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Microchip Technology LE58QL021FJCT
- Part No.:
- LE58QL021FJCT
- Manufacturer:
- Microchip Technology
- Category:
- Telecom
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
LE58QL021FJCT.pdf
- Description:
- IC TELECOM INTERFACE 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,724
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Product details
Overview
LE58QL021FJCT 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 from 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 LE58QL021FJCT datasheet, LE58QL021FJCT pinout, LE58QL021FJCT application, or LE58QL021FJCT equivalent, this device is selected for programmable PCM-based telephony line cards requiring software-configurable gain, timing, and supervision across up to 128 time slots per single PCM highway at PCLK up to 8.192 MHz.
Technical Context
The LE58QL021FJCT implements four independent signal processing channels with fully programmable digital filters (GX, GR, Z, B1–B2, X, R) for transmit/receive path gain, frequency response correction, and transhybrid balancing. Its Time Slot Assigner (TSA) enables user-defined time slot mapping and clock edge selection on a single PCM highway.
It features a standard serial microprocessor interface (MPI) with CS/DCLK/DIO/RST/FS/INT signals, supports chopper clock generation (256 kHz or 293 kHz) for Legerity SLIC devices, and includes real-time data register with interrupt output for system monitoring and supervision.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | Four independent, software-programmable audio processing channels |
| PCM Interface | Single PCM highway supporting 8-bit A-law/µ-law or 16-bit linear coding; up to 128 channels at 8.192 MHz PCLK |
| Supply Voltage | 3.3 V core (VCCD/VCCA); digital I/O pins tolerate 5 V |
| Coding Standards | ITU-T G.711 A-law and µ-law companding, plus linear PCM |
| Filter Programmability | Full coefficient control of GX (transmit), GR (receive), Z (impedance), B1/B2 (IIR), X/R (equalization) filters via MPI commands |
| Chopper Clock | Internally generated 256 kHz or 293 kHz clock for SLIC switching regulator synchronization |
| Operating Temperature | –40°C to +85°C industrial range, validated per datasheet operating ranges |
Pinout & Package
LE58QL021FJCT is housed in a 44-pin PLCC (Plastic Leaded Chip Carrier) package with 16.5 mm × 16.5 mm body size and 1.27 mm pitch, RoHS-compliant green finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1–VIN4 | Analog input (channel 1–4) | Differential analog receive path inputs from SLIC devices |
| VOUT1–VOUT4 | Analog output (channel 1–4) | Differential analog transmit path outputs to SLIC devices |
| CD11–CD14, CD21–CD24 | SLIC control data outputs | Two-bit per-channel digital control lines to configure SLIC device modes and LEDs |
| C31–C34, C41–C44, C51–C54 | SLIC supervision inputs | Three-bit per-channel status inputs (e.g., loop closure, battery, ground key) |
| DRA, DRB | PCM receive data (A/B highways) | Serial PCM data input from external time-division multiplexed bus (single highway active in LE58QL021) |
| DXA, DXB | PCM transmit data (A/B highways) | Serial PCM data output to external bus (only DXA used in single-highway LE58QL021) |
| TSCA, TSCB | Time slot clock (A/B) | Programmable clock edges for transmit/receive time slot alignment; TSCB unused in single-highway mode |
| PCLK | PCM frame clock | Primary timing reference for PCM data transfer; supports 1.536–8.192 MHz |
| MCLK/E1 | Master clock or E1 interface | Source for internal master clock generation; configurable as MCLK input or E1 framing input |
| CS, DCLK, DIO, RST, FS, INT | Microprocessor interface | 4-wire SPI-compatible serial control bus with frame sync and open-drain interrupt output |
| VREF | Analog reference voltage | Internal 1.25 V reference for ADC/DAC biasing and calibration |
| VCCA, VCCD, AGND, DGND | Power and ground | Separate analog/digital supplies and grounds for noise isolation and SNR optimization |
Key Features
| Feature | Design Value |
|---|---|
| Software & coefficient compatibility | Fully compatible with Le79Q02/021/031 QSLAC™ devices-enables reuse of existing firmware and filter coefficient libraries |
| Programmable impedance scaling | Real-time adjustment of SLIC input impedance via AISN register (Command 50/51h) to match varying line conditions |
| Transhybrid balance control | Configurable digital echo cancellation using Z-filter coefficients to suppress near-end echo in 2-wire to 4-wire conversion |
| Real-Time Data Register | Interrupt-capable status register (Command 4D/4Fh) reporting channel activity, supervision states, and error flags without CPU polling |
| Supervision signaling support | Robbed-bit signaling compatibility and optional PCM highway supervision byte for battery, loop, and ground key detection |
Applications
| DSLAM Line Card | VoIP Gateway |
|---|---|
Use Scenario: High-density DSL access multiplexer with integrated voice line cards serving POTS subscribers. IC Role / Device Role / Timing Role: Quad-channel codec/filter performing BORSCHT functions alongside four SLICs; synchronizes to PCLK at 8.192 MHz for 128-channel TDM aggregation. Use Value: Enables full software reconfiguration of gain, impedance, and echo cancellation per line-reducing hardware variants and field calibration effort. | Use Scenario: Enterprise VoIP gateway bridging analog PSTN lines to SIP-based IP networks. IC Role / Device Role / Timing Role: Audio-processing front-end converting analog voice to A-law PCM for DSP-based transcoding and packetization. Use Value: Single-chip integration of four codecs eliminates discrete filter components and reduces board area by >40% vs. dual-channel alternatives. |
| Remote Terminal Unit | Emergency Call System |
