Rugged RS485/RS422 Transceivers Operate up to 20MBps or 250kbps for Low EMI

Aug 29 2006 - MILPITAS, CA
  • Linear Technology Corporation introduces the LTC2856/LTC2857/LTC2858 low power RS485/422 transceivers, operating on 5V supplies. The LTC2856-1, LTC2857-1 and LTC2858-1 operate at maximum data rates of 20MBps, while the LTC2856-2, LTC2857-2 and LTC2858-2 feature 250kbps slew rate limited driver outputs to control high frequency emission from equipment and data cables. Enhanced ESD protection on the transceiver interface pins allows the ICs to withstand ±15kV for ESD strikes (Human Body Model) without latchup or damage. The receiver fail-safe feature further enhances the devices' operation by guaranteeing a high output state under conditions of floating or shorted inputs.

    The receivers of the LTC2856/LTC2857/LTC2858 hves a one-eighth unit load, supporting up to 256 devices on the bus, while the drivers of all ICs maintain a high output impedance over the entire common mode range when disabled or when the supply is removed. Excessive power dissipation caused by bus contention or a fault is prevented by current limiting all outputs and by thermal shutdown.

    The rich combination of features makes the LTC2856/LTC2857/LTC2858 an ideal fit across various applications in the consumer, industrial, medical and automotive markets. The ICs are offered in 8-pin and 10-pin MSOP and 3mm × 3mm DFN packages. Specified over the commercial and industrial temperature ranges and available from stock, pricing for the LTC2856/LTC2857/LTC2858 begins at $1.45 each in 1000-piece quantities.

    Summary of Features: LTC2856

    • 20MBps or Low EMI 250kbps Maximum Data Rate
    • No Damage or Latchup to ESD: ±15kV
    • High Input Impedance Supports 256 Nodes
    • Guaranteed Failsafe Receiver Operation Over the Entire Common Mode Range
    • Current Limited Drivers and Thermal Shutdown
    • Delayed Micropower Shutdown: 5uA Max
    • Compatible with TIA/EAI-485-A Specification
    • Available in 8-Lead and 10-Lead 3mm × 3mm DFN and MSOP Packages

    20Mbps and Slew Porte Limited 15kV RS485 Transceivers


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