LTC2855HDE#TR

Drivers, Receivers, Transceivers Overview

The LTC2855HDE#TR is a full-duplex RS-485/RS-422 transceiver manufactured by Analog Devices. It operates on a single 3.0V to 3.6V supply and supports data rates up to 20Mbps. The device features an integrated, logic-selectable 120Ω termination resistor between pins A and B. It provides enhanced ESD protection withstanding ±15kV Human Body Model on interface pins without latchup or damage. The receiver input resistance exceeds 96kΩ (C-, I-Grade), representing a one-eighth unit load that supports up to 256 nodes per bus. The driver maintains high output impedance when disabled and includes current limiting and thermal shutdown for fault protection.

Drivers, Receivers, Transceivers Feature Summary

• Integrated switchable 120Ω termination resistor controlled via the TE pin
• One-eighth unit load receiver input supporting up to 256 nodes
• Enhanced ESD protection rated at ±15kV HBM on interface pins
• Guaranteed failsafe operation ensuring high output state during floating inputs

Drivers, Receivers, Transceivers Applications

• Supervisory Control and Data Acquisition (SCADA) systems
• Industrial control and instrumentation networks
• Building automation and security systems
• HVAC control applications

Drivers, Receivers, Transceivers Procurement Notes

Verify the specific temperature grade suffix required for the application environment. The 'H' designation indicates operation up to 125°C, while 'C' and 'I' grades cover lower ranges. Confirm package availability matches the DFN-12 footprint requirements. Ensure ordering specifications align with lead-free finish standards if RoHS compliance is mandatory for the project.

Drivers, Receivers, Transceivers Selection Notes

Select the LTC2855 over the half-duplex LTC2854 when simultaneous bidirectional communication is required. Verify that the system voltage remains within the 3.0V to 3.6V range. Consider the H-grade variant if the operating temperature exceeds 85°C. Ensure the PCB layout accommodates the 4mm x 3mm DFN package dimensions and exposed pad thermal connection.

Drivers, Receivers, Transceivers Part Context

This component belongs to the LTC2854/LTC2855 family of low-power RS-485/RS-422 transceivers. It shares architectural similarities with the LTC2854 but differs in providing full-duplex capability through separate Y and Z driver outputs. The series is designed for robust industrial communication where power consumption and node density are critical constraints.

Drivers, Receivers, Transceivers Replacement Considerations

The LTC2862A is a pin-compatible alternative offering higher fault protection ratings. The LT1785 is another compatible option within the portfolio. Verify electrical characteristics and package compatibility before substitution.