GENERAL DESCRIPTION
The ADM485E/ADM487E/ADM1487E are 5 V, low power data transceivers with ±15 kV ESD protection suitable for half duplex communication on multipoint bus transmission lines. They are designed for balanced data transmission and comply with Telecommunication Industry Association/Electronics Industries Association (TIA/EIA) standards RS-485 and RS-422. The ADM487E and ADM1487E have a 1/4 unit load receiver input impedance that allows up to 128 transceivers on a bus, whereas the ADM485E allows up to 32 transceivers on a bus. Because only one driver is enabled at any time, the output of a disabled or power-down driver is three-stated to avoid overloading the bus.

FEATURES
  TIA/EIA RS-485/RS-422 compliant
  ESD protection on RS-485 I/O pins
  ±15 kV human body model (HBM)
  Data rates
     ADM487E: 250 kbps
     ADM485E/ADM1487E: 2.5 Mbps
  Half-duplex
  Reduced slew rates for low EMI
  Common-mode input range: −7 V to +12 V
  Thermal shutdown and short-circuit protection
  8-lead SOIC packages
  ADM487EW qualified for automotive applications

APPLICATIONS
  Energy/power metering
  Lighting systems
  Industrial control
  Telecommunications
  Security systems
  Instrumentation