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Microchip Technology LE79Q2284MVC
- Part No.:
- LE79Q2284MVC
- Manufacturer:
- Microchip Technology
- Category:
- Telecom
- Package:
- 80-LQFP
- Datasheet:
-
LE79Q2284MVC.pdf
- Description:
- IC TELECOM INTERFACE 80LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,645
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Product details
Overview
LE79Q2284MVC from Zarlink Semiconductor (acquired by Microsemi, now part of Microchip) is a quad-channel intelligent subscriber line audio-processing circuit (ISLAC™) designed for BORSCHT implementation in voice-over-x line cards. It provides full programmable A-law/µ-law/linear codec/filter, DC loop feeding, transhybrid balance, ring-trip detection, and tone generation (DTMF/FSK/metering) across four channels, operating at +3.3 V with 80-pin LQFP packaging.
For engineers reviewing the LE79Q2284MVC datasheet, LE79Q2284MVC pinout, LE79Q2284MVC application, or LE79Q2284MVC equivalent, this device serves as the DSP and control core in dual-chip ISLAC+ISLIC voice interface solutions for VoIP IADs, cable telephony NIUs, FTTH gateways, and intelligent PBX systems requiring software-configurable line supervision and diagnostics.
Technical Context
The LE79Q2284MVC integrates a high-performance digital signal processor with four independent analog front-ends to manage all voice channel functions-codec, filtering, gain control, impedance matching, and hybrid balancing-via microprocessor or GCI/PCM interfaces. It supports selectable PCM/MPI or GCI digital backplanes with master clock flexibility from 512 kHz to 8.192 MHz.
It interfaces exclusively with VE790-series ISLIC devices via tri-level LD1–LD4 control signals and analog sense inputs (VILG/VIMT/VSAB/VHL), enabling full software-defined BORSCHT operation-including programmable off-hook debounce, ground-key detection, adaptive transhybrid balance, and integrated line testing per GR-909/GR-844 standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 4 independent subscriber line processing channels |
| Supply Voltage | +3.3 V DC for analog (VCCA1–VCCA4) and digital (VCCD) sections |
| Digital Interface | Selectable PCM/MPI or GCI; supports 512 kHz–8.192 MHz master clock |
| Codec Format | Programmable 8-bit A-law/µ-law or 16-bit linear two's-complement PCM |
| Ringing Support | Integrated ring-trip detection with automatic/manual mode; supports internal or external ringing |
| Tone Generation | DTMF, FSK, random noise, arbitrary tone, and 12/16 kHz metering with envelope shaping |
| Line Diagnostics | Built-in leakage, capacitance, loop resistance, and echo gain/noise/diagnostic tests per GR-909/GR-844 |
Pinout & Package
LE79Q2284MVC is housed in an 80-pin Low-Profile Quad Flat Pack (LQFP), green RoHS-compliant package, with exposed pad thermal design. Pin functions include dedicated analog sense inputs (VILG1–VILG4, VIMT1–VIMT4), control outputs (LD1–LD4, P1–P3), digital interface pins (DRA/DD, DRB, DXA/DU, DXB, FS/DCL, PCLK/FS), and general-purpose I/O (I/O1–I/O4).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LD1–LD4 | Tri-level control output | Selects destination (mode latch vs. relay latch) for P1–P3 signals driving VE790 ISLIC devices |
| VILG1–VILG4 | Analog longitudinal current input | Senses ISLIC metallic-to-ground current; tied to VREF if channel unused |
| VIMT1–VIMT4 | Analog metallic current input | Senses ISLIC tip-to-ring current; tied to VREF if channel unused |
| DIN/S1 & DOUT | Serial control I/O | Supports bidirectional configuration/data transfer in PCM mode; DOUT only on 80-pin LQFP |
| I/O1–I/O4 | Configurable GPIO | Per-channel logic I/O for external control or monitoring; programmable direction and data access |
| GS11–GS14, GS21–GS24 | Gain select nodes | Switched tie points to VREF for scaling VILG/VIMT inputs; available only on 80-pin LQFP |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable BORSCHT | Fully programmable DC feed, ringing, supervision, hybrid balance, and test functions per channel via register interface |
| Adaptive transhybrid balance | Continuous or "adapt-and-freeze" algorithm for real-time echo cancellation without external components |
| Integrated line diagnostics | On-chip measurement of leakage resistance, line capacitance, loop resistance, and echo performance per GR-909/GR-844 |
| Caller ID & metering support | Hardware-accelerated CID tone generation and programmable 12/16 kHz metering with envelope shaping |
| Multi-standard compliance | Exceeds LSSGR, ITU-T, and Telcordia GR-909/GR-844 requirements for central office and remote line card applications |
Applications
| Voice over IP Integrated Access Device (IAD) | Cable Telephony Network Interface Unit (NIU) |
|---|---|
Use Scenario: Residential gateway aggregating PSTN lines over broadband using SIP/MEGACO protocols. IC Role / Device Role / Timing Role: LE79Q2284MVC performs full BORSCHT processing and signaling for four analog lines while interfacing with VE790 ISLICs for high-voltage line driving. Use Value: Enables single-hardware platform supporting global line parameters (ring frequency, feed current, impedance) via software configuration-reducing SKU count and certification effort. | Use Scenario: Cable operator-deployed NIU providing POTS service alongside DOCSIS data. IC Role / Device Role / Timing Role: LE79Q2284MVC handles off-hook detection, ring-trip, DTMF decoding, and 16 kHz metering generation synchronized to cable headend timing. Use Value: Meets North American TR-41.3 and SCTE-17 requirements for metering accuracy and supervisory response time without external timing ICs. |
| Fiber-to-the-Home (FTTH) Terminal | Intelligent PBX Line Card |
