SI32261-C-GMR

Telecom Overview

The SI32261-C-GMR is a dual-channel Foreign Exchange Station (FXS) interface integrated circuit from the ProSLIC family, manufactured by Skyworks Solutions. It operates on a 3.3 V supply and supports battery voltages up to -140 V for high-voltage ringing applications. The device integrates two complete telephony channels within an 8 x 8 mm 60-pin QFN package. Key electrical specifications include a supply voltage range of 3.13 V to 3.47 V, a maximum DC feed current of 45 mA, and an idle channel noise level of 8 dBrnC (C-message weighted). It features built-in DSP capabilities for self-testing and metallic loop testing.

Telecom Feature Summary

• Performs all BORSCHT functions including battery feed, overvoltage protection, ring generation, supervision, transhybrid balance, coding, and test capabilities.
• Integrates internal balanced or unbalanced ringing generators with patented low-power adaptive ringing technology.
• Supports wideband audio transmission for improved voice quality compared to standard PSTN interfaces.
• 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 configuration. Confirm the 'G' grade designation corresponds to the extended industrial temperature range of -40°C to +85°C. Ensure compatibility with the required battery voltage rating of -140 V for the intended line application.

Telecom Selection Notes

Select this model when high-voltage ringing support up to -140 V is required, distinguishing it from the Si32260 variant limited to -110 V. Choose the G-grade version for environments requiring operation below 0°C. Verify that the system design accommodates the 60-pin QFN footprint and utilizes the internal DC-DC controller architecture.

Telecom Part Context

This component belongs to the Si32260/61 Dual ProSLIC series, which implements two complete FXS telephony interfaces in a single package. The Si32261 variant specifically supports higher battery voltage ratings (-140 V) compared to the Si32260 (-110 V), making it suitable for applications demanding robust ringing signals.

Telecom Replacement Considerations

Si32261-C-GM is the identical functional equivalent packaged in cut tape rather than tape and reel.

Telecom FAQ

What is the maximum battery voltage supported by the Si32261?

The Si32261 supports a maximum battery voltage of -140 V, enabling high-voltage ringing capabilities.

Does the device support wideband audio?

Yes, the Si32261 supports wideband audio to provide better-than-PSTN voice quality.

How is the DC-DC conversion handled internally?

The device includes built-in DC-DC converter controllers that can be used to automatically generate the optimal battery voltage required for each line state.