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Microchip Technology LE58QL021FJC
- Part No.:
- LE58QL021FJC
- Manufacturer:
- Microchip Technology
- Category:
- Telecom
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
LE58QL021FJC.pdf
- Description:
- IC TELECOM INTERFACE 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,236
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Product details
Overview
LE58QL021FJC from Zarlink Semiconductor is a quad low-voltage subscriber line audio-processing circuit (QLSLAC™) designed for telecom line card codec/filter and 2-wire/4-wire conversion. It integrates four independent channels, supports A-law/µ-law/linear coding, operates on 3.3 V CMOS with 5-V tolerant digital inputs, and delivers programmable transhybrid balance, impedance scaling, and equalization for BORSCHT implementation with SLIC devices.
For engineers reviewing the LE58QL021FJC datasheet, LE58QL021FJC pinout, LE58QL021FJC application, or LE58QL021FJC equivalent, key selection criteria include single-PCM-highway configuration, 44-pin PLCC package, software-coefficient compatibility with Le79Q021, real-time data register with interrupt, and support for V.90 modem channel bandwidth.
Technical Context
The LE58QL021FJC implements four independent signal processing channels using digital filters clocked by MCLK or PCLK (1.536–8.192 MHz), enabling full software control of transmit/receive gains, time slot assignment, chopper clock (256/293 kHz), and SLIC interface I/O direction. Its architecture includes a dedicated microprocessor interface (MPI), time slot assigner (TSA), and analog impedance scaling network (AISN).
It supports dual-mode PCM operation (8-bit companded or 16-bit linear), robbed-bit signaling compatibility, broadcast programming via Channel Enable register (4Ah), and real-time monitoring through interrupt-capable status registers. All filter coefficients-including GX, GR, Z, B1, X, R, and ground key-are user-programmable via MPI commands.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | Four independent audio-processing channels for simultaneous line-card subscriber handling. |
| PCM Interface | Single PCM highway supporting up to 128 channels at 8.192 MHz PCLK; configurable time slot and transmit clock edge. |
| Coding Format | A-law, µ-law, or linear PCM; 8-bit companded (with optional 8-bit signaling byte) or 16-bit linear per sample. |
| Master Clock Range | 1.536, 1.544, 2.048, 3.072, 3.088, 4.096, 6.144, 6.176, or 8.192 MHz derived from MCLK or PCLK. |
| Power Supply | 3.3 V CMOS core with 5-V tolerant digital I/O pins; separate analog (VCCA) and digital (VCCD) supplies. |
| Chopper Clock | 256 kHz or 293 kHz output for Legerity SLIC devices with switching regulators. |
| Operating Temperature | Guaranteed over industrial range –40°C to +85°C per datasheet Operating Ranges section. |
Pinout & Package
LE58QL021FJC is housed in a 44-pin Plastic Leaded Chip Carrier (PLCC) package with gull-wing leads, RoHS-compliant green finish, and tube packaging. Pin layout follows standard PLCC 44 geometry with corner index mark and pin 1 located at top-left when notch faces upward.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1–VIN4 | Analog input (channel 1–4) | Differential analog voice input from SLIC device; connects to 2-wire line interface. |
| VOUT1–VOUT4 | Analog output (channel 1–4) | Differential analog voice output to SLIC device; drives hybrid circuitry. |
| CD11–CD14, CD21–CD24 | SLIC control outputs | Digital control lines to SLIC devices for mode selection, LED/optocoupler drive, and supervision. |
| C31–C54 | SLIC I/O bidirectional | Configurable digital I/O for SLIC supervision, status readback, and debounced input support. |
| DIO, DCLK, CS, RST, FS, PCLK, MCLK/E1 | MPI and clock interface | Serial microprocessor interface (3-wire) with frame sync, programmable clock inputs, and hardware reset. |
| INT, DXA, DXB, DRA, DRB, TSCA, TSCB | Interrupt & TSA signals | Open-drain or TTL interrupt output; dual PCM highway data/control paths with time slot assignment control. |
| VREF, AGND, DGND, VCCA, VCCD | Analog/digital supply & reference | Separate analog/digital grounds and supplies ensure noise isolation; internal reference voltage for ADC/DAC. |
Key Features
| Feature | Design Value |
|---|---|
| Software programmability | Full channel-by-channel configuration of impedance, gain, equalization, clock edge, and time slot via MPI commands (e.g., 40h–45h, 50h–55h). |
| Transhybrid balancing | Digital FIR/IIR filtering enables precise echo cancellation across all four channels without external components. |
| Real-time data register | Provides instantaneous channel status (e.g., overload, clipping, supervision flags) with interrupt generation on change. |
| SLIC interface support | Five programmable I/O per channel for direct digital control and status monitoring of Legerity SLIC devices. |
| Broadcast programming mode | Simultaneous configuration of all enabled channels via EC register (4Ah), reducing initialization overhead in multi-channel systems. |
Applications
| VoIP Line Cards | Digital Loop Carrier (DLC) |
|---|---|
Use Scenario: High-density central office line cards serving analog POTS subscribers over IP backhaul. IC Role / Device Role / Timing Role: Performs codec, filter, and 2-wire/4-wire conversion for four simultaneous voice channels; interfaces directly with SLIC and DSP subsystems. Use Value: Enables cost-effective, software-configurable BORSCHT implementation with guaranteed V.90 modem bandwidth and <15 dB attenuation distortion. | Use Scenario: Remote terminal units aggregating multiple subscriber lines onto T1/E1 trunks. IC Role / Device Role / Timing Role: Audio-processing front-end for digital loop carrier systems; provides PCM framing, robbed-bit signaling compatibility, and SLIC supervision. Use Value: Supports E1 multiplex operation and real-time status monitoring via interrupt-driven RTD register, improving system diagnostics and uptime. |
| Enterprise PBX Systems | DSLAM Voice Modules |
