KSZ8864CNXIA

Controllers Overview

The KSZ8864CNXIA is a Layer 2 managed Ethernet switch featuring four ports compliant with IEEE 802.3u standards, supporting data rates of 10 Mb/s and 100 Mb/s. It integrates two 10/100 Mbps PHY transceivers and four MAC units, providing dual MII or RMII interfaces for processor connectivity. The device utilizes a shared memory-based switch fabric with 1.4 Gbps bandwidth and includes an on-chip 64 Kbyte frame buffer. Operating voltage ranges from 1.14 V to 3.465 V, with digital I/O supporting 3.3V, 2.5V, and 1.8V levels. It functions within an industrial temperature range of -40°C to +85°C and is housed in a 64-pin QFN package.

Controllers Feature Summary

• Supports IEEE 802.1q VLAN tagging with up to 128 groups and per-port configuration options.
• Integrates programmable rate limiting and broadcast storm protection mechanisms.
• Provides comprehensive management via SPI, I2C, and SMI/MDC/MDIO interfaces.
• Includes LinkMD cable diagnostics and port mirroring capabilities.

Controllers Applications

• VoIP Phone systems
• Automotive Ethernet networks
• Industrial Control equipment
• Broadband Gateway and Firewall devices

Controllers Procurement Notes

Verify the specific suffix 'A' against official Microchip documentation to confirm it denotes the Industrial Temperature Grade (-40°C to +85°C). Ensure compatibility with the required power supply voltages and interface modes (MII/RMII) before integration. Confirm that the 64-pin QFN package aligns with the target PCB layout constraints.

Controllers Selection Notes

Select this component when a cost-effective, low-power Layer 2 managed switch is required for embedded applications. It is suitable for designs needing both copper Ethernet ports and direct MAC connections to a host processor. Consider the available strap pins for configuring unmanaged mode or basic settings without external EEPROM if software control is not desired.

Controllers Part Context

This part belongs to the KSZ8864 family of integrated switches. The CNX variant typically indicates the commercial temperature grade, while the IA suffix specifies the industrial grade version. It serves as a pin-compatible successor to earlier models like the KSZ8864RMN, offering enhanced power efficiency and additional diagnostic features.

Controllers Replacement Considerations

The KSZ8864RMNUB is a pin-compatible alternative within the same family. Verify if the commercial temperature range of the RMNUB meets system requirements, as the CNXIA is specified for industrial temperatures. Check for any minor silicon revisions or errata differences between the specific manufacturing batches.