KSZ8864CNXIA is an integrated, low-power 4-port Ethernet switching chip launched by Microchip (formerly Micrel). It features a highly integrated design, including three 10/100 Mbps PHyS, four MACS, and a switching engine that supports management functions. It is particularly suitable for scenarios where multi-port Ethernet communication needs to be implemented in a small package, such as industrial controllers, embedded gateways, intelligent routers, network printers, building automation systems, etc.
Main technical parameters
Project parameters
The number of ports: 4 ports (3 PHY + 1 MAC MII/RMII/RGMII interface)
The management mode supports SMI, MIIM and EEPROM configuration
The MAC address table supports 2048 addresses
QoS supports IEEE 802.1p and DSCP priority scheduling
VLAN supports IEEE 802.1Q VLAN marking and filtering
Security supports port isolation, broadcast storm protection, etc
Operating temperature: -40°C to +85°C (industrial grade)
Product feature highlights
✅ Three-in-one: Built-in 3 10/100 PHY + 4 MAC + switch controller for simplified design
✅ Flexible interface: Port 4 can be configured as MII, RMII or RGMII interface, with high compatibility with the master controller
✅ QoS and VLAN: Support priority, port, VLAN forwarding policies
✅ Low power design: Energy saving function for embedded systems
✅ EEPROM auto-start configuration: supports auto-initialization without master controller
✅ Industrial operating temperature: reliable to operate in harsh environments
✅ Loopback mode: convenient for testing and network debugging
Typical application scenarios
🏭 Industrial automation equipment such as PLCS, industrial gateways, data collectors
🧠 Smart terminal: router, gateway, IP phone, POS machine
🖨️ Web printing and sharing devices
🏢 Building and security systems: such as IP cameras, intercom systems
📡 IoT gateways and edge computing devices
Pin Diagram and Package Description (128-LQFP)
Standard 128-pin LQFP package The pins include power supply, clock, PHY interface, management port (MIIM/SMI), EEPROM, RGMII/MII, etc
Compatible and alternative models
Model manufacturer characteristics
The KSZ8864-16MVLI Microchip has similar functions but different packages
KSZ8895MQXCA Microchip 5-port switching chip, with more PHyS
LAN9303 Microchip 3-port switching chip, suitable for more compact designs
RTL8304MB Realtek 4-port switching chip, software compatibility needs to be confirmed
BCM53115 is an enterprise-level product of Broadcom, with stronger functions but higher costs
⚠️ Alternative options are recommended to be evaluated based on factors such as actual package space, master interface, power compatibility, etc.
Summary
KSZ8864CNXIA, with its excellent integration, powerful functional configuration and high cost performance, is an ideal chip for realizing multi-port Ethernet communication. It is particularly suitable for high-speed network connection solutions for industrial and intelligent Internet of Things devices.
