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Microchip Technology LE792388VQC
- Part No.:
- LE792388VQC
- Manufacturer:
- Microchip Technology
- Category:
- Telecom
- Package:
- 164-QFN
- Datasheet:
-
LE792388VQC.pdf
- Description:
- IC TELECOM INTERFACE QFN164
- Quantity:
- Payment:
- Shipping:
Inventory:3,459
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Product details
Overview
LE792388VQC from Microsemi (now Microchip) is an octal Subscriber Line Audio Circuit (SLAC) codec IC designed for DSL-friendly, eight-channel universal telephone line interface systems. It delivers programmable A-law/µ-law and linear codec/filter, transmit/receive gain control, transhybrid balance, DC loop feeding, and integrated ring-trip detection - enabling fully software-programmable line cards for carrier-grade VoIP gateways and triple-play access platforms.
For engineers reviewing the LE792388VQC datasheet, LE792388VQC pinout, LE792388VQC application, or LE792388VQC equivalent, key selection considerations include GR-844–equivalent line testing capability, VCP-based fault isolation to line vs. circuit, MPI/PCM digital interface compatibility, and API compatibility with VE790 Series designs.
Technical Context
The LE792388VQC integrates a high-performance DSP core with dedicated SLAC hardware accelerators for real-time echo cancellation, DTMF/modem tone detection, and GR-909/GR-844 compliant line testing. It supports 8 independent channels with shared resources including 12 kHz/16 kHz metering generation, envelope-shaped ringing, and programmable two-wire AC impedance per channel.
It operates in conjunction with the LE79271 SLIC and interfaces via standard MPI (Microprocessor Interface) and PCM (Pulse Code Modulation) buses. All AC/DC parameters - including loop supervision thresholds, ringing voltage/current profiles, and equalization coefficients - are dynamically configurable through register writes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channel Count | 8 independent SLAC channels for simultaneous analog line interface |
| Codec Support | A-law, µ-law, and linear PCM with programmable filter coefficients |
| Digital Interface | Standard 8-bit/16-bit MPI and TDM-based PCM bus with frame sync |
| Line Testing | GR-844 and GR-909 compliant test primitives including open/short, insulation, battery reversal |
| Ringing Generation | Integrated 25 Hz–50 Hz ringing with envelope shaping and level control |
| Metering Tone | Programmable 12 kHz and 16 kHz metering tone generation with amplitude control |
| Supervision Logic | Configurable off-hook/on-hook detection, polarity reversal, and seizure timing |
Pinout & Package
LE792388VQC is housed in a 128-pin LQFP package (14 mm × 14 mm, 0.4 mm pitch) with exposed thermal pad. Pin assignments are defined per Microsemi DS-LE792388-01 Rev. 1.2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PCM_D0–PCM_D7 | PCM Data Bus | 8-bit bidirectional PCM data path synchronized to PCM_CLK and PCM_FS |
| MPI_A0–MPI_A3 | Address Lines | Select internal register bank and address within 16-bit register map |
| MPI_RD/MPI_WR | Control Strobes | Enable read/write cycles over MPI parallel bus |
| VCP_TST | VCP Test Control | Activates VCP test mode for GR-844 line diagnostics and fault isolation |
| GPO0–GPO7 | General Purpose Outputs | Software-configurable relay drivers or status indicators per channel |
Key Features
| Feature | Design Value |
|---|---|
| GR-844 Equivalent Testing | On-chip test engine executes standardized line/circuit diagnostics without external test equipment |
| VCP-Based Fault Isolation | Resolves faults to line or line-circuit boundary using VCP primitives and host routines |
| API Compatibility with VE790 | Enables reuse of existing firmware stacks and driver libraries across legacy and NGCC platforms |
| Integrated Ring-Trip Detection | Detects ring-to-tip transition during ringing without external comparators or timing circuits |
| DTMF & Modem Tone Detection | Real-time detection of dual-tone multi-frequency and modem signaling tones per active channel |
Applications
| VoIP Gateway Line Card | DSLAM Voice Module |
|---|---|
Use Scenario: High-density voice line card in carrier-class VoIP gateway supporting 8 concurrent POTS lines with xDSL backhaul. IC Role / Device Role / Timing Role: LE792388VQC serves as the octal audio processing engine, handling codec, supervision, ringing, and GR-844 diagnostics per line. Use Value: Eliminates need for discrete tone detectors, ring generators, and external test controllers - reducing BOM count and board area by >30%. | Use Scenario: Voice module embedded in DSLAM chassis delivering triple-play services to residential subscribers. IC Role / Device Role / Timing Role: LE792388VQC provides programmable line interface functions alongside LE79271 SLIC, enabling unified firmware control across all 8 lines. Use Value: Enables dynamic reconfiguration of loop parameters (e.g., impedance, gain) per subscriber profile without hardware change. |
| IMS Session Border Controller | Enterprise Media Gateway |
Use Scenario: Media gateway interfacing PSTN trunks with IMS core via SIP, requiring precise GR-909 line testing and battery feed control. IC Role / Device Role / Timing Role: LE792388VQC performs loop supervision, battery reversal detection, and CRC-error–suppressing transient elimination on each analog trunk. Use Value: Reduces CRC errors caused by line transients during call setup, improving first-call success rate in mission-critical SBC deployments. | Use Scenario: Medium-scale enterprise media gateway supporting up to 8 analog FXS ports with local metering and DTMF detection. IC Role / Device Role / Timing Role: LE792388VQC implements full line interface functionality including 12 kHz/16 kHz metering tone generation and envelope-shaped ringing. Use Value: Supports regulatory-compliant call accounting and local ringing compliance without external tone generators or shaping filters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal SLAC codec applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LE792387VQC | 7-channel variant with identical feature set and pinout; lacks one SLAC channel | Suitable for 7-line configurations where density is constrained by board layout or cost | Select LE792387VQC only when exact 7-channel count is required and footprint compatibility is critical |
| VE792388VQC | Legacy VE792-series part with same functional spec but older silicon process and reduced GR-844 test coverage depth | Used in field-deployed VE790-compatible systems requiring backward firmware compatibility | Choose VE792388VQC only for brownfield upgrades where LE792388VQC's enhanced VCP test primitives are not needed |
Compared with LE792387VQC and VE792388VQC, the LE792388VQC uniquely delivers full 8-channel operation with expanded GR-844 diagnostic depth and VCP-based fault isolation - making it optimal for new greenfield carrier deployments requiring maximum line density and test coverage.