Use Scenario: GPON ONT delivering analog voice service with battery backup and remote diagnostics. IC Role / Device Role / Timing Role: LE79Q2284MVC executes on-hook transmission, polarity reversal, and built-in line-test routines during maintenance windows. Use Value: Eliminates need for field technician dispatch by enabling automated fault isolation (e.g., open line vs. shorted ringer) via embedded diagnostic registers. | Use Scenario: Enterprise PBX supporting both loop-start and ground-start signaling with caller ID display. IC Role / Device Role / Timing Role: LE79Q2284MVC manages dual-signaling mode selection, CID tone generation, and programmable ground-key filter thresholds per line. Use Value: Supports mixed-line environments (e.g., analog fax + digital phones) with independent per-channel configuration-no hardware redesign required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-channel voice line interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZL38004 | Single-chip VoIP processor with integrated ARM core; lacks native ISLIC interface and analog sense inputs | Targets standalone VoIP endpoints; not compatible with VE790-series ISLIC co-design | Choose ZL38004 only for self-contained SIP phone designs requiring embedded firmware-not for carrier-grade line cards needing external SLIC control. |
| SLIC450 | Quad analog-front-end-only device; no DSP, no codec, no BORSCHT logic-requires external controller | Used in custom ASIC-based line cards where DSP is implemented elsewhere | SLIC450 requires full external microcontroller and firmware stack; LE79Q2284MVC includes integrated DSP and WinSLAC™-compatible configuration tools. |
Compared with ZL38004 and SLIC450, LE79Q2284MVC uniquely delivers complete, software-programmable BORSCHT functionality in a dual-chip architecture optimized for carrier-class reliability, regulatory compliance, and rapid multi-country deployment-without requiring embedded software development or external analog interface components.
Availability
LE79Q2284MVC is available at Aetrix Electronics and suitable for Voice over IP IADs, cable telephony NIUs, and FTTH terminals requiring stable component supply, long-lifecycle support, and traceable sourcing for carrier-grade deployments.
Supply support for LE79Q2284MVC includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Zarlink Semiconductor developed high-reliability communications ICs for carrier infrastructure before its acquisition by Microsemi in 2011; Microsemi was later acquired by Microchip Technology in 2018.
The LE79Q2284MVC belongs to the VE790-series intelligent line interface chipset, designed specifically for software-configurable, multi-standard telephone line cards targeting VoIP, cable, fiber, and wireless local loop applications.
FAQ
What is the primary function of the LE79Q2284MVC in a voice line card?
The LE79Q2284MVC serves as the digital signal processor and control core in a dual-chip voice interface solution, performing all BORSCHT functions-including codec, filtering, DC feed control, ringing generation, loop supervision, and line diagnostics-for four subscriber lines. It operates exclusively with VE790-series ISLIC devices to form a complete, software-programmable line card.
Does the LE79Q2284MVC support both PCM and GCI digital interfaces?
Yes, the LE79Q2284MVC supports selectable PCM/MPI or GCI digital backplane interfaces. PCM mode uses FS/DCL and PCLK/FS for frame sync and clocking, while GCI mode uses DCL and FS signals at 2/4 MHz and 8 kHz respectively. Interface selection is determined by signal presence and configuration register settings-not pin strapping.
How does the LE79Q2284MVC handle ring-trip detection?
The LE79Q2284MVC implements integrated ring-trip detection using analog inputs from the VE790 ISLIC device (via VILG/VIMT/VSAB). It supports both automatic and manual ring-trip modes, with programmable thresholds and filtering. Detection status is reported via interrupt (INT pin) and accessible through dedicated signaling registers for host processor polling.
Can the LE79Q2284MVC operate with different international ringing standards?
Yes, the LE79Q2284MVC enables full software configuration of ringing waveform, frequency, amplitude, and cadence to meet regional requirements-including North American (20 Hz), European (25 Hz), and Japanese (16.7 Hz) standards-when paired with VE790-series ISLICs capable of generating balanced ringing voltages.
What tools are available to configure the LE79Q2284MVC for specific line parameters?
Zarlink provided WinSLAC™ PC software free of charge to calculate filter coefficients, DC-feed parameters, supervision thresholds, and equalization settings based on system requirements. Users input target specifications (e.g., loop length, battery voltage, impedance), and WinSLAC generates register values and predicts performance metrics like echo return loss and distortion.
LE79Q2284MVC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 80-LQFP
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- ISLAC DEVICE
- Interface:
- PCM
- Number of Circuits:
- 4
- Voltage - Supply:
- 3.3V
- Current - Supply:
- -
- Power (Watts):
- -
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 80-LQFP (12x12)
LE79Q2284MVC FAQ
1.How can I place an order for LE79Q2284MVC through Aetrix?
Please submit a Request for Quotation (RFQ) for LE79Q2284MVC on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LE79Q2284MVC reliable?
The price and inventory of LE79Q2284MVC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LE79Q2284MVC is usually 5 days.
3.What payment methods are accepted for LE79Q2284MVC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LE79Q2284MVC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LE79Q2284MVC?
LE79Q2284MVC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LE79Q2284MVC order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LE79Q2284MVC?
For technical support, including LE79Q2284MVC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LE79Q2284MVC requirements.
6.How does Aetrix verify that LE79Q2284MVC is sourced from the original manufacturer or authorized distributors?
All LE79Q2284MVC products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LE79Q2284MVC meets industry standards.
7.What is the process for return or replacement of LE79Q2284MVC?
All LE79Q2284MVC units undergo pre-shipment inspection (PSI). If there is an issue with LE79Q2284MVC, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LE79Q2284MVC part is unused and in its original packaging.
Return procedure for LE79Q2284MVC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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