Datasheet

MAX253
Transformer Driver for
Isolated RS-485 Interface
Maxim Integrated | 11www.maximintegrated.com
C3
0.1μF
C1
0.1μF
C2
22μF
5V @ 200mA
ISO OUTPUT
5V
V
IN
L2
25μH
MAX253
D1
D2FS
GND1 GND2
V
CC
1
8
6
27
3
FREQUENCY
SWITCH
SD
4
C7
2.2μF
FILTER
OUTPUT
OUTPUT
OPTIONAL 21kHz LOWPASS OUTPUT FILTER
TP1
1N5817
1CT:1.3CT*
1N5817
ON / OFF
*SEE TABLE 2
Figure 6. 5V to Isolated 5V Application Circuit
C3
0.1μF
C1
0.1μF
C2
22μF
5V @ 100mA
ISO OUTPUT
3.3V
V
IN
L2
25μH
MAX253
D1
D2FS
GND1 GND2
V
CC
1
8
627
3
FREQUENCY
SWITCH
SD
4
C7
2.2μF
FILTER
OUTPUT
OUTPUT
OPTIONAL 21kHz LOWPASS OUTPUT FILTER
TP1
1N5817
1CT:2.1CT*
1N5817
ON / OFF
1N5817
1N5817
C4
0.1μF
*SEE TABLE 2
Figure 7. 3.3V to Isolated 5V Application Circuit