MAX483MAX487 datasheet(9/18 Pages) MAXIM

Part #	MAX483MAX487

Description	MAX253 Transformer Driver for Isolated RS-485 Interface

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Manufacturer	MAXIM [Maxim Integrated Products]

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Transformer Driver for

Isolated RS-485 Interface

C3

0.1µF

C2

22µF

ISO 5V

ISOLATION

BARRIER

5V

VIN

1

8

5

C1

0.1µF

1N5817

MAX253

D1

D2

GND1 GND2

VCC

6

27

N.C.

SD

4

ON / OFF

10 x PC417

*74HC04 OR EQUIVALENT

** SEE TABLE 2

MAX205

EN

SD

C4

22µF

82

1N5817

MAX667

5

64

SHDN

SET

GND

IN

OUT

390

Ω

83

T1IN

T1OUT

390

Ω

*74HC04

T1IN

1

2

4

5

6

1

2

4

5

6

390

Ω

74HC04

T2IN

390

Ω

74HC04

T3IN

390

Ω

74HC04

T4IN

390

Ω

74HC04

T5IN

74HC04

R1OUT

74HC04

R2OUT

R3OUT

R4OUT

R5OUT

5 X 3.3k

Ω

390

Ω

390

Ω

390

Ω

390

Ω

74

T2IN

T2OUT

15

2

T3IN

T3OUT

16

1

T4IN

T4OUT

22

19

T5IN

T5OUT

910

R1OUT

R1IN

65

R2OUT

R2IN

23

24

R3OUT

R3IN

17

18

R4OUT

R4IN

14

13

R5OUT

R5IN

VCC

20

21

GND

5 x 3.3k

Ω

1N5711

6

5

4

1

2

390

Ω

3.3k

Ω

VCC

ISO

ROUT

1N5711

1

2

6

5

4

390

Ω

3.3k

Ω

VCC

ISO

TIN

*74HC04

4N25 LOWER SPEED, LOWER COST ALTERNATE OPTOCOUPLER CONFIGURATIONS (FOR DATA RATES BELOW 9.6kbps)

FS

3

74HCO4

4N25

ISO

GND

4N25

ISO

GND

1CT:1.3CT**

Figure 5. Typical RS-232 Application Circuit

MAX253

Maxim Integrated

9

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