MAX231 Maxim, MAX231 Datasheet - Page 34

• Manufacturer Part Number: MAX231
• Description: +5V-Powered / Multichannel RS-232 Drivers/Receivers
• Manufacturer: Maxim

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+5V-Powered, Multichannel RS-232
Drivers/Receivers
Figure 25. MAX249 Pin Configuration and Typical Operating Circuit
34
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R
R
R
R
R
A1
A2
A3
A4
A5
R
R
ENRA
T
T
T
A2
A1
OUT
OUT
OUT
OUT
OUT
A1
A2
A3
TOP VIEW
IN
IN
IN
IN
IN
10
11
12
13
14
15
16
17
7
8
9
MAX249 FUNCTIONAL DESCRIPTION
10 RECEIVERS
6 TRANSMITTERS
4 CONTROL PINS
5 A-SIDE RECEIVERS
5 B-SIDE RECEIVERS
3 A-SIDE TRANSMITTERS
3 B-SIDE TRANSMITTERS
ENABLE RECEIVER A-SIDE (ENRA)
ENABLE RECEIVER B-SIDE (ENRB)
ENABLE RECEIVER A-SIDE (ENTA)
ENABLE RECEIVER B-SIDE (ENTB)
18
6
19 20
5
4
21
3
22 23
2
MAX249
PLCC
1
44
24
43
25
42
26
41
27 28
40
39
38
37
36
35
34
33
32
31
30
29
R
R
R
ENRB
R
R
R
R
R
T
T
B3
B2
B1
B1
B2
B3
B4
B5
B1
B2
IN
IN
IN
IN
IN
OUT
OUT
OUT
OUT
OUT
1µF
1µF
21
23
24
25
18
15
16
17
10 R
11 R
12 R
13 R
14
1
2
3
8 R
7 R
6 R
5 R
4 R
9
C1+
C1-
C2+
C2-
ENTA
T
T
T
T
T
T
R
ENRA
A1
A1
A2
A2
A3
A3
A1
A1
A2
A2
A3
A3
A4
A4
A5
A5
OUT
IN
OUT
IN
OUT
IN
IN
OUT
IN
OUT
IN
OUT
IN
OUT
IN
OUT
5kΩ
5kΩ
5kΩ
5kΩ
5kΩ
+10V TO -10V VOLTAGE INVERTER
1µF
+5V TO +10V VOLTAGE DOUBLER
+5V
+5V
+5V
20
400kΩ
400kΩ
400kΩ
GND
V
+5V
CC
19
+5V
+5V
+5V
1µF
5kΩ
5kΩ
5kΩ
5kΩ
5kΩ
T
T
T
R
R
R
R
R
B1
B2
B3
B1
B2
B3
B4
B5
R
R
R
R
R
T
T
T
ENRB
ENTB
OUT
B1
OUT
B2
OUT
B3
B1
OUT
B2
OUT
B3
OUT
B4
OUT
B5
OUT
V+
V-
IN
IN
IN
IN
IN
IN
IN
IN
22
26
27
44
30
43
29
42
28
37
35
38
34
39
33
40
32
41
31
36
1µF