LE58QL021BVCT

Telecom Overview

The LE58QL021BVCT 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 telecommunications line card applications. 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 formats and features software-programmable parameters including SLIC input impedance, transhybrid balance, transmit/receive gains, and equalization. The device utilizes a standard microprocessor interface and offers dual PCM port options to support up to 128 channels per port at an 8.192 MHz clock rate.

Telecom Feature Summary

• Performs the functions of four independent codec/filters with software programmability for transmission parameters
• Compatible with Le79Q02/021/031 QSLAC devices regarding software and coefficients
• Supports multiplexed SLIC device outputs and includes built-in test modes such as loopback and tone generation

Telecom Applications

• Codec function on telephone switch line cards

Telecom Procurement Notes

Verify the specific ordering suffix 'T' indicates tape and reel packing as documented in the datasheet. Confirm that the base part number corresponds to the single PCM highway configuration with five programmable I/O pins. Ensure compatibility with existing system designs referencing the Le79Q02 family due to coefficient and software alignment.

Telecom Selection Notes

Select this component when a design requires four-channel audio processing with a single PCM highway interface. It is suitable for systems needing software-configurable transhybrid balancing and impedance scaling. Verify that the 44-pin TQFP package meets the board layout requirements and that the 3.3 V supply voltage aligns with the target platform's power architecture.

Telecom Part Context

This device belongs to the Le58QL02/021/031 series of Quad Low Voltage Subscriber Line Audio-Processing Circuits. It serves as a cost-effective solution for programmable line cards by integrating key analog line card functions into a high-performance CMOS device. The architecture is based on proven Legerity SLAC device families, ensuring reliability in telecommunications equipment.

Telecom Replacement Considerations

The LE58QL021FJC is a pin-compatible alternative available in a 44-pin PLCC package. Both parts share identical functionality and are software compatible with the Le79Q02 series. Selection between them depends primarily on the required surface mount versus leaded package type.