LE58QL021BVC

Telecom Overview

The LE58QL021BVC is a Quad Low Voltage Subscriber Line Audio-Processing Circuit (QLSLAC) manufactured by Microchip Technology. It integrates four independent codec and filter channels within a single device, designed for telephone switch line cards. The component operates on low-power 3.3 V CMOS technology with 5-V tolerant digital inputs. It supports A-law, µ-law, or linear coding standards and features software-programmable parameters including SLIC input impedance, transhybrid balance, transmit/receive gains, and equalization. The device accommodates single PCM highway configurations with five programmable I/O pins and utilizes a standard microprocessor interface for control.

Telecom Feature Summary

• Performs functions of four independent codec/filters with software-configurable transmission parameters
• Compatible with Le79Q02/021/031 QSLAC devices regarding software and coefficients
• Supports standard microprocessor interface with programmable time slot assignment
• Enables mixed state analog and digital impedance scaling

Telecom Applications

• Codec function on telephone switch line cards

Telecom Procurement Notes

Verify the specific ordering suffix to confirm package type and packing method. The BVC suffix indicates a 44-pin TQFP tray configuration. Confirm RoHS compliance status as required by project specifications. Ensure compatibility with existing system clocking requirements before procurement.

Telecom Selection Notes

Select this component when a single-chip solution for four subscriber lines is required. It is suitable for designs needing software-defined audio processing characteristics. Verify that the single PCM highway architecture meets the system's bandwidth needs. Ensure the host processor supports the required serial interface protocol for configuration.

Telecom Part Context

This device belongs to the Le58QL02/021/031 family of QLSLAC circuits. These components are based on Legerity’s reliable SLAC device families. They provide a cost-effective solution for audio-processing functions in programmable line cards. The architecture allows for high line card density while minimizing power consumption.

Telecom Replacement Considerations

The LE58QL021BVC is software and coefficient compatible with the Le79Q02/021/031 QSLAC devices. Designers converting from QSLAC to QLSLAC should consult the official design conversion guide. Ensure pinout differences between PLCC and TQFP packages are addressed during board redesign.