LE9551DMQCT

Telecom Overview

The LE9551DMQCT is a single-channel ringing Subscriber Line Interface Circuit (SLIC) from the VE900 series, manufactured by Microsemi. It provides battery feed, ringing, and supervision for voice loops in short-loop cable applications. The device operates with a –145 V ringing battery supply and features high voltage and high bandwidth design supporting 7-kHz wideband applications. It interfaces via a serial interface with reset and supports GR909 testing. Key electrical parameters include a power consumption of up to 359 mW in ring state at –145 V, longitudinal-to-metallic balance of 52 dB, and PSRR of 40 dB.

Telecom Feature Summary

• Optimized for integration with Broadcom BCM338x/BCM339x SoCs in residential gateways
• Supports 7-kHz wideband applications with high voltage and high bandwidth design
• Includes thermal shutdown protection with hysteresis and test load switch capabilities
• Detects loop start, ring trip, and ring-ground conditions using two thresholds

Telecom Applications

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

Telecom Procurement Notes

Verify component authenticity through authorized channels as the part may be subject to obsolescence or lifecycle changes. Confirm package integrity and RoHS compliance status prior to procurement. Ensure compatibility with existing system designs regarding pinout and serial interface requirements.

Telecom Selection Notes

Select this component for single-channel applications requiring a compact 4x5 28-pin QFN footprint. It serves as an equivalent to one channel of the LE9540 but in a smaller package suitable for space-constrained designs. Ensure the design accommodates the required serial interface connections and reset functionality.

Telecom Part Context

This device belongs to the VE900 series of ringing SLICs, designed specifically for short-loop cable applications. It is functionally equivalent to Channel 1 of the LE9540 but utilizes a distinct 28-pin QFN package optimized for single-channel use cases.

Telecom Replacement Considerations

The LE9541DUQCT is a similar alternative offering dual-channel capability in a larger 40-pin QFN package. Consider this option if dual-channel support is required or if the original 28-pin footprint is not strictly mandated.

Telecom FAQ

What is the maximum ringing battery voltage supported by the LE9551DMQCT?

The LE9551DMQCT supports up to –145 V ringing battery voltage.

Does the LE9551DMQCT support wideband audio applications?

Yes, it supports 7-kHz wideband applications due to its high voltage and high bandwidth design.

How is operational control and status reported for this device?

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