GENERAL DESCRIPTION
The ADM3493 is a low power, differential line transceiver designed to operate using a single 3.3 V power supply. Low power consumption, coupled with a shutdown mode, makes it ideal for power-sensitive applications. The ADM3493 is suitable for communication on multipoint bus transmission lines.
The device contains one driver and one receiver. Designed for half-duplex communication, the ADM3493 features a slew rate limited driver that minimizes EMI and reduces reflections caused by improperly terminated cables, allowing error-free data transmission at data rates up to 250 kbps.
The receiver input impedance is 96 kΩ, allowing up to 256 transceivers to be connected on the bus. A thermal shutdown circuit prevents excessive power dissipation caused by bus contention or by output shorting. If a significant temperature increase is detected in the internal driver circuitry during fault conditions then the thermal shutdown circuit forces the driver output into a high impedance state. The receiver contains a fail safe feature that results in a logic high output state, if the inputs are unconnected (floating).
The ADM3493 is fully specified over the commercial and industrial temperature ranges and is available in an 8-lead SOIC.

FEATURES
  Operates with 3.3 V supply
  Interoperable with 5 V logic
  EIA RS-422 and RS-485 compliant over full CM range
  Data rate: 250 kbps
  Half duplex transceiver
  Reduced slew rates for low EMI
  2 nA supply current in shutdown mode
  Up to 256 transceivers on a bus
  −7 V to +12 V bus common-mode range
  Specified over −40°C to +85°C temperature range
  8 ns skew
  Available in 8-lead SOIC

APPLICATIONS
  Low power RS-485 applications
  EMI sensitive systems
  DTE-DCE interfaces
  Industrial control
  Packet switching
  Local area networks
  Level translators