KSZ8863RLL

Controllers Overview

The KSZ8863RLL is a highly integrated 3-port managed Ethernet switch IC manufactured by Microchip Technology. It features two 10/100BASE-T/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 provides a non-blocking switch fabric with a 1k MAC address lookup table and supports IEEE 802.3u standards. The component is housed in a 48-pin LQFP package.

Controllers Feature Summary

• Supports IEEE 802.1q VLAN tagging and filtering with programmable rate limiting and broadcast storm protection.
• Includes advanced power management schemes such as energy-detect mode, per-port power-down, and dynamic clock tree shutdown.
• Features LinkMD TDR-based cable diagnostics to identify copper cabling faults like opens and shorts.
• Provides comprehensive configuration access via SMI, MIIM, SPI, and I2C interfaces.

Controllers Applications

• VoIP Phone
• Set-Top/Game Box
• Automotive
• Industrial Control
• IPTV POF

Controllers Procurement Notes

Verify the specific revision level (e.g., A3) against the latest datasheet errata before finalizing designs. Confirm that the RMII reference clock requirements align with the host processor's capabilities. Ensure proper decoupling capacitors are placed near VDDIO and VDDA_3.3 pins to maintain signal integrity and stable operation.

Controllers Selection Notes

Select the KSZ8863RLL when an RMII interface is required for the CPU connection instead of MII. Compare against KSZ8863MLL if MII is preferred or KSZ8863FLL if fiber optic connectivity is needed. Consider the industrial temperature range availability if operating conditions exceed standard commercial limits.

Controllers Part Context

The KSZ8863RLL belongs to the KSZ8863 family of 3-port 10/100 Mbps switches. It shares core switching architecture with the KSZ8863MLL and KSZ8863FLL variants. The primary distinction lies in the CPU interface type, with the RLL variant specifically designed for RMII connectivity.

Controllers Replacement Considerations

KSZ8863MLL

Controllers FAQ

What is the function of the FXSD1 pin on the KSZ8863RLL?

On the KSZ8863RLL, the FXSD1 pin (Pin 48) is not used for fiber signal detection. It should be left unconnected or tied to analog ground via a 1 kΩ pull-down resistor.

How does the bypass feature operate in the KSZ8863RLL?

The bypass mode automatically sustains switch functionality between Port 1 and Port 2 when the CPU connected via the RMII interface enters sleep mode, allowing system-level power saving without impacting normal switch operations.

Does the KSZ8863RLL support auto-negotiation?

Yes, the device conforms to the auto-negotiation protocol defined in Clause 28 of the IEEE 802.3u specification, allowing link partners to select the best common mode of operation.