LTC2870IUFD#TRPBF

Drivers, Receivers, Transceivers Overview

The LTC2870IUFD#TRPBF is a robust pin-configurable multiprotocol transceiver supporting RS232, RS485, and RS422 protocols. It operates on a single 3V to 5.5V supply voltage with a logic interface range of 1.7V to 5.5V. The device integrates two RS232 single-ended transceivers or one RS485 differential transceiver on shared I/O lines. It supports data rates up to 20Mbps for RS485 and 500kbps for RS232. An integrated DC/DC boost converter generates the necessary supplies for RS232 levels using a tiny 2mm × 1.6mm inductor. The component features automatic selection of integrated termination resistors (120Ω for RS485, 5kΩ for RS232) and half-/full-duplex switching.

Drivers, Receivers, Transceivers Feature Summary

• Pin-controlled integrated termination resistors allow for easy interface reconfiguration without external components.
• Half-duplex switches enable flexible four-wire and two-wire RS485 configurations.
• Logic loopback mode steers driver inputs to receiver outputs for diagnostic self-testing.
• RS485 receivers support up to 256 nodes per bus with full failsafe operation.

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 'I' grade designation matches the required industrial temperature range of –40°C to 85°C for your application environment. Ensure the QFN-28 package dimensions align with your PCB footprint requirements before finalizing procurement.

Drivers, Receivers, Transceivers Selection Notes

Select the LTC2870 variant when a shared I/O line configuration for RS485 and RS232 is sufficient. Choose the LTC2871 if independent control over two RS232 transceivers and one RS485 transceiver on dedicated lines is required. Consider the H-grade version if an extended operating temperature range up to 125°C is necessary for harsh environments.

Drivers, Receivers, Transceivers Part Context

This component belongs to the LTC2870/LTC2871 family of multiprotocol transceivers manufactured by Analog Devices Inc. It is designed to simplify serial communication interfaces by combining multiple protocol capabilities into a single chip. The device eliminates the need for discrete level shifters and termination networks through its integrated power management and termination features.

Drivers, Receivers, Transceivers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with existing circuit designs if considering alternative multiprotocol transceivers from other manufacturers.

Drivers, Receivers, Transceivers FAQ

How does the LTC2870 handle RS485 termination?

The device features automatic selection of integrated RS485 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 termination components.

What is the purpose of the Logic Loopback Mode?

Logic loopback mode internally routes the driver input logic levels to the receiver output pins. This feature applies to both RS232 channels and the RS485 driver/receiver, allowing for diagnostic self-testing without external loopback cables.

Can the LTC2870 operate with different logic voltages?

Yes, the device supports a logic interface range of 1.7V to 5.5V. The logic supply voltage (VL) must be less than or equal to the main supply voltage (VCC) for proper operation, allowing flexibility in interfacing with various microcontrollers.