Microchip Technology LE58QL061BVCT

Overview

LE58QL061BVCT from Zarlink Semiconductor is a quad-channel, low-voltage subscriber line audio-processing circuit (QLSLAC™) implementing codec, digital filtering, and two-to-four-wire conversion for telecom line cards. It operates on 3.3 V CMOS with 5 V-tolerant digital inputs, supports PCM/MPI or GCI interface modes, delivers 2.048 Mbits/s data rate, and integrates four independent signal processing channels with software-programmable transmit/receive gains, A-law/µ-law coding, and real-time interrupt capability.

For engineers reviewing the LE58QL061BVCT datasheet, LE58QL061BVCT pinout, LE58QL061BVCT application, or LE58QL061BVCT equivalent, this device is selected for programmable BORSCHT implementation in carrier-grade line cards requiring channel-level gain control, time-slot assignment up to 128 per port, chopper clock support for SLIC devices, and compatibility with Le79Q061/063 QSLAC coefficient sets.

Technical Context

The LE58QL061BVCT implements four fully independent analog signal paths, each with dedicated digital filters for transmit/receive equalization, transhybrid balancing, and impedance scaling. Its architecture supports dual PCM ports or General Circuit Interface (GCI) mode, enabling unified control and PCM data transfer over a single port at 2.048 MHz or 4.096 MHz clock rates.

It features pin-selectable interface configuration, programmable digital I/O with debouncing, built-in test modes (loopback, tone generation), and µP-accessible real-time data registers with open-drain or TTL interrupt output. Clock derivation supports nine master clock frequencies from 1.536 MHz to 8.192 MHz via MCLK or PCLK.

Key Specifications

Pinout & Package

LE58QL061BVCT is housed in a 44-pin Thin Quad Flat Package (TQFP), RoHS-compliant and optimized for high-density line card layouts. The package supports standard surface-mount reflow profiles and provides thermal performance suitable for sustained operation in telecom environments.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad-channel telecom codec applications.

Compared with LE58QL061BVCT, LE58QL063HVC offers greater time-slot capacity and E1 support but requires PCB redesign, while Le79Q061BVC lacks GCI, chopper clock, and AISN-making it unsuitable for new SLIC-integrated designs requiring those features.

Availability

LE58QL061BVCT is available at Aetrix Electronics and suitable for central office line cards, remote terminal units, V.90 modem front-ends, and VoIP gateway analog cards requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for LE58QL061BVCT 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 high-reliability communications ICs, acquired by Microsemi in 2011. Its products targeted carrier-grade telecom infrastructure with emphasis on signal integrity and regulatory compliance.

The LE58QL061BVCT belongs to the Ve580 Series QLSLAC™ product line, designed specifically to replace discrete codec-filter-SLIC interface solutions in programmable line cards while delivering full BORSCHT functionality in a single, software-configurable IC.

FAQ

What is the primary function of the LE58QL061BVCT in a telecom line card?

The LE58QL061BVCT performs the codec, digital filtering, and two-to-four-wire conversion functions required for BORSCHT implementation. It processes four independent analog voice channels, converts them to/from PCM format, applies programmable gain and equalization, and interfaces directly with SLIC devices-enabling full subscriber line interface functionality in a single IC.

Does the LE58QL061BVCT support both A-law and µ-law companding?

Yes, the LE58QL061BVCT supports A-law, µ-law, and linear PCM coding through software configuration. This allows deployment in both European (A-law) and North American (µ-law) telephony networks without hardware changes, and the selection is made per-channel via the operating functions register.

Can the LE58QL061BVCT operate with a 4.096 MHz clock?

Yes, the LE58QL061BVCT supports a 4.096 MHz clock option in both PCM/MPI and GCI modes. In PCM/MPI mode, this clock serves as PCLK; in GCI mode, it operates as DCL. The device also accepts eight additional master clock frequencies ranging from 1.536 MHz to 8.192 MHz.

Is the LE58QL061BVCT pin-compatible with the Le79Q061 series?

No, the LE58QL061BVCT is not pin-compatible with the Le79Q061 series. While software and coefficient compatible, it uses a 44-pin TQFP package versus the Le79Q061's 48-pin TQFP, and pin assignments for SLIC interface, clocking, and control differ significantly-requiring PCB layout revision for migration.

What interface modes does the LE58QL061BVCT support, and how are they selected?

The LE58QL061BVCT supports two interface modes: PCM/Microprocessor Interface (PCM/MPI) and General Circuit Interface (GCI). Mode selection is controlled by the hardware GCI/PCM pin: logic high selects GCI mode (unified control/data port), logic low selects PCM/MPI mode (separate control and PCM data buses).