My Inquiry
My Account
Microchip Technology LE58QL021BVCT
- Part No.:
- LE58QL021BVCT
- Manufacturer:
- Microchip Technology
- Category:
- Telecom
- Package:
- 44-TQFP
- Datasheet:
-
LE58QL021BVCT.pdf
- Description:
- IC TELECOM INTERFACE 44TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,322
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LE58QL021BVCT 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, gain, equalization, and SLIC interface control - enabling full BORSCHT functionality with Legerity SLIC devices.
For engineers reviewing the LE58QL021BVCT datasheet, LE58QL021BVCT pinout, LE58QL021BVCT application, or LE58QL021BVCT equivalent, key selection criteria include dual PCM highway support (single-port variant), 44-pin TQFP RoHS-compliant packaging, software-coefficient compatibility with Le79Q02/021/031 QSLAC™ devices, and guaranteed performance across 12 dB gain range with real-time data register interrupt capability.
Technical Context
The LE58QL021BVCT implements four independent signal processing channels using digital filters clocked by MCLK or PCLK (1.536–8.192 MHz), with each channel supporting programmable transmit/receive gains, transhybrid balancing, and two-wire impedance matching via FIR/IIR filter coefficients. Its SLIC Device Interface (SLI) provides five programmable I/O per channel for SLIC control, supervision, and LED/optocoupler management.
It features a standard serial microprocessor interface (MPI) with CS/DCLK/DIO/RST/FS/INT signals, time slot assigner (TSA) for flexible PCM time-slot mapping, and chopper clock generation (256 kHz or 293 kHz) optimized for Legerity SLIC switching regulators. Real-time data register with open-drain or TTL interrupt output enables system-level event monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | Four independent, software-configurable audio processing channels |
| Supply Voltage | 3.3 V core with 5-V tolerant digital I/O - enables direct interfacing to legacy 5 V microcontrollers |
| Coding Formats | A-law, µ-law, or 16-bit linear PCM - supports global telephony standards and high-fidelity voice transport |
| PCM Clock Range | 1.536 to 8.192 MHz - accommodates E1/T1, ISDN, and V.90 modem timing requirements |
| Gain Range | Guaranteed performance over 12 dB - ensures consistent audio fidelity across line impedance variations |
| SLIC Interface | Five programmable I/O per channel - supports bidirectional control, supervision, and status reporting for Legerity SLICs |
| Chopper Clock | 256 kHz or 293 kHz - synchronizes switching regulator operation in Legerity SLIC devices |
| Interrupt Output | Real-time data register with open-drain or TTL output - enables immediate firmware response to analog events |
Pinout & Package
LE58QL021BVCT is housed in a 44-pin TQFP (Thin Quad Flat Package) with exposed thermal pad, RoHS-compliant green finish, and 10 mm × 10 mm body size (0.8 mm pitch). The package supports automated surface-mount assembly and thermal dissipation required for dense line card deployments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1–VIN4 | Analog input (channel 1–4) | Receive path analog inputs from SLIC line interface circuits |
| VOUT1–VOUT4 | Analog output (channel 1–4) | Transmit path analog outputs to SLIC line drivers |
| CD11–CD24 | SLIC control/data (per channel) | Digital control lines for SLIC device configuration and supervision |
| C31–C54 | SLIC I/O (per channel) | Programmable bidirectional I/O for LED, optocoupler, and status signaling |
| PCLK | PCM clock input | Synchronizes PCM data transfer at rates up to 8.192 MHz |
| MCLK/E1 | Master clock or E1 frame sync | Provides timing reference for internal DSP and optional E1 multiplex mode |
| CS, DCLK, DIO, RST, FS, INT | MPI interface signals | Serial microprocessor interface with chip select, data clock, bidirectional data, reset, frame sync, and interrupt |
| VCCA, VCCD, AGND, DGND | Analog/digital power and ground | Separate analog/digital supply domains minimize noise coupling in mixed-signal operation |
Key Features
| Feature | Design Value |
|---|---|
| Software-programmable transhybrid balance | Enables dynamic echo cancellation tuning without hardware changes, critical for variable loop-length environments |
