LTC2870IUFD#PBF

Drivers, Receivers, Transceivers Overview

The LTC2870IUFD#PBF is a robust, pin-configurable multiprotocol transceiver supporting RS-232, RS-485, and RS-422 standards. It operates on a single 3V to 5.5V supply with a logic interface range of 1.7V to 5.5V. The device integrates an internal DC/DC boost converter for RS-232 generation, eliminating external supplies. Key electrical parameters include a maximum data rate of 20Mbps for RS-485 and 500kbps for RS-232. It features integrated termination resistors (120Ω for RS-485, 5kΩ for RS-232) and supports up to 256 nodes per bus. The component is housed in a 28-lead QFN package and operates within a temperature range of -40°C to 85°C.

Drivers, Receivers, Transceivers Feature Summary

• Pin-configurable architecture allows flexible implementation of RS-232, RS-485, or RS-422 protocols on shared I/O lines.
• Integrated DC/DC boost converter generates required RS-232 voltage levels using minimal external components.
• Hardware-controlled automatic selection of integrated termination resistors simplifies bus configuration.
• High electrostatic discharge protection ratings ensure reliability in harsh industrial environments.

Drivers, Receivers, Transceivers Applications

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

Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix against manufacturer documentation to confirm package type and temperature grade. Ensure the procurement channel provides valid traceability for Analog Devices components. Confirm that the delivered part matches the exact model number specifications regarding lead-free finish and RoHS compliance status before integration into production systems.

Drivers, Receivers, Transceivers Selection Notes

Select this component when designing systems requiring simultaneous support for multiple serial communication protocols without external protocol switching hardware. The integrated termination and boost converter reduce bill of materials count. Verify that the application environment falls within the specified operating temperature range and that the available PCB space accommodates the 28-lead QFN footprint requirements.

Drivers, Receivers, Transceivers Part Context

This component belongs to the LTC2870/LTC2871 family of multiprotocol transceivers manufactured by Analog Devices Inc. The 'I' designation indicates an industrial temperature grade variant. The 'UFD' suffix specifies the 28-lead plastic QFN package format. This series is designed to replace discrete transceiver solutions by consolidating multiple protocol functions into a single integrated circuit.

Drivers, Receivers, Transceivers Replacement Considerations

LTC2870CFD#PBF

Drivers, Receivers, Transceivers FAQ

How does the device handle RS-485 termination?

The LTC2870IUFD#PBF includes integrated termination resistors that can be enabled via the TE485 pin. A logic high enables a 120Ω resistor between pins A and B, as well as between Y and Z, while a logic low opens these resistors.

What is the function of the H/F pin?

The H/F pin selects the RS-485 operational mode. A logic low configures the device for full-duplex operation where pins A and B serve as receiver inputs and Y and Z as driver outputs. A logic high configures half-duplex mode where Y and Z act as both inputs and outputs.

Can the device operate with a 1.7V logic supply?

Yes, the device supports a logic supply voltage (VL) ranging from 1.7V to 5.5V, provided that VL does not exceed the main VCC supply voltage during normal operation.