LTC2855HDE#PBF

Drivers, Receivers, Transceivers Overview

The LTC2855HDE#PBF is a full-duplex RS485/RS422 transceiver operating on a 3.3V supply within the LTC2854/LTC2855 series. It features a maximum data rate of 20Mbps and operates over an extended temperature range of -40°C to +125°C (H-Grade). The device integrates a logic-selectable 120Ω termination resistor between pins A and B, controlled by the TE pin. It supports up to 256 nodes per bus due to its one-eighth unit load receiver input resistance. ESD protection withstands ±15kV on interface pins without latchup. The package is a 12-lead 4mm × 3mm Plastic DFN with an exposed thermal pad.

Drivers, Receivers, Transceivers Feature Summary

• Integrated switchable 120Ω termination resistor for optimized signal fidelity
• Full-duplex operation with separate driver and receiver channels
• Guaranteed failsafe receiver output under floating or shorted input conditions
• High input impedance supporting extensive node counts on the bus

Drivers, Receivers, Transceivers Applications

• Industrial communication networks requiring robust fault protection
• Building automation systems utilizing RS485/RS422 protocols
• Backplane transceiver interfaces in embedded systems
• Level translation applications for 3.3V logic systems

Drivers, Receivers, Transceivers Procurement Notes

Verify the H-grade suffix indicates the -40°C to +125°C operating range. Confirm the DE suffix corresponds to the 12-lead DFN package. Ensure the #PBF designation confirms lead-free compliance. Cross-reference the manufacturer part number with official Analog Devices documentation to validate specifications before integration.

Drivers, Receivers, Transceivers Selection Notes

Select this component when full-duplex communication is required alongside integrated line termination. The H-grade variant is necessary for high-temperature industrial environments exceeding standard commercial limits. Compare against the half-duplex LTC2854 if bidirectional single-wire transmission suffices. Verify that the 3.3V supply voltage aligns with the system power architecture.

Drivers, Receivers, Transceivers Part Context

This component belongs to the LTC2854/LTC2855 family of low-power transceivers designed for RS485 and RS422 standards. The series differentiates between half-duplex (LTC2854) and full-duplex (LTC2855) architectures. The HDE#PBF variant specifically denotes the full-duplex version housed in a compact 12-lead DFN package with extended temperature capabilities.

Drivers, Receivers, Transceivers Replacement Considerations

Public confirmed substitutes include the LTC2854HDE#PBF for half-duplex applications and other grade variants such as LTC2855IDE#PBF for lower temperature ranges. Package-compatible alternatives within the same series should be evaluated based on specific duplex requirements and thermal constraints.

Drivers, Receivers, Transceivers FAQ

How does the internal termination resistor function?

The internal 120Ω termination resistor connects between pins A and B when the TE (Termination Enable) pin is driven high. This allows for dynamic control of line termination without external components.

What is the failsafe feature of the receiver?

The receiver guarantees a logic-high output state when the inputs are floating, shorted together, or terminated but not actively driven. This ensures a known idle state across the entire common mode range.

What is the ESD protection rating for the interface pins?

The LTC2855 provides enhanced ESD protection capable of withstanding ±15kV on the transceiver interface pins (A, B, Y, Z) using the Human Body Model without damage or latchup.