LAN9312-NZW

Controllers Overview

The LAN9312-NZW is a high-performance, full-featured two-port 10/100 managed Ethernet switch designed for embedded applications. It integrates a 3-port VLAN Layer 2 switch engine, 32K buffer RAM, and a 1K entry forwarding table. The device features two internal 10/100 PHYs with HP Auto-MDIX support, compliant with IEEE 802.3 standards. It includes an integrated Host Bus Interface (HBI) providing a simple SRAM-like interface to most 32-bit embedded CPUs. Key capabilities include IEEE 802.1Q VLAN support, QoS packet prioritization, IGMP snooping, and an IEEE 1588 Hardware Time Stamp Unit. The component operates on a single 3.3V power supply.

Controllers Feature Summary

• Integrates a high-efficiency 3-port Ethernet switch fabric with dynamic QoS queues per port.
• Features a unique Virtual PHY that simplifies software development by mimicking multiple switch ports as a single MAC/PHY.
• Includes an integrated IEEE 1588 Hardware Time Stamp Unit with a global 64-bit tunable clock for precise timing.
• Provides comprehensive power management including Wake-on-LAN, magic packet wakeup, and energy detect modes.

Controllers Applications

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

Controllers Procurement Notes

Verify the specific ordering suffix -NZW against the manufacturer's current datasheet to confirm package type and temperature range. Ensure compatibility with the host system's 32-bit bus interface requirements. Check for any recent Product Change Notifications (PCNs) regarding assembly site transfers or material changes. Confirm RoHS compliance status matches project specifications.

Controllers Selection Notes

Select this component when a compact, managed Ethernet switch solution is required for embedded systems with limited board space. It is suitable for designs needing IEEE 1588 precision time protocol support. Consider the 32-bit non-PCI CPU interface for direct integration with standard microprocessors. Evaluate the need for VLAN and QoS features if network traffic prioritization is critical.

Controllers Part Context

The LAN9312 belongs to Microchip's family of high-performance Ethernet switches. It is part of the LAN931x series, which includes variants like the LAN9311 and LAN9313. These devices share similar core architectures but differ in port counts and interface options. The LAN9312 specifically targets applications requiring two switched ports with advanced management features.

Controllers Replacement Considerations

LAN9311I-NZW: Two-port variant with I2C interface instead of parallel HBI. LAN9313-NZW: Three-port variant with additional port capabilities. Verify pinout and register compatibility before substitution.