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Half-duplex transceiver targets remote apps

Posted: 22 Jan 2008     Print Version  Bookmark and Share

Keywords:transceiver  receiver  remote applications 

Exar Corp.'s half duplex transceiver targets remote applications including e-metering monitoring, building automation, heating, ventilating, and air conditioning controls, security camera systems and applications on long, or unterminated transmission lines. The SP4082E, a highly integrated 5V RS-485/RS-422 half duplex is designed for reliable, bidirectional communication on multipoint bus transmission lines and contains one differential driver and one differential receiver. It supports the entire common-mode voltage range from -7V to +12V.

Receivers are specially designed to fail-safe to a logic high output state if the inputs are left un-driven or shorted. In addition, all receivers have exceptionally high input impedance, which places only 1/8th the standard load on a shared bus. All RS-485 bus-pins are protected against severe ESD events up to ±15kV (Human Body Model).

The device operates from a single 5.0V power supply and draws negligible quiescent power. The device can independently enable and disable the driver and receiver and enter a low power shutdown mode if both driver and receiver are disabled. All outputs maintain high impedance in shutdown or when powered-off.

The devices cost Rs.19.34 ($0.49) each in 1,000-piece quantities. Samples are available.

- Ismini Scouras

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