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Microchip Technology LE58QL021BVC
- Part No.:
- LE58QL021BVC
- Manufacturer:
- Microchip Technology
- Category:
- Telecom
- Package:
- 44-TQFP
- Datasheet:
-
LE58QL021BVC.pdf
- Description:
- IC TELECOM INTERFACE 44TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,309
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Product details
Overview
LE58QL021BVC 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 - enabling full BORSCHT functionality when paired with four SLIC devices.
For engineers reviewing the LE58QL021BVC datasheet, LE58QL021BVC pinout, LE58QL021BVC application, or LE58QL021BVC equivalent, this device is selected for high-density, software-configurable telephone switch line cards requiring stable PCM timing, real-time data register interrupt support, and dual- or single-highway compatibility up to 8.192 MHz.
Technical Context
The LE58QL021BVC implements four independent signal processing channels using digital filters clocked by MCLK or PCLK, with programmable coefficients for transmit/receive gain, transhybrid balancing, and frequency response correction. Its SLIC Device Interface (SLI) provides five programmable I/O per channel for control and supervision of external SLICs.
It features a standard serial microprocessor interface (MPI) with CS/DCLK/DIO/RST/FS/INT signals, supports broadcast-mode configuration via Channel Enable register (4Ah), and includes a Time Slot Assigner (TSA) for flexible PCM time-slot mapping across single PCM highway operation at rates from 128 kHz to 8.192 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | Four independent analog-to-digital/digital-to-analog channels for simultaneous line processing. |
| Supply Voltage | 3.3 V core (VCCD/VCCA), with 5-V tolerant digital I/O pins enabling direct interfacing to legacy 5 V controllers. |
| Coding Format | A-law, µ-law, or 16-bit linear PCM - selectable per system requirement with 8-bit signaling byte option in transmit path. |
| PCM Clock Rate | Supports PCLK up to 8.192 MHz, enabling up to 128 channels per PCM port in time-division multiplexed systems. |
| Transhybrid Balance | Software-programmable digital filter-based echo cancellation with guaranteed performance over 12 dB gain range. |
| Real-Time Data Register | Interrupt-capable status register (open-drain or TTL output) providing instantaneous channel monitoring and fault reporting. |
| Chopper Clock | 256 kHz or 293 kHz output for synchronizing Legerity SLIC switching regulators, reducing EMI in power-constrained line cards. |
Pinout & Package
LE58QL021BVC is housed in a 44-pin TQFP (Thin Quad Flat Package) with 0.8 mm pitch, RoHS-compliant green packaging, and tray delivery format.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1–VIN4 | Analog input (channel 1–4) | Differential analog voice inputs from SLIC devices; each pair connects to dedicated channel ADC front-end. |
| VOUT1–VOUT4 | Analog output (channel 1–4) | Differential analog outputs driving SLIC line drivers; matched impedance for hybrid interface stability. |
| CD11–CD14, CD21–CD24 | SLIC control data outputs | Two dedicated digital control lines per channel for SLIC mode selection, LED/optocoupler control, and supervision feedback. |
| C31–C34, C41–C44, C51–C54 | SLIC I/O bidirectional lines | Five programmable I/O per channel (C3–C5) for SLIC supervision, ground key detection, and status reporting. |
| PCLK, MCLK/E1, FS, DCLK, CS, DIO, RST, INT | MPI and PCM interface | Serial microprocessor interface (CS/DCLK/DIO/RST/INT) plus PCM timing (PCLK/FS) and E1 multiplex support (MCLK/E1). |
| VCCD, VCCA, AGND, DGND | Power and ground | Separate digital (VCCD) and analog (VCCA) supplies with dedicated ground planes minimize noise coupling between signal domains. |
| VREF | Analog reference voltage | Internal precision reference for ADC/DAC conversion; externally bypassed to ensure stable 1.25 V nominal reference. |
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 | Configurable two-wire termination impedance via digital filter coefficients, eliminating need for external passive networks. |
| Transmit/receive gain control | Independent 12 dB programmable gain range per channel with linear step resolution for precise level matching. |
| Time slot assigner (TSA) | Flexible assignment of PCM time slots for transmit/receive paths, supporting non-contiguous or interleaved channel mapping. |
| Built-in test modes | On-chip loopback, tone generation, and µP-accessible PCM data enable in-system diagnostics without external test equipment. |
Applications
| Telephone Switch Line Cards | V.90 Modem Support |
|---|---|
Use Scenario: Digital line cards in central office switches handling 4-channel subscriber loops with BORSCHT functions. IC Role / Device Role / Timing Role: Primary codec/filter IC performing analog-digital conversion, echo cancellation, and PCM framing for four simultaneous voice lines. Use Value: Enables full software-defined line card architecture with real-time reconfiguration of gain, impedance, and equalization per channel. |
Use Scenario: High-speed modem line interface requiring extended bandwidth beyond narrowband telephony. IC Role / Device Role / Timing Role: Audio-processing front-end delivering maximum channel bandwidth compliant with V.90 analog modem specifications. Use Value: Guaranteed analog bandwidth meets V.90 spectral requirements, supporting 56 kbps downstream data transmission. |
| SLIC-Controlled Line Interfaces | Robbed-Bit Signaling Systems |
Use Scenario: Integration with Legerity SLIC devices (e.g., Le79Rxx) in compact, low-power line interface modules. IC Role / Device Role / Timing Role: Central controller managing SLIC supervision, chopper clock synchronization (256/293 kHz), and I/O state reporting. Use Value: Eliminates discrete logic for SLIC handshaking; reduces component count and PCB area in space-constrained designs. |
