LAN9355/PT

Controllers Overview

The LAN9355 is a 3-port managed Ethernet switch integrating MACs, PHYs, and an I2C controller. It supports 10BASE-T and 100BASE-TX standards with HP Auto-MDIX. The device features a 32K buffer RAM and a 512-entry forwarding table. It operates on a single 3.3V supply via an integrated 1.2V regulator, or 1.8V to 3.3V variable voltage I/O. Key interfaces include MII, RMII, Turbo MII, and SMI. It includes IEEE 1588v2 hardware timestamping, QoS prioritization, VLAN support, and Wake-on-LAN capabilities.

Controllers Feature Summary

• Integrated 10/100 Ethernet Switch Fabric with dynamic QoS queues
• IEEE 1588v2 hardware time stamp unit for precise timing synchronization
• Dual internal PHYs with HP Auto-MDIX and Energy Efficient Ethernet compliance
• Serial management via I2C slave and SMI controllers

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 package variant required, as the LAN9355 is available in both 88-pin QFN and 80-pin TQFP-EP configurations. Confirm temperature range requirements against commercial and industrial specifications. Ensure the design accommodates the single 3.3V power supply architecture utilizing the integrated linear regulator. Cross-reference pin assignments carefully between package types due to functional differences.

Controllers Selection Notes

Select this component for embedded applications requiring a compact, managed 3-port switch solution. It is suitable where system cost control and ease of integration are priorities. The device supports flexible interface modes including MII, RMII, and Turbo MII. Consider the integrated EEPROM loader feature if static configuration storage is needed without external components.

Controllers Part Context

The LAN9355 belongs to Microchip's family of 3-port 10/100 managed Ethernet switches. It is designed for embedded environments demanding high performance and low power consumption. The device integrates all necessary functions for a complete switch system, including the switch fabric, packet buffers, and media access controllers.

Controllers Replacement Considerations

LAN9354T/ML

Controllers FAQ

Does the LAN9355 support fiber optic connections?

Yes, 100BASE-FX is supported via an external fiber transceiver connected to the appropriate port.

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

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

How is the device powered?

The LAN9355 can operate from a single 3.3V power supply using its integrated 1.2V regulator, or it can use an external regulator with 1.8V to 3.3V variable voltage I/O.