SI32173-C-FM1R

Telecom Overview

The SI32173-C-FM1R is a single-channel ProSLIC FXS telephony interface IC from the Si3217x family. It operates on a 3.3 V supply with 1.8 V I/O support and utilizes a proprietary three-wire ISI digital interface for SoC connectivity. The device performs all BORSCHT functions, supports wideband voice, and includes DTMF generation. It features an integrated tracking DC-DC controller capable of generating battery voltages up to –140 V. The component is housed in a 5x7 mm 42-pin QFN package and operates within a temperature range of 0 °C to 70 °C.

Telecom Feature Summary

• Integrates complete FXS solution with patented low power ringing and tracking DC-DC controller
• Supports wideband voice transmission and software-programmable line parameters
• Features proprietary three-wire ISI bus combining PCM, SPI, and interrupt data

Telecom Applications

• Customer Premise Equipment (CPE)
• VoIP DSL Gateways and Routers
• Integrated Access Devices (IAD)

Telecom Procurement Notes

Verify the specific ordering suffix against official Skyworks documentation to confirm voltage ratings and temperature grades. Ensure compatibility with the target system's ISI interface requirements. Confirm RoHS compliance status through manufacturer datasheets before finalizing procurement specifications.

Telecom Selection Notes

Select this model when a three-wire ISI interface is required instead of standard PCM or SPI. The –140 V battery rating distinguishes it from lower-voltage variants like the SI32172. Verify that the application environment remains within the 0 °C to 70 °C operating range specified for the FM1R suffix.

Telecom Part Context

This component belongs to the Si3217x-C series of ProSLIC devices designed for global programmability. It shares pin compatibility with other members of the family, such as the SI32170 and SI32171, facilitating design flexibility across different loop resistance and voltage requirements within the same package footprint.

Telecom Replacement Considerations

The SI32173-C-GM1R serves as a direct replacement variant offering an extended industrial temperature range of –40 °C to 85 °C while maintaining identical electrical characteristics and interface protocols.