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Design Notes

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  Interfacing to Apple LocalTalk В® Networks &mdash DN85
  PDF, 131 Кб, Файл опубликован: 15 сен 1994
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  advertisement Interfacing to Apple LocalTalk В® Networks
  Design Note 85
  Robert Reay
  external –5V supply. The bipolar chips also draw large
  supply currents, making them undesirable for batterypowered applications. A better solution is to use the
  LTC1323CS24 which provides a complete low power
  serial I/O interface while generating it’s own –5V supply
  as shown in Figure 1. LocalTalk Overview
  Of the many connection technologies available for linking an AppleTalk В® network, LocalTalk is one of the most
  common because it is designed to connect local work
  groups using inexpensive and easily configurable plugand-play cabling. LocalTalk is laid out in a bus topology
  with all devices joined in a line with no circular connections. LocalTalk conforms to the EIA RS422 electrical
  standard to provide a balanced differential voltage signal transmitting at 230.4kbs over a maximum distance
  of 300 meters with up to 32 devices connected to a
  twisted-pair network. The balanced configuration provides good isolation from ground noise currents and is
  not susceptible to fluctuating potentials between system grounds or common-mode electromagnetic interference (EMI). The LTC1323 uses the differential driver output stage of
  Figure 2. The driver swings between ground and VCC
  when a differential LocalTalk load is connected between
  TXD + and TXD – while meeting the EIA RS422 differential voltage swing requirement of ±2.0V into 100Ω.
  When a single-ended load is connected from TXD + to
  ground or TXD – to ground, the driver will swing between VEE and VCC while meeting the EIA 562 voltage
  swing requirement of ±3.7V into 3kΩ. Because the
  differential LocalTalk load requires a large current drive, …

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• Interface > Multiprotocol Transceivers