LTC2871CFE#TRPBF

Drivers, Receivers, Transceivers Overview

The LTC2871CFE#TRPBF is a robust pin-configurable multiprotocol transceiver supporting RS-232, RS-485, and RS-422 protocols. It operates on a single 3V to 5.5V supply with a 1.7V to 5.5V logic interface. The device integrates one RS-485 transceiver and two independent RS-232 transceivers on dedicated I/O lines. It features an integrated DC/DC boost converter for RS-232 levels, software-selectable termination resistors (120Ω for RS-485, 5kΩ for RS-232), and half-/full-duplex switching. Maximum data rates are 20Mbps for RS-485 and 500kbps for RS-232. It supports up to 256 nodes per bus with full failsafe operation.

Drivers, Receivers, Transceivers Feature Summary

• Integrated DC/DC boost converter eliminates the need for multiple external supplies for driving RS-232 levels.
• Pin-controlled integrated termination resistors allow for easy interface reconfiguration without external components.
• Logic loopback mode steers driver inputs to receiver outputs for diagnostic self-test capabilities.
• RS-485 receivers feature full failsafe operation to prevent UART lockup during floating or shorted input conditions.

Drivers, Receivers, Transceivers Applications

• Point-of-sale terminals
• Cable repeaters
• Protocol translators

Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix #TRPBF indicates tape and reel packaging when sourcing this component. Confirm that the C-grade designation corresponds to the commercial operating temperature range of 0°C to 70°C. Ensure the FE package type matches the required 38-lead plastic TSSOP footprint for your PCB layout constraints.

Drivers, Receivers, Transceivers Selection Notes

Select the LTC2871 variant over the LTC2870 when independent control of two RS-232 transceivers and one RS-485 transceiver on dedicated I/O lines is required. Consider the H-grade option if operation in extended industrial temperatures (-40°C to 125°C) is necessary. Verify that the 38-pin TSSOP package dimensions fit within the available board space.

Drivers, Receivers, Transceivers Part Context

This component belongs to the LTC2870/LTC2871 family of multiprotocol transceivers designed for applications requiring flexible communication standards. Unlike the LTC2870 which shares I/O lines, the LTC2871 provides dedicated pins for its transceivers, simplifying circuit design for complex multi-protocol systems.

Drivers, Receivers, Transceivers Replacement Considerations

Public confirmed substitute part numbers: LTC2871CUHF#TRPBF, LTC2871IFE#TRPBF.

Drivers, Receivers, Transceivers FAQ

How does the LTC2871 handle RS-485 termination?

The device includes software-selectable integrated termination resistors. A logic high on the TE485 pin enables a 120Ω resistor between pins A and B, as well as between Y and Z, eliminating the need for external resistors.

What is the purpose of the Loopback (LB) pin?

Enabling the LB pin activates logic loopback mode, which internally routes the driver input logic levels directly to the receiver output pins. This allows for diagnostic self-testing of the transceiver functionality.

Can the LTC2871 operate with a 1.7V logic supply?

Yes, the device supports a logic supply voltage (VL) ranging from 1.7V to 5.5V, allowing compatibility with low-voltage microcontrollers while maintaining a separate 3V to 5.5V supply for the transceiver drivers.