LTC2871_15 Datasheet, PDF(17/42 Page) Linear Technology – RS232/RS485 Multiprotocol Transceivers with Integrated Termination

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LTC2871_15 Datasheet, PDF (17/42 Pages) Linear Technology – RS232/RS485 Multiprotocol Transceivers with Integrated Termination

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test circuits

LTC2870/LTC2871

RECEIVER

INPUT

RECEIVER

OUTPUT

RECEIVER

INPUT

RECEIVER

OUTPUT

1.5V

tPHLR232

90%

10%

Â½VL

tFR232

+3V

1.5V

tPLHR232

â3V

90%

Â½VL 10%

tRR232

tSKEWR232 = |tPLHR232 â tPHLR232|

28701 F11

Figure 11. RS232 Receiver Timing Measurements

â3V OR +3V

RECEIVER

OUTPUT RL

RXEN/RX232

GND

OR VL

RXEN/

RX232

RECEIVER

OUTPUT

RECEIVER

OUTPUT

Â½VL

tZHR232

Â½VL

tZLR232

Â½VL

Figure 12. RS232 Receiver Enable and Disable Times

Â½VL

tHZR232

0.5V

tLZR232

0.5V

VOHR

VOLR

28701 F12

For more information www.linear.com/LTC2870

28701fa

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