SI32280-A-FMR

Telecom Overview

The Si32280-A-FMR is a dual Foreign Exchange Station (FXS) telephony interface IC from the Skyworks Si3228x series. It integrates two complete FXS channels within an 8 x 8 mm 56-pin QFN package, operating at a supply voltage of 3.3 V with a maximum battery voltage of -106 V across a commercial temperature range of 0 to 70 °C. The device supports ISI digital interfaces and performs all BORSCHT functions for analog telephone lines. Key capabilities include wideband voice support, programmable DC current loop feed ranging from 10 to 45 mA, and integrated test loads. The suffix 'R' indicates tape and reel packaging.

Telecom Feature Summary

• Integrates two complete FXS channels in a single compact package
• Performs all BORSCHT functions for standard telephony operations
• Supports wideband audio for improved voice quality
• Features flexible integrated tracking DC-DC controller

Telecom Applications

• VoIP gateways and routers
• Analog Terminal Adapters (ATA)
• Private Branch Exchange (PBX)
• Wireless Local Loop (WLL)

Telecom Procurement Notes

Verify that the ordering suffix matches the required packaging format, as the 'R' designation specifically denotes tape and reel configuration. Confirm the ISI interface requirement aligns with the host system design, distinguishing it from PCM variants. Ensure the commercial temperature rating meets the operational environment specifications before finalizing procurement orders.

Telecom Selection Notes

Select this component when dual-channel FXS functionality is required without DTMF detection or Smart Ringing features. The ISI interface is suitable for hosts supporting Integrated Serial Interface protocols. Compare against PCM-based models if daisy-chain connectivity or specific DSP-based tone generation is necessary for the target application architecture.

Telecom Part Context

This part belongs to the Si3228x family of Dual ProSLIC devices designed to replace traditional discrete telephony solutions. The Si32280 variant specifically targets applications requiring dual line support with ISI interfaces, excluding advanced features like DTMF detection found in higher-numbered siblings such as the Si32281 or Si32283.

Telecom Replacement Considerations

Si32280-A-FM serves as the tray-packaged equivalent. For designs requiring DTMF detection, consider the Si32281-A-FMR. Systems needing PCM interfaces should evaluate the Si32282-A-FMR instead.