LTC2859CDD#TRPBF

Drivers, Receivers, Transceivers Overview

The LTC2859CDD#TRPBF is a low-power, half-duplex RS485/RS422 transceiver operating on a 5V supply. It features an integrated logic-selectable 120Ω termination resistor and supports up to 256 nodes per bus with its high input impedance. The device offers a maximum data rate of 20Mbps in normal mode and a reduced slew rate mode limited to 250kbps for EMI control. It includes enhanced ESD protection rated at ±15kV HBM, guaranteed failsafe receiver operation, current-limited drivers, and thermal shutdown. The component operates within a commercial 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 250kbps slew rate limiting mode
• Guaranteed failsafe receiver output state under floating or shorted input conditions
• Enhanced ESD protection withstands ±15kV human body model without latchup

Drivers, Receivers, Transceivers Applications

• Multi-node RS485 networks requiring end-of-line termination
• Backplane communication interfaces
• Level translation between different voltage domains
• Industrial automation systems with high noise environments

Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix matches the required package and temperature grade. Confirm that the tape and reel quantity aligns with production needs. Ensure the component source is authorized to guarantee authenticity and traceability. Check for any lead-free compliance documentation if required by regulatory standards.

Drivers, Receivers, Transceivers Selection Notes

Select this part for applications requiring integrated line termination to simplify PCB layout. Choose the C-grade variant for standard commercial temperature ranges. Consider the SLO pin functionality if electromagnetic interference mitigation is critical. Verify that the half-duplex architecture meets the system's communication topology requirements.

Drivers, Receivers, Transceivers Part Context

This component belongs to the LTC2859/LTC2861 family of 20Mbps RS485 transceivers. The LTC2859 provides half-duplex communication, whereas the LTC2861 offers full-duplex capability. Both share similar features like integrated termination and ESD protection but differ in driver/receiver configuration and package options.

Drivers, Receivers, Transceivers Replacement Considerations

LTC2859IDD#TRPBF (Industrial Grade)

Drivers, Receivers, Transceivers FAQ

How does the integrated termination resistor function?

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

What is the purpose of the SLO pin?

The SLO pin controls the driver slew rate. Driving it low activates a low-EMI mode that limits the data rate to approximately 250kbps to reduce high-frequency emissions.

Does the device support node counts beyond standard RS485 limits?

Yes, the high input impedance allows the LTC2859 to support up to 256 nodes on a single bus, exceeding the standard one-eighth unit load requirement.