KSZ8999I

Specialized ICS Overview

The KSZ8999I is a nine-port (8+1) 10/100 integrated Ethernet switch manufactured by Microchip Technology. It incorporates eight physical layer transceivers and one Media Independent Interface (MII) or Serial Network Interface (SNI). The device features an internal frame buffer with 128K bytes of SRAM, supporting wire-speed reception and transmission with a 2.0 Gbps memory bandwidth. It operates within an industrial temperature range of -40°C to +85°C and utilizes a single 2.0V core supply with options for 2.5V or 3.3V I/O.

Specialized ICS Feature Summary

• Nine-port architecture with eight PHY ports and one MII/SNI interface
• Integrated 128K byte SRAM frame buffer for high-performance switching
• Supports 10BASE-T, 100BASE-TX, and 100BASE-FX media types
• Hardware-based VLAN, priority queuing, and broadcast storm protection

Specialized ICS Applications

• Unmanaged 8-port standalone network switches
• 9-port switches with public network access via external router
• Industrial networking equipment requiring wide temperature tolerance

Specialized ICS Procurement Notes

Verify the specific suffix 'I' confirms the industrial temperature grade (-40°C to +85°C), as the commercial variant lacks this rating. Confirm package availability in the 208-lead PQFP format. Check current lifecycle status, as older Micrel-derived parts may have limited distribution channels.

Specialized ICS Selection Notes

Select the KSZ8999I when unmanaged operation without processor intervention is required. Ensure the design supports the 2.0V core voltage and appropriate I/O levels. Verify that the application requires support for both copper (UTP) and fiber (FX) media on the physical ports.

Specialized ICS Part Context

This component belongs to the KSZ8999 family of integrated Ethernet switches. Originally developed by Micrel, the product line was acquired by Microchip Technology. The 'KSZ8999I' designation specifically denotes the industrial temperature version of the standard KSZ8999 commercial part.

Specialized ICS Replacement Considerations

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