LAN9355T/ML

Controllers Overview

The LAN9355T/ML is a 3-port managed Ethernet switch IC manufactured by Microchip Technology. It integrates three 10/100 Mbps MACs and two internal PHY transceivers with HP Auto-MDIX support. The device operates on a single 3.3V supply utilizing an integrated 1.2V regulator, or external regulation. It supports MII, RMII, and Turbo MII interfaces for up to 200Mbps throughput. Key specifications include 32K buffer RAM, a 512-entry forwarding table, IEEE 802.1Q VLAN support, and an integrated IEEE 1588v2 hardware timestamp unit. The component is housed in an 88-pin QFN package.

Controllers Feature Summary

• Integrated IEEE 1588v2 hardware timestamping supporting boundary clock and transparent clock modes
• Advanced Quality of Service (QoS) with per-port dynamic queues and programmable rate limiting
• Flexible port configuration supporting MII, RMII, and Turbo MII interface modes
• Comprehensive power management including Wake-on-LAN and multiple low-power states

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 ordering suffix against the manufacturer's current datasheet to confirm package type and temperature range. Ensure compatibility with the required I/O voltage levels and interface standards before integration. Confirm RoHS compliance status and moisture sensitivity level requirements for your assembly process.

Controllers Selection Notes

Select this component when a managed switch solution with integrated PHYs is required for embedded applications. It is suitable for designs needing IEEE 1588 precision timing or advanced QoS features. Consider the 88-QFN package constraints and thermal dissipation requirements associated with the integrated regulator.

Controllers Part Context

This part belongs to the LAN9354/LAN9355 family of 3-port managed Ethernet switches. It shares architectural similarities with the LAN9354 but offers enhanced interface flexibility through dual MII/RMII/Turbo MII support. The series is designed for cost-effective integration in consumer and industrial networking devices.

Controllers Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Verify functional equivalence with other Microchip LAN93xx series components if pin-to-pin replacement is necessary.

Controllers FAQ

Does the LAN9355 support fiber optic connections?

Yes, 100BASE-FX support is available via an external fiber transceiver connected to the appropriate ports.

What is the maximum data rate supported by the Turbo MII interface?

The Turbo MII interface allows for data rates of up to 200Mbps.

How is the internal 1.2V regulator configured?

The device can operate from a single 3.3V supply using the integrated linear regulator, or the regulator can be disabled to allow usage of an external high-efficiency regulator.