SI32291-A-FM

Telecom Overview

The Si32291-A-FM is a dual Foreign Exchange Station (FXS) telephony interface from Skyworks Solutions. It integrates two complete analog telephone channels within an 8x8 mm 68-pin QFN package, performing all BORSCHT functions. The device operates on a 3.3 V supply and supports a maximum battery voltage of -140 V. It features a 3-wire ISI digital interface and includes built-in DTMF detection capabilities. The component supports wideband audio for enhanced voice quality and incorporates integrated DC-DC converter controllers to optimize efficiency.

Telecom Feature Summary

• Integrates two complete FXS channels with full BORSCHT functionality in a single compact package
• Supports wideband audio transmission and reception for superior voice clarity
• Includes built-in DSP for metallic loop testing and self-diagnostic capabilities
• Features patented Smart Ringing technology to reduce peak current requirements

Telecom Applications

• VoIP gateways and routers
• xDSL Integrated Access Devices (IADs)
• Analog Terminal Adapters (ATA)
• Wireless Local Loop (WLL) systems

Telecom Procurement Notes

Verify the specific suffix 'FM' indicates commercial temperature range operation (0 to 70 °C). Confirm the presence of DTMF detection features as defined by the '1' in the part number. Ensure the ordering suffix matches the required shipping option, noting that adding 'R' denotes tape and reel packaging.

Telecom Selection Notes

Select this model when a 3-wire ISI interface is required alongside DTMF detection. Compare against the Si32290 if DTMF detection is unnecessary, or the Si32292/3 if PCM interface support is preferred. Consider the industrial grade variant if operation below 0 °C is necessary.

Telecom Part Context

This component belongs to the Si3229x series of ProSLIC devices. It shares the same physical footprint and core architecture with other variants in the family, differing primarily in interface type, diagnostic features, and operating temperature ranges.

Telecom Replacement Considerations

Public confirmed substitutes include the Si32291-A-GM for industrial temperature range applications. For designs requiring PCM interfaces instead of ISI, consider the Si32293-A-FM.