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LTC2859 - 20Mbps RS485 Transceiver with Integrated Switchable Termination

The LTC2859 and LTC2861 are low power, 20Mbps RS485/422 transceivers operating on 5V supplies. The receiver includes a logic-selectable 120Ω termination, one-eighth unit load supporting up to 256 nodes per bus, and a failsafe feature that guarantees a high output state under conditions of floating or shorted inputs.

The driver features a logic-selectable low-EMI 250kbps operating mode, and maintains 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 a thermal shutdown.

Enhanced ESD protection allows the LTC2859 and LTC2861 to withstand ±15kV (human body model) on the transceiver interface pins without latchup or damage.

Features Integrated, Logic-Selectable 120Ω Termination Resistor 20Mbps Max Data Rate No Damage or Latchup to ESD: ±15kV HBM High Input Impedance Supports 256 Nodes 250kbps Low-EMI Mode Guaranteed Failsafe Receiver Operation Over the Entire Common Mode Range Current Limited Drivers and Thermal Shutdown Delayed Micropower Shutdown (5μA Max) Power Up/Down Glitch-Free Driver Outputs Low Operating Current (900μA Max in Receive Mode) Meets All TIA/EIA-485-A Specifi cations Available in 10-Pin 3mm × 3mm DFN, 12-Pin 4mm × 3mm DFN and 16-Pin SSOP Packages Typical Application

Applications Low Power RS485/RS422 Transceiver Level Translator Backplane Transceiver Packaging