| Independent channel enable (EC1–EC4) | Allows selective activation of channels for power optimization and partial reconfiguration during runtime |
| Broadcast-mode programming | Simultaneous register writes to all enabled channels reduce initialization overhead in multi-channel systems |
| WinSLAC™ coefficient calculation support | Enables rapid filter design and validation using vendor-provided PC software before deployment |
| Robbed-bit signaling compatibility | Supports legacy E1/T1 channel-associated signaling (CAS) without external logic or timing adjustments |
| Programmable debounce on one input | Eliminates mechanical switch bounce in hookswitch or test-button interfaces without external RC networks |
Applications
| DSLAM Line Card | VoIP Gateway |
|---|---|
Use Scenario: High-density DSL access multiplexer with integrated voice port support for POTS backup. IC Role / Device Role / Timing Role: Performs four-channel codec, transhybrid balancing, and SLIC interface control to deliver BORSCHT functions per line. Use Value: Enables single-chip replacement of discrete codec/filter solutions, reducing BOM count and PCB area while maintaining V.90 modem bandwidth compliance. | Use Scenario: Carrier-grade VoIP media gateway connecting PSTN trunks to SIP-based IP networks. IC Role / Device Role / Timing Role: Acts as primary audio-processing engine for TDM-to-IP transcoding, handling A-law/µ-law companding and PCM time-slot assignment. Use Value: Provides deterministic 128–8192 kHz PCM clocking and real-time interrupt-driven status reporting for seamless call setup and supervision. |
| Enterprise PBX | Remote Terminal Unit |
Use Scenario: Modular business telephone system supporting analog station ports and trunk interfaces. IC Role / Device Role / Timing Role: Implements four independent subscriber line interfaces with programmable impedance scaling and gain control. Use Value: Delivers consistent audio quality across diverse loop lengths (0–10 km) via software-adjustable receive/transmit gains and equalization. | Use Scenario: Rural telecommunications node aggregating multiple POTS lines into a fiber backhaul link. IC Role / Device Role / Timing Role: Serves as central audio processor for remote line cards, managing SLIC control, PCM framing, and chopper clock synchronization. Use Value: Integrates chopper clock generation (256/293 kHz) matched to Legerity SLIC regulators, eliminating need for external oscillator components. |
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; 44-pin PLCC package; includes chopper clock generation | Required where separate transmit/receive PCM buses or higher I/O count (four per channel) is needed | Select LE58QL02FJC when dual-hardware PCM paths or PLCC assembly preference outweighs TQFP density advantages |
| LE58QL031DJC | Single PCM highway; 32-pin PLCC; no chopper clock; only two SLIC I/O per channel | Suitable for cost-sensitive, lower-channel-count line cards with simplified SLIC supervision | Choose LE58QL031DJC for compact 32-pin footprint and reduced I/O complexity where chopper clock is not required |
Compared with LE58QL02FJC, LE58QL021BVCT offers single-PCM simplicity and TQFP thermal performance; versus LE58QL031DJC, it adds chopper clock support and three extra SLIC I/O pins per channel - making it optimal for full-featured, high-reliability line cards requiring regulator synchronization and extended supervision.
Availability
LE58QL021BVCT is available at Aetrix Electronics and suitable for DSLAM line cards, VoIP gateways, enterprise PBX systems, and remote terminal units requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant manufacturing.
Supply support for LE58QL021BVCT 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, specializing in timing, voice, and RF solutions before its acquisition by Microsemi in 2011.
The LE58QL021BVCT belongs to the QLSLAC™ product line, engineered specifically for software-defined telecom line cards needing integrated codec, filtering, and SLIC interface control in a single quad-channel device.
FAQ
What is the primary function of the LE58QL021BVCT in a telecom line card?
