SI32261-C-ZM2R

Telecom Overview

The Skyworks SI32261-C-ZM2R is a single-chip dual ProSLIC device implementing two complete foreign exchange station (FXS) telephony interfaces. It operates from a 3.3 V supply with a voltage range of 3.13 V to 3.47 V and supports linefeed voltages up to -140 V. The component features standard PCM/SPI or GCI digital interfaces, integrated dc-dc converter controllers for battery voltage optimization, and wideband audio support. It is available in 6x8 mm (47-pin QFN) or 8x8 mm (60-pin QFN) packages.

Telecom Feature Summary

• Performs all BORSCHT functions including loop feed, supervision, ringing, testing, hybrid connection, and tone generation.
• Supports adaptive ringing with software-programmable frequency, amplitude, cadence, and waveshape.
• Includes built-in DSP, monitor ADC, and test load for self-testing and metallic loop testing (MLT).
• Features integrated dc-dc controllers with direct connection to MOSFET for efficient power management.

Telecom Applications

• VoIP gateways and routers
• xDSL IADs
• Optical Network Terminals/Units (ONT/U)
• Analog Terminal Adapters (ATA)

Telecom Procurement Notes

Verify the specific package option required, as the ZM2 suffix indicates a particular configuration within the Si32261 family. Confirm that the selected package aligns with the intended board layout and thermal requirements. Ensure compatibility with the ProSLIC API for simplified configuration and diagnostics during the integration phase.

Telecom Selection Notes

Select this model when high-voltage ringing up to -140 V is required compared to the -110 V rating of the Si32260 variant. Consider the package size constraints, choosing between the 47-pin 6x8 mm or 60-pin 8x8 mm QFN based on available PCB space. Verify that the application benefits from the internal dc-dc controller's tracking shared supply mode if cost reduction is a priority.

Telecom Part Context

The SI32261 belongs to the Si32260/1 Dual ProSLIC series, which are industry-standard subscriber line interface concepts. This series is designed to replace discrete FXS solutions by integrating analog front-end, codec, and control logic into a single chip, reducing bill of materials and board complexity for telecom equipment manufacturers.

Telecom Replacement Considerations

Public confirmed substitute part numbers: SI32261-C-GM1R, SI32261-C-FM1R.