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Design Notes

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  New Developments in RS232 Interfaces &mdash DN4
  PDF, 73 Кб, Файл опубликован: 1 ноя 1987
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  New Developments in RS232 Interfaces
  Design Note 4
  Robert Dobkin
  New RS232 interface chips have been developed that
  offer significant advantages over older devices such
  as the 1488 and 1489. The new RS232 interface ICs
  improve speed, power, voltage supply requirements, and
  protection over older devices. Further, the new chips
  are easier to use, requiring fewer external components
  and may be turned off to a “zero” power supply current
  condition for use in battery powered systems.
  The new RS232 drivers are implemented in a monolithic
  bipolar technology. A unique output stage was designed
  that provides large output swings, minimizing power
  supply voltage requirements, while retaining outstanding overload protection features. The outputs can be
  driven beyond the power supply voltage without drawing excessive current or forcing current back into the
  power supplies. Of course, current limiting is included
  to protect against short circuit conditions.
  Initial consideration of technologies for implementing
  RS232 interfacing might include CMOS as a possible
  technology for this type of application. Power supply
  requirements are low, output voltage swing is high,
  and higher voltage CMOS technologies are available …

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• Interface > RS232/RS562 Transceivers