The LE58QL021BVCT serves as a quad-channel audio-processing circuit that performs codec conversion, digital filtering, transhybrid balancing, and SLIC device interface control - delivering complete BORSCHT functionality for up to four POTS lines. It replaces discrete analog and digital components with a single programmable IC, reducing design complexity and board space while maintaining carrier-grade voice quality and timing compliance.
Does the LE58QL021BVCT support both A-law and µ-law companding?
Yes, the LE58QL021BVCT natively supports both A-law and µ-law 8-bit companded PCM coding, as well as 16-bit linear format. This allows seamless integration into global telephony systems - A-law for ETSI-based networks (Europe, Asia) and µ-law for T1-based networks (North America, Japan) - without hardware modification or external translation logic.
How does the LE58QL021BVCT interface with SLIC devices?
The LE58QL021BVCT interfaces with SLIC devices via its SLIC Device Interface (SLI) block, providing five programmable I/O per channel (CD1x, CD2x, C3x, C4x, C5x) for digital control, supervision, and status reporting. It also generates a synchronized 256 kHz or 293 kHz chopper clock to drive Legerity SLIC switching regulators, ensuring precise timing alignment between audio processing and power delivery.
What clock frequencies does the LE58QL021BVCT support for PCM operation?
The LE58QL021BVCT supports master clock (MCLK) or PCM clock (PCLK) frequencies of 1.536, 1.544, 2.048, 3.072, 3.088, 4.096, 6.144, 6.176, or 8.192 MHz. These cover all major telephony standards including T1 (1.544 MHz), E1 (2.048 MHz), ISDN PRI (2.048/4.096 MHz), and V.90 modem (8.192 MHz) timing requirements, with programmable transmit clock edge selection for inter-device compatibility.
Is the LE58QL021BVCT pin-compatible with earlier QSLAC™ devices like the Le79Q021?
No, the LE58QL021BVCT is not pin-compatible with Le79Q021 due to differences in package (44-pin TQFP vs. 44-pin PLCC), pin assignments, and enhanced feature set (e.g., chopper clock, additional SLIC I/O). However, it is software and coefficient compatible - meaning existing WinSLAC™ filter designs and MPI command sequences can be reused, significantly accelerating migration from QSLAC™ to QLSLAC™ platforms.
LE58QL021BVCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 44-TQFP
- 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-TQFP (10x10)
LE58QL021BVCT FAQ
1.How can I place an order for LE58QL021BVCT through Aetrix?
Please submit a Request for Quotation (RFQ) for LE58QL021BVCT 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 LE58QL021BVCT reliable?
The price and inventory of LE58QL021BVCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LE58QL021BVCT is usually 5 days.
3.What payment methods are accepted for LE58QL021BVCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LE58QL021BVCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LE58QL021BVCT?
LE58QL021BVCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LE58QL021BVCT 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 LE58QL021BVCT?
For technical support, including LE58QL021BVCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LE58QL021BVCT requirements.
6.How does Aetrix verify that LE58QL021BVCT is sourced from the original manufacturer or authorized distributors?
All LE58QL021BVCT 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 LE58QL021BVCT meets industry standards.
7.What is the process for return or replacement of LE58QL021BVCT?
All LE58QL021BVCT units undergo pre-shipment inspection (PSI). If there is an issue with LE58QL021BVCT, 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 LE58QL021BVCT part is unused and in its original packaging.
Return procedure for LE58QL021BVCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LE58QL021BVCT Tags
-
LMC567CMX/NOPB
Texas Instruments
-
LM567CMX/NOPB
Texas Instruments
-
LM567CM/NOPB
Texas Instruments
-
VSC8531XMW-02
Microchip Technology
-
VSC8531XMW-05
Microchip Technology
-
GPY115C0VI
MaxLinear, Inc.
-
SI32185-A-FMR
Skyworks Solutions Inc.
-
VSC8541XMV-05
Microchip Technology
-
SI32178-B-FM1R
Skyworks Solutions Inc.
-
GPY215C0VI
MaxLinear, Inc.
-
CPC7514ZTR
Littelfuse Inc.
-
VSC8502XML-03
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
