LAN9352/ML

Controllers Overview

The LAN9352 is a 2-port managed Ethernet switch integrating an 8/16-bit host bus interface and IEEE 1588v2 hardware timestamping. It features two internal 10/100 PHYs with HP Auto-MDIX, supporting 10BASE-T and 100BASE-TX standards. The device includes a 32K buffer RAM, a 512-entry forwarding table, and supports VLAN, QoS, and rate limiting. Power options include a single 3.3V supply with an integrated 1.2V regulator or external regulation. Host connectivity is provided via indexed register access, multiplexed address/data bus, or SPI/Quad SPI slave interfaces.

Controllers Feature Summary

• Integrates a high-performance 3-port Ethernet Switch Fabric with dynamic QoS queues for efficient packet handling.
• Supports comprehensive network management including IEEE 802.1Q VLAN tagging, spanning tree protocol, and IGMP monitoring.
• Features an integrated IEEE 1588v2 hardware timestamp unit for precise time synchronization in boundary and transparent clock modes.
• Provides flexible host bus connectivity through indexed registers, multiplexed buses, or low-pin-count SPI/Quad SPI interfaces.

Controllers Applications

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

Controllers Procurement Notes

Verify the specific suffix (e.g., I for industrial, T for tape and reel) against the datasheet to confirm temperature range and packaging type. Ensure the selected package variant matches the PCB footprint requirements. Confirm that the host system voltage levels are compatible with the device's variable voltage I/O specifications before integration.

Controllers Selection Notes

Select this component when a managed switch with embedded CPU control is required. Choose the 72-QFN package for compact designs or the 80-TQFP-EP for easier prototyping. Verify that the host processor supports one of the available interface modes: indexed register, multiplexed bus, or SPI. Consider power dissipation if disabling the internal regulator for external regulation.

Controllers Part Context

The LAN9352 belongs to Microchip's family of 10/100 managed Ethernet switches designed for embedded applications. It combines switch fabric, MACs, and PHYs into a single IC, reducing bill-of-materials complexity compared to discrete solutions. It serves as a bridge between host processors and Ethernet networks, offering advanced traffic management capabilities.

Controllers Replacement Considerations

LAN9354I/ML

Controllers FAQ

Does the LAN9352 support fiber optic connections?

Yes, the device supports 100BASE-FX operation via an external fiber transceiver connected to the appropriate pins.

What is the maximum SPI clock rate supported by the LAN9352?

The SPI/Quad SPI slave controller supports clock rates of up to 80 MHz.

Can the LAN9352 operate with a single 3.3V power supply?

Yes, it can operate from a single 3.3V supply using its integrated 3.3V to 1.2V linear regulator, or by disabling the regulator and using an external 1.2V source.