SI32171-C-GM1

Telecom Overview

The Skyworks Solutions SI32171-C-GM1 is a single-channel ProSLIC FXS interface IC designed for telecom applications. It operates from a 3.3 V supply (3.13 V to 3.47 V) with 1.8 V or 3.3 V I/O options. The device supports battery voltages up to -110 V and includes an integrated tracking DC-DC controller. Key electrical parameters include a typical supply current of 44.6 mA in active off-hook mode, a maximum junction temperature of 145 °C for the linefeed die, and operation within a commercial temperature range of 0 °C to 70 °C. It features PCM and SPI digital interfaces, DTMF detection, and pulse metering capabilities.

Telecom Feature Summary

• Performs all BORSCHT functions for a complete FXS solution
• Integrated tracking DC-DC controller with direct connection to MOSFET
• Supports PCM and SPI bus digital interfaces with programmable interrupts
• Includes DTMF detection and pulse metering functionalities

Telecom Applications

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

Telecom Procurement Notes

Verify the specific voltage rating (-110 V vs -140 V) and package type (QFN vs LGA) against the datasheet ordering guide, as suffixes define these attributes. Confirm the G-grade temperature range suitability for the target environment. Ensure the design accounts for the thermal resistance requirements of the exposed pad for proper heat dissipation during high-current loop feed operations.

Telecom Selection Notes

Select this component for short to medium loop telephony applications requiring a single-chip FXS solution. Verify compatibility with the host system's digital interface, choosing between PCM or SPI modes. Ensure the power supply architecture can support the integrated DC-DC controller requirements. Consider the -110 V battery rating sufficient for standard ringing voltages unless higher ratings are explicitly required by regional specifications.

Telecom Part Context

The SI32171-C-GM1 belongs to the Si3217x-C family of ProSLIC products. These devices are pin-compatible single-channel solutions implementing FXS interfaces according to LSSGR, ITU, and ETSI specifications. The 'C' revision denotes the specific generation with QFN/LGA packaging, distinct from earlier revisions like the Si3217x-B series which may have different package options or feature sets.

Telecom Replacement Considerations

Direct pin-compatible replacements within the same C-series family include the SI32170-C-GM1R (with DTMF generation), SI32174-C-GM1R (wideband voice), and SI32176-C-GM1R (wideband voice). For legacy designs, the Si3217x-B series offers similar functionality but may require package adaptation.