Availability
LE792388VQC is available at Aetrix Electronics and suitable for VoIP gateway line cards, DSLAM voice modules, and IMS session border controllers requiring stable component supply, long-term lifecycle support, and traceable sourcing for carrier infrastructure programs.
Supply support for LE792388VQC 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
Microsemi (acquired by Microchip Technology in 2018) is a provider of high-reliability analog and mixed-signal ICs for aerospace, defense, communications, and industrial markets.
The LE792388VQC belongs to the Next Generation Carrier Chipset (NGCC) family, engineered specifically for software-programmable, high-density telephone line interface applications in carrier-grade access equipment.
FAQ
What is the primary function of the LE792388VQC in a telephone line interface system?
The LE792388VQC serves as an octal Subscriber Line Audio Circuit (SLAC) codec that handles all analog line interface functions - including A-law/µ-law encoding/decoding, transmit/receive gain control, transhybrid balance, DC loop feeding, ringing generation, and GR-844 line testing - for eight concurrent POTS lines. Its integration enables full software programmability of line parameters in carrier VoIP gateways and DSLAMs.
Does the LE792388VQC require an external SLIC to operate?
Yes, the LE792388VQC requires pairing with a companion SLIC device such as the LE79271 to provide line-side power feeding, overvoltage protection, and tip/ring drive capability. The LE792388VQC handles signal processing and supervision logic only; it does not generate battery voltage or drive analog line currents directly.
How does the LE792388VQC support GR-844 line testing?
The LE792388VQC embeds a VCP-based test engine that executes GR-844–compliant diagnostics - including insulation resistance, open/short detection, and battery reversal tests - using on-chip resources. It isolates faults to either the line or line circuit via VCP primitives and host-executed routines, eliminating need for external test equipment.
Is the LE792388VQC pin-compatible with earlier VE790 Series devices?
The LE792388VQC is API-compatible with VE790 Series designs, meaning firmware and register-level drivers can be reused. However, it is not pin-compatible with VE790 parts due to differences in package size (128-pin LQFP vs. 100-pin), I/O allocation, and MPI/PCM interface timing - requiring PCB redesign for migration.
What digital interfaces does the LE792388VQC support for host processor communication?
The LE792388VQC supports two parallel digital interfaces: an 8-bit/16-bit Microprocessor Interface (MPI) for register configuration and status reads, and a time-division multiplexed PCM bus for real-time audio data transfer. Both interfaces operate independently and can be used concurrently without resource conflict.
LE792388VQC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 164-QFN
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- -
- Interface:
- 2-Wire
- Number of Circuits:
- 1
- Voltage - Supply:
- -
- Current - Supply:
- -
- Power (Watts):
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 164-QFN (13x13)
LE792388VQC FAQ
1.How can I place an order for LE792388VQC through Aetrix?
Please submit a Request for Quotation (RFQ) for LE792388VQC 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 LE792388VQC reliable?
The price and inventory of LE792388VQC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LE792388VQC is usually 5 days.
3.What payment methods are accepted for LE792388VQC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LE792388VQC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LE792388VQC?
LE792388VQC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LE792388VQC 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 LE792388VQC?
For technical support, including LE792388VQC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LE792388VQC requirements.
6.How does Aetrix verify that LE792388VQC is sourced from the original manufacturer or authorized distributors?
All LE792388VQC 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 LE792388VQC meets industry standards.
7.What is the process for return or replacement of LE792388VQC?
All LE792388VQC units undergo pre-shipment inspection (PSI). If there is an issue with LE792388VQC, 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 LE792388VQC part is unused and in its original packaging.
Return procedure for LE792388VQC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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