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LTC2858 - 20Mbps and Slew Rate Limited 15kV RS485/RS422 Transceiver

The LTC2856-1, LTC2856-2, LTC2857-1, LTC2857-2, LTC2858-1 and LTC2858-2 are low power, RS485/RS422 transceivers operating on 5V supplies at maximum data rates of 20Mbps or 250kbps for low EMI. The receiver has a 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 thermal shutdown.

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

Features 20Mbps or Low EMI 250kbps Maximum Data Rate No Damage or Latchup to ESD: ±15kV 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: 900µA Maximum in Receive Mode Compatible with TIA/EIA-485-A Specifications Available in 8-Lead and 10-Lead 3mm × 3mm DFN and 8-Lead and 10-Lead MSOP Packages Typical Application

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