SI32172-C-GM1R

Telecom Overview

The SI32172-C-GM1R is a single-channel ProSLIC FXS interface IC from Skyworks Solutions, operating on a 3.3 V supply with an Integrated Serial Interface (ISI). It supports battery voltages up to -110 V and operates within temperature ranges of 0°C to +70°C (F-grade) or -40°C to +85°C (G-grade). The device features wideband voice support, DTMF generation, and pulse metering. Key electrical parameters include a maximum supply current of 44.6 mA in active off-hook states and a continuous power dissipation of 0.75 W at 85°C ambient. It is housed in a 42-pin QFN package.

Telecom Feature Summary

• Integrates all BORSCHT functions for complete FXS telephony solutions
• Utilizes proprietary three-wire ISI combining PCM, SPI, and interrupt data
• Includes integrated tracking DC-DC controller for optimal battery voltage generation
• Supports global programmability via software for ringing and impedance parameters

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 grade suffix (F or G) required for your thermal environment before ordering. Confirm that the -110 V rating aligns with your line voltage requirements, as other variants offer higher ratings. Ensure the ISI interface compatibility with your host SoC is validated against the timing specifications provided in the datasheet.

Telecom Selection Notes

Select this component for short to medium loop applications requiring wideband audio. Compare against SI32173 if a -140 V battery rating is necessary. Verify that the host processor supports the three-wire ISI protocol rather than standard SPI or PCM interfaces. Consider thermal management requirements given the 0.75 W power dissipation limit in the QFN-42 package.

Telecom Part Context

This part belongs to the Si3217x family of pin-compatible ProSLIC products. It shares the same physical footprint and basic functionality with the SI32173 and SI32175, differing primarily in voltage ratings and feature sets like DTMF detection. The family is designed to replace legacy discrete SLIC solutions in compact telecom designs.

Telecom Replacement Considerations

Direct replacements within the same family include SI32173-C-GM1R for higher voltage tolerance (-140 V) and SI32175-C-GM1R which adds DTMF detection capabilities. All variants maintain pin compatibility.