Use Scenario: North American T1-based systems using robbed-bit signaling for call supervision and feature activation. IC Role / Device Role / Timing Role: PCM highway manager supporting robbed-bit frame structure and embedded signaling byte insertion/removal. Use Value: Native compatibility with T1 robbed-bit frames ensures interoperability with legacy carrier infrastructure without protocol translation. |
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 | Same QLSLAC™ architecture but in 44-pin PLCC package with dual PCM highways; lacks C5x I/O lines. | Targeted at systems requiring independent transmit/receive PCM buses; not pin-compatible due to different package and I/O count. | Select LE58QL02FJC only when dual-highway topology and PLCC mounting are required; verify PCB layout and firmware timing changes. |
| LE58QL031DJC | Single PCM highway variant in 32-pin PLCC; supports only two SLIC I/O lines per channel and no chopper clock output. | Optimized for cost-sensitive, lower-channel-count line cards where SLIC supervision complexity is reduced. | Choose LE58QL031DJC for simplified 2-I/O SLIC interfaces and smaller footprint; confirm chopper clock and C5x functionality are unnecessary. |
Compared with LE58QL02FJC and LE58QL031DJC, the LE58QL021BVC uniquely offers five SLIC I/O lines per channel, chopper clock generation, and TQFP packaging - making it optimal for high-integration, space-constrained, single-highway telecom line cards demanding full SLIC control and V.90 bandwidth compliance.
Availability
LE58QL021BVC is available at Aetrix Electronics and suitable for telephone switch line cards, V.90 modem interfaces, and SLIC-controlled telecom infrastructure requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.
Supply support for LE58QL021BVC 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 communications ICs, acquired by Microsemi in 2011 and later integrated into Microchip Technology. It pioneered high-reliability telecom analog front-ends.
The LE58QL021BVC belongs to the QLSLAC™ product line, designed specifically for software-configurable, high-density telephone line card applications requiring integrated codec, filtering, and SLIC interface capabilities in a single chip.
FAQ
What is the primary function of the LE58QL021BVC in telecom line card design?
The LE58QL021BVC serves as a quad-channel audio-processing IC that performs codec, digital filtering, 2-wire/4-wire conversion, and SLIC interface control. It replaces discrete analog components and multiple smaller ICs, enabling full BORSCHT functionality in modern telephone switch line cards when used with four compatible SLIC devices.
Does the LE58QL021BVC support both A-law and µ-law companding?
Yes, the LE58QL021BVC supports both A-law and µ-law 8-bit companded PCM coding, as well as 16-bit linear coding. The coding format is software-selectable via its microprocessor interface, allowing seamless integration into E1 (A-law) and T1 (µ-law) telephony infrastructures.
What package type and pin count does the LE58QL021BVC use?
The LE58QL021BVC uses a 44-pin TQFP (Thin Quad Flat Package) with 0.8 mm pitch and RoHS-compliant green packaging. This differs from the PLCC variants (e.g., LE58QL02FJC) and enables higher board density and improved thermal performance in compact line card layouts.
How many SLIC control lines does the LE58QL021BVC provide per channel?
The LE58QL021BVC provides five programmable I/O lines per channel (C31–C34, C41–C44, C51–C54), enabling comprehensive supervision, ground key detection, and control of external SLIC devices - a key differentiator from the LE58QL031DJC (two I/O) and LE58QL02FJC (four I/O).
Is the LE58QL021BVC pin-compatible with earlier QSLAC™ devices like the Le79Q021?
No, the LE58QL021BVC is not pin-compatible with Le79Q021 due to differences in package (TQFP vs. PLCC), pin count (44 vs. 44 but different assignment), and expanded I/O set (five vs. four SLIC lines). However, it maintains full software and coefficient compatibility, allowing reuse of firmware and filter designs with hardware adaptation.
LE58QL021BVC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 44-TQFP
- Packaging:
- Tray
- 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-TQFP (10x10)
LE58QL021BVC FAQ
1.How can I place an order for LE58QL021BVC through Aetrix?
Please submit a Request for Quotation (RFQ) for LE58QL021BVC 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 LE58QL021BVC reliable?
The price and inventory of LE58QL021BVC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LE58QL021BVC is usually 5 days.
3.What payment methods are accepted for LE58QL021BVC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LE58QL021BVC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LE58QL021BVC?
LE58QL021BVC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LE58QL021BVC 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 LE58QL021BVC?
For technical support, including LE58QL021BVC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LE58QL021BVC requirements.
6.How does Aetrix verify that LE58QL021BVC is sourced from the original manufacturer or authorized distributors?
All LE58QL021BVC 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 LE58QL021BVC meets industry standards.
7.What is the process for return or replacement of LE58QL021BVC?
All LE58QL021BVC units undergo pre-shipment inspection (PSI). If there is an issue with LE58QL021BVC, 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 LE58QL021BVC part is unused and in its original packaging.
Return procedure for LE58QL021BVC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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