Datasheet Linear Technology LTC1685 — Даташит

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Design Notes

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  RS485 Transceivers Operate at 52Mbps Over 100 Feet of Unshielded Twisted Pair &mdash DN168
  PDF, 89 Кб, Файл опубликован: 1 ноя 1997
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  RS485 Transceivers Operate at 52Mbps Over 100 Feet of
  Unshielded Twisted Pair – Design Note 168
  Victor Fleury
  The propagation delay of typical RS485 transceivers can vary by as much as 500% over process and
  temperature. In applications where high speed clock
  and data waveforms are sent over long distances,
  propagation delay and skew uncertainties can pose
  system design constraints and limit the maximum
  data rate. The LTC В®1685 high speed RS485 transceiver
  family addresses this problem by guaranteeing over
  temperature a precision propagation delay of 18.5ns
  В±3.5ns, a better than ten times improvement over other
  CMOS transceivers.
  The LTC1685 is geared for half-duplex operation,
  whereas the LTC1686/LTC1687 can operate in fullduplex mode. All include a receiver fail-safe feature,
  whereby the receiver output remains in a high state
  over the entire 12V to –7V common mode range when
  the inputs are left open or shorted together. A novel
  protection technique permits indefinite short circuiting
  of the driver and receiver outputs to supply or ground,
  while limiting the current to 20mA.
  HIGH SPEED DIFFERENTIAL SCSI
  (FAST-20/FAST-40 HVD) …

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• Interface > RS485/RS422 Transceivers