LE9551CMQC

Telecom Overview

The LE9551CMQC is a single-channel high-voltage ringing subscriber line interface circuit (SLIC) from Microsemi. It operates with a -100 V ringing battery and supports 7-kHz wideband applications. The device provides battery feed, ringing, and supervision for voice loops in short-loop cable systems. It interfaces via a serial bus with reset functionality and supports GR909 testing. Key electrical parameters include a power consumption of 236 mW maximum in the ring state at -100 V, a longitudinal-to-metallic balance of 52 dB, and a PSRR of 40 dB minimum. Gain flatness is maintained within ±0.05 dB across specified frequency bands.

Telecom Feature Summary

• Single-channel design optimized for residential gateways
• High voltage ringing capability up to -100 V
• Serial interface control and status reporting
• Integrated thermal shutdown protection

Telecom Applications

• Short-loop residential gateways
• Voice loop battery feed and supervision
• GR909 compliant telephony testing

Telecom Procurement Notes

Verify component authenticity through authorized channels as this is a specialized telecommunications IC. Confirm package integrity upon receipt, as the QFN form factor requires careful handling during inspection. Ensure compatibility with system voltage requirements before integration.

Telecom Selection Notes

Select this model for single-channel applications requiring -100 V ringing capabilities. Compare against the LE9541 series if dual-channel density or -145 V support is required. Verify that the 28-pin QFN footprint aligns with existing PCB layout constraints.

Telecom Part Context

This component belongs to the VE950 Series of voice line circuits manufactured by Microsemi. It serves as a functional equivalent to one channel of the LE9540 device but utilizes a smaller 28-pin QFN package. The series is designed to interface directly with Broadcom BCM338x/BCM339x SoCs.

Telecom Replacement Considerations

The LE9541DUQCT is a similar alternative offering pin-to-pin compatibility with the LE9540, though it uses a larger 40-pin package. Consider the LE9551DMQC if -145 V ringing battery support is needed instead of -100 V.

Telecom FAQ

What is the maximum ringing battery voltage supported?

The LE9551CMQC supports up to -100 V ringing battery.

Does the device support wideband audio?

Yes, the high voltage high bandwidth design supports 7-kHz wideband applications.

How is operational control managed?

Operational control and status reports are communicated through a serial interface with reset.