MAX253(2010) Ver la hoja de datos (PDF) - Maxim Integrated
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MAX253 Datasheet PDF : 18 Pages
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Transformer Driver for
Isolated RS-485 Interface
VIN
3.3V
C1
0.1µF
5
N.C.
1
D1
ON / OFF
4 SD MAX253
6
VCC
8
D2
3
FS
GND1 GND2
2
7
1N5817
ISOLATION
BARRIER
1CT:2.1CT** 1N5817
C3
0.1µF
1N5817
1N5817
*74HC04
DI
C5
0.1µF
PC410 / 417
6
390Ω
1
5
*74HC04
DE
390Ω
3
4
PC357T
1
4
*74HC04
RO
3.3kΩ
*74HC04 OR EQUIVALENT
** SEE TABLE 2
2
3
PC410 / 417
6
5
1
4
3
8 IN
C2
22µF
MAX667
OUT 2
ISO 5V
C4
22µF
SET GND SHDN
6
4
5
3.3kΩ
3.3kΩ
390Ω
8
4 DI
VCC
6
A
MAX481
3 DE MAX483
485
MAX485
I/O
MAX487
1 RO
RE
7
B
GND
2
5
Figure 4. Typical RS-485 Application Circuit, 3.3V Configuration
8 _______________________________________________________________________________________
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