LTC2855IDE#TRPBF

Drivers, Receivers, Transceivers Overview

The LTC2855IDE#TRPBF is a full-duplex RS485/RS422 transceiver operating on a 3.3V supply with a maximum data rate of 20Mbps. It features an integrated logic-selectable 120Ω termination resistor and supports up to 256 nodes per bus due to its one-eighth unit load input impedance. The device provides ±15kV HBM ESD protection on interface pins, guaranteed failsafe receiver operation, and current-limited drivers with thermal shutdown. It operates within a temperature range of –40°C to 85°C and is housed in a 12-lead (4mm × 3mm) plastic DFN package.

Drivers, Receivers, Transceivers Feature Summary

• Integrated switchable 120Ω termination resistor controlled by the TE pin
• Full-duplex architecture with separate driver and receiver channels
• Guaranteed failsafe receiver output under floating or shorted input conditions
• One-eighth unit load input impedance supporting high node counts

Drivers, Receivers, Transceivers Applications

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

Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix #TRPBF confirms tape and reel packaging for automated assembly. Confirm the IDE suffix corresponds to the industrial temperature grade of –40°C to 85°C. Ensure the component matches the 12-lead DFN package outline specified in the datasheet before integration into the bill of materials.

Drivers, Receivers, Transceivers Selection Notes

Select this model for applications requiring full-duplex communication at speeds up to 20Mbps. The integrated termination simplifies board layout compared to discrete solutions. Verify that the 3.3V supply voltage aligns with the system power rails and that the I-grade temperature range meets environmental requirements.

Drivers, Receivers, Transceivers Part Context

This component belongs to the LTC2854/LTC2855 family of low-power RS485/RS422 transceivers. While the LTC2854 offers half-duplex operation in a smaller 10-lead package, the LTC2855 provides full-duplex capability in a 12-lead DFN form factor. Both share similar electrical characteristics and protection features.

Drivers, Receivers, Transceivers Replacement Considerations

LTC2855HDE#TRPBF: Higher temperature grade (-40°C to 125°C).

Drivers, Receivers, Transceivers FAQ

How does the internal termination resistor function?

The internal 120Ω termination resistor can be enabled or disabled via the TE pin. When TE is high, the resistor connects between pins A and B to match cable impedance.

What is the failsafe mechanism of the receiver?

The receiver guarantees a logic-high output state when inputs are floating, shorted, or terminated without a driving signal, ensuring predictable idle states across the entire common mode range.

What is the maximum ESD protection rating for the interface pins?

The LTC2855 withstands ±15kV Human Body Model (HBM) ESD stress on the Y, Z, A, and B interface pins without latchup or damage.