Microchip Technology LE58QL02FJCT

Overview

LE58QL02FJCT 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 up to 128 PCM channels per port at 8.192 MHz PCLK - used in telephone switch line cards.

For engineers reviewing the LE58QL02FJCT datasheet, LE58QL02FJCT pinout, LE58QL02FJCT application, or LE58QL02FJCT equivalent, key selection criteria include dual-PCM highway support, software-programmable transhybrid balance and impedance scaling, real-time data register with interrupt, chopper clock generation for SLIC devices, and compatibility with Le79Q02-series coefficient sets.

Technical Context

The LE58QL02FJCT implements four fully independent signal processing channels, each with dedicated VIN/VOUT analog I/O and programmable digital filters for transmit/receive gain, equalization, and transhybrid balancing. Its architecture uses a master clock derived from either MCLK or PCLK (1.536–8.192 MHz) to drive all digital signal processors and time slot assigner logic.

It features a standard serial microprocessor interface (CS/DCLK/DIO/RST/FS), dual PCM highway support with configurable time slot assignment and transmit clock edge selection, and SLIC device interface with five programmable I/O lines per channel - enabling supervision, LED control, and optocoupler operation in BORSCHT implementations.

Key Specifications

Pinout & Package

LE58QL02FJCT is housed in a 44-pin PLCC (Plastic Leaded Chip Carrier) package with 17.0 mm × 17.0 mm body size and 1.27 mm lead pitch. The package is RoHS-compliant (green) and supplied in tube packaging.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad audio-processing applications.

Compared with LE58QL021FJC and LE58QL031DJC, the LE58QL02FJCT uniquely provides dual PCM highways, chopper clock generation, and four SLIC I/O lines per channel - making it the only option for full-featured, self-contained BORSCHT implementation in high-density central office line cards.

Availability

LE58QL02FJCT is available at Aetrix Electronics and suitable for telephone switch line cards, V.90 modem interfaces, robbed-bit signaling systems, and SLIC-controlled supervision circuits requiring stable component supply and long-term industrial lifecycle support.

Supply support for LE58QL02FJCT 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, later acquired by Microsemi (now part of Microchip Technology). It pioneered highly integrated telecom line interface solutions.

The LE58QL02FJCT belongs to the QLSLAC™ product line, engineered specifically for high-density, software-configurable telephone line cards requiring full BORSCHT functionality with minimal external components.

FAQ

What is the primary function of the LE58QL02FJCT in telecom systems?

The LE58QL02FJCT serves as a quad low-voltage subscriber line audio-processing circuit that performs codec, digital filtering, 2-wire/4-wire conversion, and SLIC interface control. It replaces multiple discrete components in telephone switch line cards, delivering four independent channels with programmable gain, equalization, and transhybrid balance - all within a single 44-pin PLCC package.

Does the LE58QL02FJCT support both A-law and µ-law companding?

Yes, the LE58QL02FJCT 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 through the microprocessor interface, and the device maintains full compliance with ITU-T G.711 for both standards across its operating temperature range.

How does the LE58QL02FJCT handle SLIC device interfacing and supervision?

The LE58QL02FJCT interfaces with SLIC devices using dedicated control/data lines (CD1x/CD2x) and five programmable I/O pins (C3x–C5x) per channel. It reads supervision status (e.g., ring detect, battery feed) and drives LEDs/optocouplers directly. Programmable debounce on one input prevents false triggering during line transients - a feature confirmed in the LE58QL02FJCT datasheet Section 3.4.

What clock frequencies does the LE58QL02FJCT support for PCM operation?

The LE58QL02FJCT supports master clock frequencies of 1.536, 1.544, 2.048, 3.072, 3.088, 4.096, 6.144, 6.176, and 8.192 MHz - derived from either the MCLK/E1 or PCLK input. At 8.192 MHz PCLK, it supports up to 128 time slots per PCM port, enabling full E1/T1 frame handling with optional supervision byte insertion.

Is the LE58QL02FJCT pin-compatible with earlier QSLAC™ devices like the Le79Q02?

No, the LE58QL02FJCT is not pin-compatible with Le79Q02-series devices due to differences in package (44-pin PLCC vs. 48-pin TQFP), pin count, and I/O allocation. However, it is software and coefficient compatible - meaning existing WinSLAC™-generated filter coefficients and MPI command sequences can be reused without modification in LE58QL02FJCT-based designs.