Use Scenario: Modular voice gateway cards in enterprise private branch exchanges requiring flexible line-side interface. IC Role / Device Role / Timing Role: Quad-channel audio processor with A-law/µ-law selectable coding and programmable PCM time slots for trunk integration. Use Value: Eliminates need for discrete codecs and analog filters; reduces BOM count while maintaining >60 dB crosstalk rejection between channels. | Use Scenario: Integrated voice-over-DSL modules providing POTS service alongside broadband data. IC Role / Device Role / Timing Role: Subscriber line audio interface co-located with DSL PHY; shares master clock resources and supports mixed-state impedance scaling. Use Value: Delivers mixed analog/digital impedance scaling and chopper clock synchronization with SLIC switching regulators, minimizing power supply noise coupling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-line audio-processing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LE58QL02FJC | Dual PCM highway; four SLIC I/O per channel; no chopper clock output. | Suitable for systems requiring independent transmit/receive PCM buses and higher channel isolation. | Select LE58QL02FJC only if dual-PCM architecture and absence of chopper clock are design requirements. |
| LE58QL031DJC | 32-pin PLCC; single PCM highway; two SLIC I/O per channel; no chopper clock. | Targeted at space-constrained, lower-I/O-count line card designs with reduced supervision needs. | Choose LE58QL031DJC when footprint reduction and simplified SLIC interface outweigh need for five I/O lines and chopper clock. |
Compared with LE58QL02FJC and LE58QL031DJC, LE58QL021FJC uniquely combines single-PCM simplicity, five-programmable-SLIC-I/O capability, and integrated 256/293 kHz chopper clock-making it optimal for modern SLIC-coupled VoIP line cards requiring robust supervision and regulator synchronization.
Availability
LE58QL021FJC is available at Aetrix Electronics and suitable for VoIP line cards, digital loop carrier systems, enterprise PBX gateways, and DSLAM voice modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.
Supply support for LE58QL021FJC 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 was a fabless semiconductor company specializing in timing, voice, and RF solutions for communications infrastructure before its acquisition by Microsemi in 2011.
The LE58QL021FJC belongs to the QLSLAC™ product line, engineered specifically for high-density, software-defined telecom line cards needing integrated quad-channel audio processing, SLIC interfacing, and BORSCHT function support.
FAQ
What is the primary function of the LE58QL021FJC in telecom line card design?
The LE58QL021FJC serves as a quad-channel subscriber line audio-processing circuit that performs codec, digital filtering, 2-wire/4-wire conversion, and SLIC interface control. It replaces discrete analog and digital components in BORSCHT implementations, enabling full software configuration of gain, impedance, equalization, and timing-critical for scalable, field-upgradable line cards.
Does the LE58QL021FJC support both A-law and µ-law companding?
Yes, the LE58QL021FJC supports both A-law and µ-law 8-bit companded PCM coding, as well as 16-bit linear PCM. Coding format is selected via software configuration of the chip configuration register (Command 46h/47h), allowing seamless interoperability with regional telephony standards and legacy infrastructure.
How many SLIC devices can be controlled by a single LE58QL021FJC?
A single LE58QL021FJC is designed to interface with four SLIC devices-one per channel-using dedicated control (CD1x/CD2x) and bidirectional I/O (C3x–C5x) pins. Each channel provides five programmable digital I/O lines, enabling comprehensive supervision, LED control, and optocoupler driving without external logic.
What clock frequencies does the LE58QL021FJC accept for master clock derivation?
The LE58QL021FJC accepts master clock (MCLK) or PCM clock (PCLK) inputs at 1.536, 1.544, 2.048, 3.072, 3.088, 4.096, 6.144, 6.176, or 8.192 MHz. The device internally derives all required sampling and processing clocks from these sources, ensuring precise timing alignment for voice-band filtering and V.90 modem compliance.
Is the LE58QL021FJC pin-compatible with earlier QSLAC™ devices like the Le79Q021?
No, the LE58QL021FJC is not pin-compatible with Le79Q021 due to differences in package size (44-pin PLCC vs. 48-pin TQFP), I/O count, and functional allocation (e.g., C5x pins added for SLIC supervision). However, it is software and coefficient compatible-register maps, command structure, and filter coefficient formats remain identical for seamless firmware migration.
LE58QL021FJC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 44-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Subscriber Line Interface Concept (SLIC)
- 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:
- 44-PLCC (16.59x16.59)
LE58QL021FJC FAQ
1.How can I place an order for LE58QL021FJC through Aetrix?
Please submit a Request for Quotation (RFQ) for LE58QL021FJC 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 LE58QL021FJC reliable?
The price and inventory of LE58QL021FJC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LE58QL021FJC is usually 5 days.
3.What payment methods are accepted for LE58QL021FJC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LE58QL021FJC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LE58QL021FJC?
LE58QL021FJC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LE58QL021FJC 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 LE58QL021FJC?
For technical support, including LE58QL021FJC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LE58QL021FJC requirements.
6.How does Aetrix verify that LE58QL021FJC is sourced from the original manufacturer or authorized distributors?
All LE58QL021FJC 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 LE58QL021FJC meets industry standards.
7.What is the process for return or replacement of LE58QL021FJC?
All LE58QL021FJC units undergo pre-shipment inspection (PSI). If there is an issue with LE58QL021FJC, 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 LE58QL021FJC part is unused and in its original packaging.
Return procedure for LE58QL021FJC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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