Use Scenario: Rural telecom remote terminal housing 16–32 analog line interfaces in temperature-hardened enclosure. IC Role / Device Role / Timing Role: Centralized audio processor handling all line-side analog-to-digital/digital-to-analog conversion and supervision under -40°C to +85°C operation. Use Value: Industrial-grade thermal performance and built-in chopper clock ensure reliable SLIC regulation and metering signal discrimination per ITU-T K.21. | Use Scenario: Public safety PSAP (Public Safety Answering Point) analog trunk interface supporting priority call routing and battery backup. IC Role / Device Role / Timing Role: Supervision-aware codec detecting ground key, loop disconnect, and battery reversal events via C3/C4/C5 inputs and real-time interrupt reporting. Use Value: Hardware-accelerated supervision state capture ensures <10 ms event latency-critical for E911 call validation and alarm triggering. |
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 |
|---|---|---|---|
| LE58QL02FJCT | Dual PCM highway support; four SLIC I/O lines per channel; no C5x supervision inputs | Suitable for systems requiring independent transmit/receive PCM buses (e.g., legacy TDM switches) | Select when dual-highway timing isolation or broadcast-mode SLIC control is required |
| LE58QL031DJCT | 32-pin PLCC; single PCM highway; only two SLIC I/O lines per channel; no C5x inputs | Targeted at space-constrained designs with reduced supervision requirements (e.g., basic FXS modules) | Select when board area is critical and full five-bit supervision per channel is unnecessary |
Compared with LE58QL02FJCT, LE58QL021FJCT trades dual-highway flexibility for expanded five-bit per-channel supervision (C51–C54), while LE58QL031DJCT further reduces pin count and supervision depth to fit compact 32-pin layouts-making LE58QL021FJCT the optimal balance for new single-highway line cards needing full SLIC supervision and software configurability.
Availability
LE58QL021FJCT is available at Aetrix Electronics and suitable for DSLAM line cards, VoIP gateways, remote terminal units, and emergency call systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.
Supply support for LE58QL021FJCT 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 provider of high-performance analog and mixed-signal ICs for communications infrastructure, acquired by Microsemi in 2011 and later integrated into Microchip Technology.
The QLSLAC™ product line-including LE58QL021FJCT-was engineered specifically for carrier-grade telephony line cards, delivering software-defined BORSCHT functionality with minimal external components and robust SLIC interoperability.
FAQ
What is the primary function of the LE58QL021FJCT in a telecom line card?
The LE58QL021FJCT serves as a quad-channel audio-processing IC that performs codec, digital filtering, 2-wire/4-wire conversion, and SLIC interface control for BORSCHT implementation. It digitizes analog voice signals into A-law/µ-law PCM and reconstructs them, while enabling software configuration of gain, impedance, echo cancellation, and supervision-all within a single 44-pin PLCC package.
Does the LE58QL021FJCT support both A-law and µ-law companding?
Yes, the LE58QL021FJCT natively supports both ITU-T G.711 A-law and µ-law companding formats, selectable via software configuration. It also supports 16-bit linear PCM coding, allowing flexible integration with DSPs or VoIP processors requiring uncompressed samples.
How many time slots can the LE58QL021FJCT handle on its single PCM highway?
The LE58QL021FJCT supports up to 128 time slots per single PCM highway when operating at the maximum PCLK frequency of 8.192 MHz. Time slot assignment is fully programmable via the Time Slot Assigner (TSA) block using MPI commands 40h–45h.
What is the purpose of the C51–C54 pins on the LE58QL021FJCT?
The C51–C54 pins are dedicated supervision inputs per channel, providing a fifth bit for enhanced line-state monitoring-such as ground key detection, battery reversal, or advanced metering signal recognition-beyond the standard C3x/C4x supervision bits. This capability is unique to the LE58QL021FJCT among the QLSLAC family.
Is the LE58QL021FJCT pin-compatible with the LE58QL02FJCT?
No, the LE58QL021FJCT is not pin-compatible with the LE58QL02FJCT. Although both use 44-pin PLCC packages, LE58QL02FJCT includes dual PCM highway pins (DRB/DXB/TSCB) and lacks C51–C54 supervision inputs, while LE58QL021FJCT adds C5x pins and omits the second highway signals-requiring distinct PCB layouts.
LE58QL021FJCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 44-LCC (J-Lead)
- Packaging:
- Tape & Reel (TR)
- 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)
LE58QL021FJCT FAQ
1.How can I place an order for LE58QL021FJCT through Aetrix?
Please submit a Request for Quotation (RFQ) for LE58QL021FJCT 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 LE58QL021FJCT reliable?
The price and inventory of LE58QL021FJCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LE58QL021FJCT is usually 5 days.
3.What payment methods are accepted for LE58QL021FJCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LE58QL021FJCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LE58QL021FJCT?
LE58QL021FJCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LE58QL021FJCT 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 LE58QL021FJCT?
For technical support, including LE58QL021FJCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LE58QL021FJCT requirements.
6.How does Aetrix verify that LE58QL021FJCT is sourced from the original manufacturer or authorized distributors?
All LE58QL021FJCT 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 LE58QL021FJCT meets industry standards.
7.What is the process for return or replacement of LE58QL021FJCT?
All LE58QL021FJCT units undergo pre-shipment inspection (PSI). If there is an issue with LE58QL021FJCT, 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 LE58QL021FJCT part is unused and in its original packaging.
Return procedure for LE58QL021FJCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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