LTC2859HDD#PBF

Drivers, Receivers, Transceivers Overview

The LTC2859HDD#PBF is a half-duplex RS-485/RS-422 transceiver operating on a 5V supply. It features an integrated, logic-selectable 120Ω termination resistor and supports up to 256 nodes per bus with high input impedance. The device operates at data rates up to 20Mbps in normal mode and includes a low-EMI 250kbps slew-limited mode. Supply current is typically 900µA in receive mode. It provides enhanced ESD protection of ±15kV HBM, thermal shutdown, and guaranteed failsafe receiver operation over the entire common mode range.

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 for floating or shorted inputs
• Enhanced ESD protection rated at ±15kV human body model

Drivers, Receivers, Transceivers Applications

• Level translator applications
• Backplane transceiver systems
• Multi-node RS-485 networks requiring end termination control

Drivers, Receivers, Transceivers Procurement Notes

Verify the specific package marking code LBNX corresponds to the H-grade temperature rating. Confirm the DD package variant matches the required PCB footprint dimensions. Ensure the ordering suffix #PBF indicates lead-free finish compliance as specified in the manufacturer documentation.

Drivers, Receivers, Transceivers Selection Notes

Select this component for half-duplex communication requirements where integrated line termination simplifies network configuration. The H-grade designation ensures operation up to 105°C. Verify that the 5V supply voltage aligns with system power rails and that the 3mm x 3mm DFN package fits the available board space.

Drivers, Receivers, Transceivers Part Context

This part belongs to the LTC2859/LTC2861 family of low-power RS-485/RS-422 transceivers. The LTC2859 is the half-duplex variant, while the LTC2861 offers full-duplex capability. Both share identical electrical characteristics regarding termination, ESD protection, and low-EMI modes.

Drivers, Receivers, Transceivers Replacement Considerations

LTC2859CDD#PBF (Commercial grade, 0°C to 70°C)

Drivers, Receivers, Transceivers FAQ

How is the internal termination resistor enabled?

The internal 120Ω termination resistor is enabled by driving the TE (Termination Enable) pin high.

What is the maximum data rate in low-EMI mode?

When the SLO pin is driven low to activate the low-EMI mode, the maximum data rate is limited to 250kbps.

Does the device support multiple nodes on the bus?

Yes, the high input impedance allows for up to 256 nodes per bus in C-grade and I-grade devices.