
OUT 10
OUT
OUT 21
19
IN 11
A1
30
29
28
27
26
25
24
23
22
21
B4
T
B1
B1
B2
B3
B4
B5
400kΩ
R
IN 12
IN 13
IN 14
IN 15
A2
A3
A4
A5
IN
IN
5
1
35
39
B4
R
IN
ENA
ENB
R
IN
11
R
IN
R
IN 29
B1
A1
R
IN
T
T
T
T
OUT 16
OUT 17
OUT 18
OUT 19
IN
A1
A2
A3
A4
5kΩ
5kΩ
T
T
T
T
OUT
OUT
OUT
OUT
B1
B2
B3
B4
10
12
R
R
OUT
IN
R
OUT 30
A1
A2
B1
R
IN 28
B2
5kΩ
5kΩ
GND 20
9
R
R
OUT
IN
R
OUT 31
A2
A3
B2
R
DIP
13
IN 27
B3
5kΩ
5kΩ
MAX246 FUNCTIONAL DESCRIPTION
10 RECEIVERS
8
R
R
OUT
IN
R
OUT 32
A3
A4
B3
R
5 A-SIDE RECEIVERS (R ALWAYS ACTIVE)
A5
5 B-SIDE RECEIVERS (R ALWAYS ACTIVE)
B5
14
IN 26
B4
8 TRANSMITTERS
5kΩ
5kΩ
4 A-SIDE TRANSMITTERS
4 B-SIDE TRANSMITTERS
2 CONTROL PINS
7
R
R
OUT
IN
R
OUT 33
A4
A5
B4
R
15
IN 25
B5
ENABLE A-SIDE (ENA)
ENABLE B-SIDE (ENB)
5kΩ
OUT
5kΩ
6
R
R OUT 34
B5
A5
GND
20
Figure 22. MAX246 Pin Configuration and Typical Operating Circuit
______________________________________________________________________________________ 31
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
