MAX253C/D(2009) 查看數據表（PDF） - Maxim Integrated
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MAX253C/D Datasheet PDF : 17 Pages
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Transformer Driver for
Isolated RS-485 Interface
VIN
5V
C1
0.1µF
6
VCC
1
D1
ON / OFF
4 SD MAX253
GND1 GND2
2
7
8
D2
3
FS
ISOLATION
BARRIER
ICT:1.3CT** 1N5817
C3
0.1µF
1N5817
8 IN
C2
22µF
MAX667
OUT 2
ISO 5V
C4
22µF
SET GND SHDN
6
4
5
*74HC04
DI
390Ω
*74HC04
DE
390Ω
*74HC04
RO
3.3kΩ
*74HC04 OR EQUIVALENT
** SEE TABLE 2
PC410 / 417
6
1
5
3
4
PC357T
1
4
2
3
PC410 / 417
6
5
1
4
3
3.3kΩ
390Ω
3.3kΩ
8
4 DI
VCC
6
A
MAX481
3 DE MAX483
485
MAX485
I/O
MAX487
1 RO
RE
7
B
GND
2
5
Figure 3. Typical RS-485 Application Circuit, 5V Configuration
6 _______________________________________________________________________________________
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