MAX239 Maxim Integrated Products, MAX239 Datasheet - Page 32

• Manufacturer Part Number: MAX239
• Description: (MAX220 - MAX249) +5V-Powered / Multichannel RS-232 Drivers/Receivers
• Manufacturer: Maxim Integrated Products

+5V-Powered, Multichannel RS-232
Drivers/Receivers
Figure 23. MAX247 Pin Configuration and Typical Operating Circuit
32
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TOP VIEW
MAX247 FUNCTIONAL DESCRIPTION
9 RECEIVERS
8 TRANSMITTERS
4 CONTROL PINS
4 A-SIDE RECEIVERS
5 B-SIDE RECEIVERS (R B5 ALWAYS ACTIVE)
4 A-SIDE TRANSMITTERS
4 B-SIDE TRANSMITTERS
ENABLE RECEIVER A-SIDE (ENRA)
ENABLE RECEIVER B-SIDE (ENRB)
ENABLE RECEIVER A-SIDE (ENTA)
ENABLE RECEIVERr B-SIDE (ENTB)
R
R
R
R
R
T
T
T
T
B5
A4
A3
A2
A1
A1
A2
A3
A4
R
R
R
R
ENTA
T
T
T
ENRA
T
GND
OUT
A1
A2
A3
OUT
OUT
OUT
OUT
A1
A2
A3
A4
OUT
OUT
OUT
OUT
A4
IN
IN
IN
IN
IN
IN
IN
IN
10
11
12
13
14
15
16
17
18
19
20
1
2
3
4
5
6
7
8
9
MAX247
DIP
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
V
ENTB
T
T
T
T
R
R
R
R
ENRB
R
R
R
R
R
T
T
T
T
B1
B2
B3
B4
B1
B2
B3
B4
CC
B4
B3
B2
B1
B1
B2
B3
B4
B5
IN
IN
IN
IN
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
IN
IN
IN
IN
IN
16
17
18
19
12 R
10 R
13 R
14 R
15 R
11
1
2
3
4
5
6 R
9 R
8 R
7
ENTA
T
T
T
T
T
T
T
T
R
ENRA
A1
A1
A2
A2
A3
A3
A4
A4
B5
A1
A1
A2
A2
A3
A3
A4
A4
OUT
IN
OUT
IN
OUT
IN
OUT
IN
OUT
IN
OUT
IN
OUT
IN
OUT
IN
OUT
5kΩ
5kΩ
5kΩ
5kΩ
1µF
+5V
+5V
+5V
+5V
400kΩ
400kΩ
400kΩ
400kΩ
GND
V
+5V
CC
20
40
+5V
+5V
+5V
+5V
5kΩ
5kΩ
5kΩ
5kΩ
5kΩ
R
R
R
R
T
T
T
T
B1
B2
B3
B4
B1
B2
B3
B4
R
R
R
R
R
ENTB
T
T
T
T
ENRB
OUT
B1
OUT
B2
OUT
B3
OUT
B4
B5
B1
OUT
B2
OUT
B3
OUT
B4
OUT
IN
IN
IN
IN
IN
IN
IN
IN
IN
39
24
38
23
37
22
36
21
35
25
29
31
28
32
27
33
26
34
30