SI32171-B-FMR

Telecom Overview

The SI32171-B-FMR is a single-channel ProSLIC FXS telephony interface IC from the Si3217x family, manufactured by Skyworks Solutions Inc. It operates on a 3.3 V supply and supports PCM/SPI digital interfaces. This component provides DTMF detection and pulse metering capabilities with a maximum battery voltage rating of -110 V. It functions within an ambient temperature range of 0 to 70 °C (F-Grade). The device performs all BORSCHT functions and includes an integrated DC-DC controller for optimal line-state battery voltage generation.

Telecom Feature Summary

• Performs complete BORSCHT functions for foreign exchange station applications
• Integrates patented low-power ringing generator technology
• Supports wideband voice transmission and DTMF detection
• Includes tracking DC-DC controller for automatic battery voltage optimization

Telecom Applications

• Customer Premise Equipment (CPE)
• VoIP DSL Gateways and Routers
• Wireless Local Loop (WLL) systems
• Integrated Access Devices (IAD)

Telecom Procurement Notes

Verify the specific ordering suffix against official Skyworks documentation to confirm the exact electrical characteristics and temperature grade. Confirm that the F-Grade designation aligns with the required industrial operating range of 0 to 70 °C for the target deployment environment.

Telecom Selection Notes

Select this model when DTMF detection and pulse metering are required alongside standard FXS functionality. Ensure the system design accommodates the -110 V maximum battery voltage limit. Verify compatibility with the 42-pin QFN package dimensions and thermal requirements for the intended enclosure.

Telecom Part Context

This part belongs to the Si3217x family of pin-compatible ProSLIC products designed for global programmability. It implements LSSGR, ITU, and ETSI specifications for telephony interfaces. The series supports simplified configuration via the ProSLIC API and offers low power standby operation suitable for various analog terminal adapter implementations.

Telecom Replacement Considerations

The Si32171-B-GM serves as a direct replacement variant offering the same functional features but with an extended temperature range of -40 to 85 °C. Ensure the application environment remains within the 0 to 70 °C limits if substituting the F-Grade version.