KSZ8873RLLI-TR

Controllers Overview

The KSZ8873RLLI-TR is a managed 3-port 10/100 Mbps Ethernet switch IC manufactured by Microchip Technology. It integrates two 10BASE-T/100BASE-TX transceivers and one RMII interface for CPU connectivity. The device operates on a single 3.3V supply with an internal 1.8V LDO, supporting digital I/O voltages of 3.3V, 2.5V, or 1.8V. It features a non-blocking switch fabric with a 1k MAC address lookup table and store-and-forward architecture. Operating temperatures range from -40°C to +85°C in a 64-pin LQFP package.

Controllers Feature Summary

• Supports IEEE 802.1q VLAN tagging and removal per port basis
• Includes bypass feature to sustain switching between ports during CPU sleep
• Provides comprehensive management via SPI, I2C, SMI, and MIIM interfaces
• Integrates Link MD cable diagnostics for copper cabling fault identification

Controllers Applications

• VoIP Phone
• Set-Top/Game Box
• Industrial Control
• SOHO Residential Gateway
• Standalone 10/100 Switch

Controllers Procurement Notes

Verify the suffix 'I' indicates industrial temperature grade (-40°C to +85°C) and 'TR' denotes tape and reel packaging. Confirm the RMII interface configuration matches the host processor requirements. Ensure power supply decoupling meets the datasheet specifications for VDDIO and VDDA_3.3 pins.

Controllers Selection Notes

Select this model when an RMII interface is required instead of MII. Compare against KSZ8873MLL for MII connectivity or KSZ8873FLL for fiber optic support. Consider the specific VDDIO voltage requirements (1.8V, 2.5V, or 3.3V) and ensure the host system supports the necessary serial management protocols.

Controllers Part Context

This component belongs to the KSZ8873 family of integrated 3-port switches. It shares the core switch fabric and PHY capabilities with the KSZ8873MLL and KSZ8873FLL variants. The primary distinction lies in the Port 3 interface type, where the RLL variant specifically utilizes an RMII connection for reduced pin count and simplified CPU interfacing.

Controllers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.