LTC2873CUFD#PBF

Drivers, Receivers, Transceivers Overview

The LTC2873CUFD#PBF is a single-bus RS485/RS232 multiprotocol transceiver manufactured by Analog Devices Inc. It supports RS232, RS485, and RS422 protocols using a single 3V to 5.5V supply voltage. The device features an integrated DC/DC boost converter generating VDD (+7.0V) and VEE (-6.3V), eliminating the need for multiple external power rails. It operates at data rates up to 20Mbps for RS485 and up to 1Mbps for RS232. The component includes switchable termination resistors (120Ω for RS485, 5kΩ for RS232) and provides ±26kV HBM ESD protection on interface pins. It is housed in a 24-lead 4mm x 5mm QFN package with an operating temperature range of 0°C to 70°C.

Drivers, Receivers, Transceivers Feature Summary

• Pin-configurable multiprotocol support for RS232, RS485, and RS422 over a shared two-pin bus
• Integrated DC/DC boost converter eliminates requirement for separate positive and negative supply voltages
• Software-selectable internal termination resistors remove dependency on external components and relays
• High electrostatic discharge immunity rated at ±26kV HBM on bus interface pins

Drivers, Receivers, Transceivers Applications

• Industrial sensors and actuators
• Alarm systems
• Traffic control and monitoring
• Highway signs and jumbo displays

Drivers, Receivers, Transceivers Procurement Notes

Verify the specific suffix CUFD#PBF corresponds to the commercial grade (0°C to 70°C) variant rather than industrial or high-temperature grades. Confirm that the 24-lead QFN footprint matches the PCB layout requirements. Ensure the design accounts for the exposed pad connection to maintain thermal performance and electrical grounding as specified in the datasheet.

Drivers, Receivers, Transceivers Selection Notes

Select this component when system architecture requires switching between RS232 and RS485 protocols on a single physical bus without mechanical relays. It is suitable for designs constrained by space due to the compact QFN package and minimal external passive component count. Verify logic supply compatibility, as the VL pin supports levels from 1.7V to 5.5V.

Drivers, Receivers, Transceivers Part Context

This part belongs to the LTC2873 family of multiprotocol transceivers. Other variants include the LTC2873IUFD#PBF for extended industrial temperatures (-40°C to 85°C) and the LTC2873HUFD#PBF for high-temperature applications (-40°C to 125°C). All variants share identical electrical characteristics and pinouts but differ in their qualified operating temperature ranges.

Drivers, Receivers, Transceivers Replacement Considerations

LTC2873IUFD#PBF

Drivers, Receivers, Transceivers FAQ

How does the device manage RS232 power generation?

The LTC2873 utilizes an internal pulse-skipping boost regulator to generate a +7.0V VDD rail and a -6.3V VEE rail from the single 3V to 5.5V VCC input, requiring only a 10µH inductor and a few capacitors.

What is the function of the TE485 pin?

The TE485 pin controls the integrated 120Ω termination resistor. A logic low enables the resistor between the A/DO and B/RI pins in RS485 mode, while a logic high disables it.

Can the driver and receiver be enabled independently in RS485 mode?

Yes, in RS485 mode, the DE485/F232 pin controls the driver enable state and the RE485 pin controls the receiver enable state, allowing independent operation.