MAX253(2009) View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
MAX253 Datasheet PDF : 17 Pages
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Transformer Driver for
Isolated RS-485 Interface
VIN
5V
C1
6
0.1µF 5 N.C. VCC D1 1
ON / OFF
4
MAX253
SD
D2 8
3
FS
GND1 GND2
2
7
ISOLATION
BARRIER
ICT:1.3CT**1N5817
C3
0.1µF
1N5817
8 IN
OUT 2
C2
22µF MAX667
ISO 5V
C4
22µF
5 x 3.3kΩ
SET GND SHDN
6 45
*74HC04
T1IN
74HC04
T2IN
74HC04
T3IN
74HC04
T4IN
74HC04
T5IN
390Ω
390Ω
390Ω
390Ω
390Ω
10 x PC417
1
6
5
2
4
8
VCC
T1IN
GND
T1OUT 3
7 T2IN
T2OUT 4
15 T3IN
T3OUT 2
16 T4IN
T4OUT 1
22 T5IN
T5OUT 19
5 X 3.3kΩ
MAX205
74HC04
R1OUT
74HC04
R2OUT
6
1
5
4
2
390Ω
390Ω
9 R1OUT
R1IN 10
6 R2OUT
R2IN 5
74HC04
R3OUT
74HC04
R4OUT
390Ω
390Ω
23 R3OUT
R3IN 24
17 R4OUT
R4IN 18
74HC04
R5OUT
*74HC04 OR EQUIVALENT
** SEE TABLE 2
390Ω
14 R5OUT
SD
21
R5IN 13
EN
20
4N25 LOWER SPEED, LOWER COST ALTERNATE OPTOCOUPLER CONFIGURATIONS (FOR DATA RATES BELOW 9.6kbps)
390Ω
TIN
*74HC04
4N25 6 1N5711
1
5
3.3kΩ
VCC
1N5711
3.3kΩ
ISO ROUT
TIN
74HCO4
5
6 4N25
1
390Ω
VCC
ISO
ROUT
2
ISO
2 ISO
4 GND
4
GND
Figure 5. Typical RS-232 Application Circuit
8 _______________________________________________________________________________________
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