11

SP503_101_101508

SP503 Multiprotocol Transceiver

© Copyright 2008 Exar Corporation

SP503

+

22µF, 16V

+5V, ±5%

+

22µF

16V

25

27

26

30

28

31

32

22µF

16V

+

+

22µF, 16V

GND

Charge

Pump

V.35 External

Driver Output

Termination Resistors

together. Charge pump capacitors must

be placed as close to the package as

possible.

107

Ω

-5V

232

Ω

232

Ω

107

Ω

-5V

232

Ω

232

Ω

120

Ω

50

Ω

50

Ω

120

Ω

50

Ω

50

Ω

V.35 External

Receiver Input

Termination Resistors

Receiver

Decode

Driver

Decode

Ext.

Latch

1

1

1

0

1

1

1

0

Note: An external voltage of -5V, ±5% is needed for the driver output termination resistors.

These V.35 termination resistors comply with all the parameters specified in CCITT

Recommendation V.35. For other termination configurations, please consult factory.

IN5819

200

Ω

200

Ω

200

Ω

200

Ω

107

Ω

-5V

232

Ω

232

Ω

200

Ω

200

Ω

120

Ω

50

Ω

50

Ω

+

Figure 6. Typical Operating Circuit