MAX231 Maxim, MAX231 Datasheet - Page 33

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

Figure 24. MAX248 Pin Configuration and Typical Operating Circuit
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R
R
R
R
A1
A2
A3
A4
R
R
ENRA
T
T
T
T
A2
A1
OUT
OUT
OUT
OUT
A1
A2
A3
A4
TOP VIEW
IN
IN
IN
IN
IN
IN
10
11
12
13
14
15
16
17
MAX248 FUNCTIONAL DESCRIPTION
8 RECEIVERS
8 TRANSMITTERS
4 CONTROL PINS
7
8
9
4 A-SIDE RECEIVERS
4 B-SIDE RECEIVERS
4 A-SIDE TRANSMITTERS
4 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
MAX248
PLCC
1
+5V-Powered, Multichannel RS-232
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
T
T
T
B1
B2
B3
B3
B2
B1
B1
B2
B3
B4
IN
IN
IN
IN
IN
IN
OUT
OUT
OUT
OUT
1µF
1µF
21
23
24
25
18
14
15
16
17
10 R
11 R
12 R
13
1
2
3
4
8 R
7 R
6 R
5 R
9
C1+
C1-
C2+
C2-
ENTA
T
T
T
T
T
T
T
T
R
ENRA
A1
A1
A2
A2
A3
A3
A4
A4
A1
A1
A2
A2
A3
A3
A4
A4
OUT
IN
OUT
IN
OUT
IN
OUT
IN
IN
OUT
IN
OUT
IN
OUT
IN
OUT
5kΩ
5kΩ
5kΩ
5kΩ
Drivers/Receivers
+10V TO -10V VOLTAGE INVERTER
1µF
+5V TO +10V VOLTAGE DOUBLER
+5V
+5V
+5V
+5V
20
400kΩ
400kΩ
400kΩ
400kΩ
GND
+5V
V
CC
19
+5V
+5V
+5V
+5V
5kΩ
5kΩ
5kΩ
5kΩ
1µF
T
T
T
T
R
R
R
R
B1
B2
B3
B4
B1
B2
B3
B4
T
T
T
T
R
R
R
R
ENTB
ENRB
OUT
B1
OUT
B2
OUT
B3
OUT
B4
B1
OUT
B2
OUT
B3
OUT
B4
OUT
V+
V-
IN
IN
IN
IN
IN
IN
IN
IN
22
26
27
44
31
43
30
42
29
41
28
37
35
38
34
39
33
40
32
36
1µF
33