LTC2859CDD#PBF

Drivers, Receivers, Transceivers Overview

The LTC2859CDD#PBF is a low-power, half-duplex RS485/RS422 transceiver operating on a 5V supply (4.5V to 5.5V). It supports data rates up to 20Mbps and features an integrated logic-selectable 120Ω termination resistor. The device includes a failsafe receiver that guarantees a high output state when inputs are floating or shorted. It offers a logic-selectable low-EMI mode limited to 250kbps and provides ±15kV HBM ESD protection without latchup. The C-grade variant operates within a temperature range of 0°C to 70°C and is housed in a 10-lead 3mm × 3mm DFN package.

Drivers, Receivers, Transceivers Feature Summary

• Integrated switchable 120Ω termination resistor controlled by the TE pin
• Logic-selectable low-EMI mode limiting data rate to 250kbps
• Guaranteed failsafe receiver operation for floating or shorted inputs
• Enhanced ESD protection withstanding ±15kV human body model

Drivers, Receivers, Transceivers Applications

• Multi-node RS485 networks requiring end-of-line termination
• Industrial control systems with high EMI sensitivity
• Backplane communication interfaces
• Level translation between 5V and 3.3V logic domains

Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix matches the required package and temperature grade. Confirm RoHS compliance status through official manufacturer documentation. Ensure the component source is authorized to guarantee authenticity and traceability. Check for any lead-free finish specifications if required by assembly processes.

Drivers, Receivers, Transceivers Selection Notes

Select this part for applications requiring integrated line termination to simplify PCB layout. Choose the C-grade version for commercial temperature ranges. Consider the SLO pin functionality if electromagnetic interference reduction is critical at lower data rates. Verify that the half-duplex configuration aligns with the system's communication requirements.

Drivers, Receivers, Transceivers Part Context

This component belongs to the LTC2859/LTC2861 family of 20Mbps RS485 transceivers. The LTC2859 is the half-duplex variant, while the LTC2861 is the full-duplex counterpart. Both share similar electrical characteristics and feature sets, differing primarily in driver and receiver channel configurations.

Drivers, Receivers, Transceivers Replacement Considerations

LTC2859IDD#PBF: Same function with extended industrial temperature range (-40°C to 85°C).

Drivers, Receivers, Transceivers FAQ

How does the failsafe feature operate?

The receiver guarantees a high output state when the A and B inputs are shorted, left open, or terminated without a valid signal driving them.

What is the purpose of the SLO pin?

Driving the SLO pin low enables a reduced slew rate mode, limiting the data rate to approximately 250kbps to minimize high-frequency EMI emissions.

Can the internal termination resistor be enabled during thermal shutdown?

No, the integrated termination resistor cannot be enabled by the TE pin if the device is unpowered or in thermal shutdown mode.