3.3V 20Mbps RS485/RS422 Transceiver

The LTC2850, LTC2851 and LTC2852 are low power, 20Mbps RS485/RS422 transceivers operating on 3.3V supplies. 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 up to ±15kV (human body model) on the transceiver interface pins without latchup or damage.

Applications

* Low Power RS485/RS422 Transceiver

* Level Translator

* Backplane Transceiver

* 3.3V Supply Voltage

* 20Mbps Maximum Data Rate

* No Damage or Latchup Up to ±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: 370μA Typical in Receive Mode

* Compatible with TIA/EIA-485-A Specifications

* Available in 8-Pin and 10-Pin 3mm × 3mm DFN, 8-Pin and 10-Pin MSOP, and 8-Pin and 14-Pin SO Packages