MAX239 Maxim Integrated Products, MAX239 Datasheet - Page 30

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