Transceivers with ±15kV ESD Protection

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19

Applications Information

Typical Applications

The MAX3535E/MXL1535E transceivers facilitate bi-

directional data communications on multipoint bus

transmission lines. Figure 11 shows a typical RS-485

multidrop-network applications circuit. Figure 12 shows

the MAX3535E/MXL1535E functioning as line repeaters

with cable lengths longer than 4000ft. To minimize

reflections, terminate the line at both ends in its charac-

teristic impedance. Keep stub lengths off the main line

as short as possible.

DI

DE

RO

TGM-240

1/2

BAT54C

TRANSFORMER

DRIVER

BARRIER

TRANSCEIVER

ISOLATION BARRIER

BARRIER

TRANSCEIVER

1/2

BAT54C

VOLTAGE

REGULATOR

B

A

R

D

RE

RO

DE

DI

R

120

Ω

D

A

B

RE

RE

DI

DE

RO

B

A

R

D

GND2

+3.3V

DRIVER

RECEIVER

A

B

Y

Z

SLO

RO2

ST1

RO1

RE

DE

DI

GND1

ST2

120

Ω

0.1

µF

0.1

µF

CONTROL GROUND

RS-485 GROUND

10

µF

10

µF

MAX3535E

R

D

Figure 11. Typical Half-Duplex Multidrop RS-485 Network