SI32911-A-FSR

Telecom Overview

The SI32911-A-FSR is a single-channel ProSLIC subscriber line interface circuit (SLIC) and codec designed for foreign exchange office (FXO) applications. It operates from a 3.3 V supply with a voltage range of 3.13 V to 3.47 V and consumes 25 mA of supply current. The device supports FCC/CTR21 regions with one ringer threshold and two on-hook speeds, functioning within an ambient temperature range of 0°C to 70°C. It is housed in a 16-pin SOIC package with a width of 3.90 mm.

Telecom Feature Summary

• Provides greater than 5 kV isolation between the line side and digital control interfaces
• Supports Type I and Type II caller ID detection protocols
• Integrates a programmable digital hybrid for voice signal processing
• Includes an integrated ring detector for incoming call signaling

Telecom Applications

• VoIP DSL Gateways and Routers
• Analog Terminal Adapters (ATA)
• Integrated Access Devices (IAD)

Telecom Procurement Notes

Verify that the specific ordering suffix matches the required regional compliance standards, as the SI32911 variant is designated for FCC/CTR21 regions. Confirm the temperature grade corresponds to the operational environment requirements. Ensure the package type aligns with the PCB footprint specifications before finalizing procurement orders.

Telecom Selection Notes

Select this component when designing FXO interfaces requiring high-voltage isolation and standard telephony features. Compare against the Si32919 if global ringer thresholds or additional on-hook speed configurations are necessary. Ensure the host system provides the required 3.3 V power rail and compatible SPI or PCM digital interface connections.

Telecom Part Context

This part belongs to the Silicon Laboratories Si3291x family of ProSLIC devices, which are pin-compatible with the Si3217x FXS series. The Si3291x series enables seamless connection to FXS line-side devices using patented capacitive isolation technology. This specific model serves as the office-side interface counterpart to station-side solutions.

Telecom Replacement Considerations

The Si32919-A-FS is a documented alternative within the same product family. Selection depends on whether the application requires global ringer thresholds and three on-hook speeds instead of the FCC/CTR21 specific configuration provided by the SI32911.