SI32291-A-GMR

Telecom Overview

The Si32291-A-GMR is a dual Foreign Exchange Station (FXS) interface IC from Skyworks Solutions, operating within the Si3229x series. It integrates two complete telephony channels with DTMF detection and an Integrated Serial Interface (ISI). The device supports wideband audio and performs all BORSCHT functions. It operates on a 3.3 V supply with a maximum battery voltage of -140 V. The industrial grade (-40 to 85 °C) variant is housed in a 68-pin QFN package.

Telecom Feature Summary

• Integrates two FXS channels with DTMF detection and ISI digital interface
• Performs all BORSCHT functions including programmable DC feed and ringing generation
• Supports wideband audio for enhanced voice quality
• Includes integrated DC-DC controllers for optimized power efficiency

Telecom Applications

• VoIP gateways and routers
• Analog Terminal Adapters (ATA)
• Private Branch Exchange (PBX)

Telecom Procurement Notes

Verify the G suffix indicates industrial temperature range operation. Confirm the absence of the R suffix ensures tray packaging rather than tape and reel. Ensure the host system supports the 3-wire ISI protocol required by this specific model variant.

Telecom Selection Notes

Select this part over PCM variants when the host processor utilizes the 3-wire ISI interface. Choose the G-grade version for applications requiring extended temperature ranges compared to the F-grade commercial option. Verify DTMF detection requirements are met by this specific model number.

Telecom Part Context

This component belongs to the Si3229x family of ProSLIC devices. It shares the same physical package and core architecture as other models in the series, differing primarily in digital interface type and feature set such as DTMF detection capabilities.

Telecom Replacement Considerations

Si32291-A-FM serves as the commercial temperature equivalent. Si32290-A-GM is a compatible alternative if DTMF detection functionality is not required.