SI32176-B-FMR

Telecom Overview

The Si32176-B-FMR is a single-channel ProSLIC FXS telephony interface IC operating from a 3.3 V supply. It implements complete BORSCHT functions and supports wideband voice with DTMF detection. The device features a tracking DC-DC controller for optimal battery voltage generation, supporting a maximum battery voltage of –110 V. It interfaces via standard PCM or SPI digital protocols. Electrical specifications include a typical idle channel noise of 8 dBrnC (C-message weighted) and a PSRR of 55 dB. The component operates within an ambient temperature range of 0 to 70 °C and is housed in a 5x7 mm 42-pin QFN package.

Telecom Feature Summary

• Performs all BORSCHT line signaling functions including ringing generation and caller ID
• Integrates a tracking DC-DC controller to automatically generate required battery voltages
• Supports wideband voice transmission and DTMF detection capabilities
• Utilizes patented low-power ringing technology for energy efficiency

Telecom Applications

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

Telecom Procurement Notes

Verify the specific suffix 'B-FM' corresponds to the –110 V battery rating and commercial temperature grade (0 to 70 °C). Confirm that the 'R' designation indicates RoHS compliance as per the ordering guide. Ensure the source document explicitly links this part number to these electrical characteristics before procurement.

Telecom Selection Notes

Select this component for short to medium loop applications requiring global programmability and simplified diagnostics. It is suitable for designs needing integrated FXS functionality without external line drivers. Consider the –110 V rating if higher ringing voltages are not required. Verify compatibility with the host processor's PCM or SPI interface requirements.

Telecom Part Context

This device belongs to the Si3217x family of pin-compatible ProSLIC products. It serves as a single-chip solution for foreign exchange station interfaces. The family includes variants with different battery voltage ratings (-110 V or -135 V) and temperature grades. Some parts support optional FXO isolation when paired with Si3291x series devices.

Telecom Replacement Considerations

Si32176-B-GM offers identical electrical performance but supports an extended industrial temperature range of –40 to 85 °C. Other family members like Si32177 provide higher battery voltage ratings (-135 V) for longer loops.