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LTC2855 - 3.3V 20Mbps RS485/RS422 Transceiver with Integrated Switchable Termination

The LTC®2854 and LTC2855 are low power, 20Mbps RS485/RS422 transceivers operating on 3.3V supplies. The receiver includes a logic-selectable 120Ω termination, one-eighth unit load supporting up to 256 nodes per bus (C-, I-Grade), and a failsafe feature that guarantees a high output state under conditions of floating or shorted inputs.

The driver 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 LTC2854 to withstand ±25kV (human body model) and the LTC2855 to withstand ±15kV on the transceiver interface pins without latchup or damage.

Features Integrated, Logic-Selectable 120Ω Termination Resistor 3.3V Supply Voltage 20Mbps Maximum Data Rate No Damage or Latchup Up to ±25kV HBM High Input Impedance Supports 256 Nodes (C-, I‑Grade) Operation Up to 125°C (H-Grade) Guaranteed Failsafe Receiver Operation Over the Entire Common Mode Range Current Limited Drivers and Thermal Shutdown Delayed Micropower Shutdown: 5μA Maximum (C-, I-Grade) Power Up/Down Glitch-Free Driver Outputs Low Operating Current: 370μA Typical in Receive Mode Compatible with TIA/EIA-485-A Specifications 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