LAN9311-NZW

Controllers Overview

The LAN9311-NZW is a two-port managed Ethernet switch IC from Microchip Technology, designed for embedded applications. It integrates a 10/100 switch fabric with 32K buffer RAM and a 1K entry forwarding table. The device features two internal 10/100 PHYs with HP Auto-MDIX support and a Virtual PHY for host connectivity. It supports a 16-bit non-PCI CPU interface via the Host Bus Interface (HBI). Key capabilities include IEEE 802.1Q VLAN support, QoS packet prioritization, IGMP monitoring, and an integrated IEEE 1588 Hardware Time Stamp Unit. The component operates on a single 3.3V power supply.

Controllers Feature Summary

• Integrated IEEE 1588 Hardware Time Stamp Unit for precise timing synchronization
• Supports VLAN tagging, QoS packet prioritization, and rate limiting functions
• Virtual PHY feature simplifies software development by mimicking multiple ports as a single MAC/PHY
• Comprehensive power management including Wake-on-LAN and magic packet wakeup

Controllers Applications

• Cable, satellite, and IP set-top boxes
• Digital televisions and digital video recorders
• VoIP and video phone systems
• Home gateways and test/measurement equipment

Controllers Procurement Notes

Verify the specific suffix 'NZW' against the manufacturer's current datasheet to confirm package type and temperature range. Ensure compatibility with the required 16-bit host bus interface and 3.3V power supply requirements. Check for any recent Product Change Notifications (PCNs) regarding assembly sites or material changes before finalizing procurement.

Controllers Selection Notes

Select this component when a compact, managed two-port Ethernet solution is required for embedded systems. It is suitable for designs needing hardware timestamping via IEEE 1588 and flexible QoS policies. Consider the 128-TQFP package constraints and the need for an external 25MHz crystal oscillator for clock generation during system architecture planning.

Controllers Part Context

The LAN9311 series belongs to Microchip's family of managed Ethernet switches. It serves as a cost-effective alternative to discrete switch and PHY solutions, integrating MAC, PHY, and switch fabric functions into a single chip. This integration reduces board space and component count compared to multi-chip implementations.

Controllers Replacement Considerations

Consult the official Microchip LAN9311 datasheet for confirmed substitute part numbers. Verify pinout and register compatibility if replacing with other models in the LAN9311 family or similar managed switch ICs.