SI32261-C-GM1R

Telecom Overview

The Si32261-C-GM1R is a dual Foreign Exchange Station (FXS) telephony interface IC from the ProSLIC family. It integrates two complete FXS channels within an 8 x 8 mm 60-pin QFN package, supporting linefeed voltage ratings of -140 V for high-voltage ringing applications. The device operates on a 3.3 V supply with a range of 3.13 V to 3.47 V and functions across a temperature range of -40 °C to +85 °C. It features built-in DC-DC controllers, DSP-based diagnostics, and supports PCM/SPI or GCI digital interfaces.

Telecom Feature Summary

• Performs all BORSCHT functions including battery feed, overvoltage protection, ring generation, supervision, testing, hybrid connection, and tone/dialing.
• Integrates internal balanced or unbalanced ringing generators with patented low-power adaptive ringing capabilities.
• Supports wideband audio transmission for improved voice quality compared to standard PSTN systems.
• Includes integrated DC-DC controllers that connect directly to external MOSFETs to optimize power efficiency.

Telecom Applications

• VoIP gateways and routers
• xDSL Integrated Access Devices (IADs)
• Analog Terminal Adapters (ATA)
• Wireless Local Loop (WLL) systems

Telecom Procurement Notes

Verify the specific ordering suffix 'R' indicates tape and reel packaging when sourcing components. Confirm the 'G' grade designation matches the required industrial temperature range of -40 °C to +85 °C for your deployment environment. Ensure compatibility with the -140 V battery voltage rating specified for the Si32261 variant.

Telecom Selection Notes

Select this component for designs requiring dual FXS channels in a compact footprint. Choose the Si32261 variant specifically if the application demands support for high-voltage ringing up to -140 V. The G-grade version is necessary for environments requiring operation below 0 °C. Verify that the system architecture can accommodate the required external MOSFETs for the integrated DC-DC controllers.

Telecom Part Context

This part belongs to the Si32260/61 Dual ProSLIC series manufactured by Skyworks Solutions Inc. (formerly Silicon Laboratories). It is functionally similar to the Si32260 but distinguished by its higher voltage tolerance. The 'GM1R' suffix denotes the G-grade temperature range, QFN-60 package, and tape-and-reel shipping format.

Telecom Replacement Considerations

The Si32261-C-GM1 is the non-reel equivalent of this component. For lower voltage requirements, the Si32261-C-FM1R offers a -110 V rating with commercial temperature limits. The Si32260-C-GM1R provides identical functionality but is rated for -110 V battery voltage.

Telecom FAQ

What is the maximum loop resistance supported by the Si32261?

The device supports a maximum loop resistance of 2000 Ω when the loop current is 18 mA and the battery voltage is -52 V.

How does the device manage power consumption during ringing?

It utilizes patented low-power ringing technology and adaptive ringing features to minimize energy usage while maintaining effective signaling.

What digital interfaces are available for control?

The Si32261 supports standard PCM/SPI bus interfaces as well as GCI (Global Circuit Interface) modes for connecting to digital signal processors.