KSZ8864RMNUB

Controllers Overview

The KSZ8864RMNUB is a Layer 2-managed 4-port Ethernet switch integrating four MACs and two 10/100Base-T/TX PHYs. It features a non-blocking shared memory switch fabric with 1.4 Gbps bandwidth and 64 Kbyte frame buffering. Ports 3 and 4 support dual MII or RMII interfaces for CPU connectivity. The device supports IEEE 802.1q VLAN, 802.1p/q QoS, RSTP, and IGMP snooping. Power supplies include 3.3V analog, 1.8V-3.3V digital I/O, and 1.2V core. It operates in commercial (0°C to +70°C) and industrial (-40°C to +85°C) ranges within a 64-pin QFN package.

Controllers Feature Summary

• Integrated Layer 2 managed switching with four MACs and two copper PHYs
• Dual MII/RMII interface support on Switch MACs 3 and 4
• Comprehensive traffic management including VLAN tagging, rate limiting, and broadcast storm protection
• Advanced power management with energy-detect mode and per-port shutdown capabilities

Controllers Applications

• VoIP Phone systems
• Set-Top boxes and Game consoles
• Automotive Ethernet applications
• Industrial Control networks
• Broadband Gateways and Firewalls

Controllers Procurement Notes

Verify the specific suffix RMNUB against the manufacturer's current datasheet DS00002229D to confirm the industrial temperature range and package type. Ensure compatibility with system voltage requirements for VDDIO and VDDAT. Confirm that the selected serial bus configuration via PS pins matches the intended EEPROM or SPI control architecture.

Controllers Selection Notes

Select this component when a compact, low-power managed switch solution is required for embedded systems. The dual MAC interface allows flexible connection to host processors via MII or RMII. Consider the industrial temperature grade if operating in harsh environments. Verify pin-strapping requirements for unmanaged mode operation if no external controller is present.

Controllers Part Context

The KSZ8864RMNUB belongs to the KSZ8864 family of integrated Ethernet switches. It is an evolution of the KSZ8864RMN, offering improved power efficiency and LinkMD diagnostics. The CNX variant denotes the commercial temperature range, while RMNUB specifies the industrial grade. Both share identical pinouts and functionality.

Controllers Replacement Considerations

The KSZ8864CNX serves as the commercial temperature equivalent. The KSZ8864RMN is the predecessor model with identical pinout but different process technology.