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LTC2873 Fiches technique(PDF) 22 Page - Analog Devices

No de pièce LTC2873
Description  Single-Bus RS485/RS232 Multiprotocol Transceiver with Switchable Termination
Download  32 Pages
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
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LTC2873 Fiches technique(HTML) 22 Page - Analog Devices

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LTC2873
22
REV B
For more information www.analog.com
APPLICATIONS INFORMATION
Logic Loopback
Aloopbackmodeconnectsthedriverinputstothereceiver
outputs(non-inverting)providinganechoforself-test.This
applies to both RS232 and RS485 transceivers. Loopback
mode is entered when the LB pin is set to a logic-high and
the relevant receiver is enabled. The RS485 driver output
can be disabled in loopback mode if DE485/F232 is held
low, or functions normally with DE485/F232 high. The
RS232 driver output cannot be disabled when loopback
is engaged in RS232 mode, and functions normally. The
loopback signal traverses a path from the logic input cir-
cuit at DI to the logic output at RO and does not exercise
the entire driver or receiver circuit. Thus loopback, alone,
is not a sufficient test to ensure full functionality of the
LTC2873. Loopback does not affect the operation of the
termination resistors.
Robust ESD Protection
TheLTC2873featuresexceptionallyrobustESDprotection.
The transceiver interface pins (A and B) are protected to
±26kV human body model with respect to GND, VCC, or VL
without latchup or damage. This protection holds whether
the device is unpowered or powered in any mode of opera-
tion. To note, ±26kV is an upper limit of the tester—the
actual device protection level is higher. Every other pin on
the device is protected to ±4kV ESD (HBM) for all-around
robustness. Figure 22 shows the LTC2873 being struck
repeatedly with 26kV of ESD energy (air gap discharge)
during operation with no damage or circuit latchup.
RS485 Cable Length vs Data Rate
Many factors contribute to the maximum cable length
that can be used for RS485 or RS422 communication,
including driver transition times, receiver threshold, duty
Figure 22. LTC2873 Struck Repeatedly with 26kV of ESD Energy While Operating. No Damage or Circuit Latchup Occurs


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