LE79Q2284MVC

Telecom Overview

The LE79Q2284MVC is a Quad Intelligent Subscriber Line Audio-processing Circuit (ISLAC) from the VE790 series, manufactured by Microchip Technology. It operates in an 80-pin LQFP package and provides four-channel universal telephone line interface capabilities when paired with a VE790 series ISLIC device. The device supports +3.3 V DC operation and features selectable PCM/MPI or GCI digital interfaces, accommodating master clock frequencies ranging from 512 kHz to 8.192 MHz. It includes four general-purpose I/O pins and integrates high-performance DSP for programmable control of BORSCHT functions, codecs, filters, and line testing.

Telecom Feature Summary

• High-performance digital signal processor enables programmable control over A-law/µ-law and linear codec/filter functions, transmit/receive gain, two-wire AC impedance, transhybrid balance, and equalization.
• Integrated DC loop feeding, smooth or abrupt polarity reversal, loop supervision, off-hook debounce, ground-key detection, and ring-trip filtering capabilities.
• Supports internal ringing generation with integrated ring-trip detection, adaptive hybrid balance, and comprehensive line and circuit testing meeting GR-909 and GR-844 requirements.
• Selectable PCM/MPI or GCI digital interfaces support most available master clock frequencies from 512 kHz to 8.192 MHz.

Telecom Applications

• Voice over IP/DSL Integrated Access Devices (IAD), Smart Residential Gateways (SRG), Home Gateway/Router
• Cable Telephony Network Interface Units (NIU), Set-Top Box, Home Side Box, Cable Modem, Cable PC
• Fiber in the Loop (FITL), Fiber to the Home (FTTH)
• Wireless Local Loop, Intelligent PBX, DLC-MUX, Central Office

Telecom Procurement Notes

Verify the specific ordering suffix 'MVC' corresponds to the 80-pin LQFP package configuration as documented in the official datasheet. Confirm that the green package meets RoHS Directive 2002/95/EC requirements if environmental compliance is necessary for the target application. Ensure compatibility with the required packing method, noting that tape and reel options require a 'T' suffix addition to the part number.

Telecom Selection Notes

Select this component when designing a single, low-cost, high-performance, fully software-programmable line interface for multiple country applications. It is suitable for designs requiring complete software configurability for worldwide line card requirements via microprocessor or GCI interfaces. Consider pairing with a VE790 series ISLIC device to implement the full four-channel subscriber line interface solution.

Telecom Part Context

The LE79Q2284MVC belongs to the Le79228 Quad ISLAC device family within the VE790 series voice chip sets. Originally developed by Zarlink Semiconductor, which acquired Legerity Holdings products in August 2007, the technology was subsequently integrated into Microchip Technology's portfolio. This device serves as the low-voltage CMOS IC counterpart to the high-voltage bipolar VE790 series ISLIC devices.

Telecom Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should consult the official datasheet for related literature references, such as the Le79232, Le79242, or Le79252 Dual ISLIC devices, to ensure system-level compatibility rather than direct pin-for-pin substitution.

Telecom FAQ

What digital interfaces does the LE79Q2284MVC support?

The device supports selectable PCM/MPI or GCI digital interfaces and accommodates most available master clock frequencies ranging from 512 kHz to 8.192 MHz.

How does the LE79Q2284MVC handle ringing generation?

It features internal ringing generation and integrated ring-trip detection, supporting both automatic and manual ring-trip modes, as well as external ringing with on-chip ring-trip circuits.

What line testing capabilities are included?

The device includes built-in test tools for monitoring AC and DC line conditions, measuring longitudinal and metallic resistance and capacitance, and performing self-tests for echo gain, distortion, and noise, meeting GR-909 and GR-844 requirements.