MAX253 View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
MAX253 Datasheet PDF : 18 Pages
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MAX253
Transformer Driver for
Isolated RS-485 Interface
VIN
5V
C1
0.1μF
6
4
SD
ON / OFF
VCC
1
D1
MAX253
3
FREQUENCY
SWITCH
FS
GND1
2
8
D2
GND2
7
*SEE TABLE 2
1CT:1.3CT* 1N5817
C3
0.1μF
5V @ 200mA
TP1 ISO OUTPUT
C2
22μF
1N5817
OPTIONAL 21kHz LOWPASS OUTPUT FILTER
L2
25μH
FILTER
OUTPUT
OUTPUT
C7
2.2μF
Figure 6. 5V to Isolated 5V Application Circuit
VIN
3.3V
C1
0.1μF
4
SD
ON / OFF
MAX253
1
D1
1CT:2.1CT* 1N5817
C3
0.1μF
5V @ 100mA
TP1 ISO OUTPUT
C2
22μF
3
FREQUENCY
SWITCH
FS
GND1 GND2
2
7
8
D2
VCC
6
1N5817
1N5817
1N5817
*SEE TABLE 2
C4
0.1μF
OPTIONAL 21kHz LOWPASS OUTPUT FILTER
L2
25μH
FILTER
OUTPUT
OUTPUT
C7
2.2μF
Figure 7. 3.3V to Isolated 5V Application Circuit
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