LTC2854

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 www.DataSheet4U.com (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 ■ LTC2854/LTC2855 3.3V 20Mbps RS485/RS422 Transceivers with Integrated Switchable Termination DESCRIPTION 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 transceiv...