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
   Data rates
      ADM487E: 250 kbps
      ADM485E/ADM1487E: 2.5 Mbps
   Half-duplex options
   Reduced slew rates for low EMI
   −7 V to +12 V common-mode input range
   Thermal shutdown and short-circuit protection
   8-lead SOIC packages

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