Microchip LAN9353TI/PT: A 3-Port 10/100 Ethernet Switch with Integrated MAC and PHY

In the realm of embedded networking, the demand for compact, efficient, and highly integrated solutions continues to grow. The Microchip LAN9353TI/PT stands out as a robust answer to this demand, offering a comprehensive three-port Ethernet switch solution that simplifies design and reduces both system cost and board space. This device integrates two 10/100 Ethernet Physical Layer Transceivers (PHYs) and a switch fabric with a fully featured Media Access Controller (MAC), making it an ideal choice for a wide array of industrial, consumer, and automotive applications.

The core strength of the LAN9353 lies in its high level of integration. By combining the MAC and PHY layers for two ports and providing a third MAC-only port for connection to an external PHY or a host processor, the chip delivers exceptional flexibility. This architecture allows designers to implement multiple network topologies, such as bridging between two Ethernet segments and a host processor, without requiring multiple discrete components. The integrated PHYs comply with the IEEE 802.3u standard, ensuring reliable interoperability and robust performance over standard twisted-pair cabling.

A key feature of this switch is its support for advanced management and Quality of Service (QoS). It includes support for VLAN tagging, priority queues, and traffic policing, which are essential for managing data flow and ensuring low latency for time-critical packets in applications like industrial automation or in-vehicle infotainment systems. Furthermore, its low-power operational modes make it suitable for power-sensitive applications, aligning with modern energy efficiency requirements.

The device also simplifies the design-in process. It requires a single 25 MHz reference clock and operates on a single 3.3V power supply, minimizing external component count. Its industrial temperature range and robust construction ensure reliability in harsh environments.

ICGOODFIND: The Microchip LAN9353TI/PT is a highly integrated and versatile embedded Ethernet switch solution. Its combination of dual integrated PHYs, a third configurable MAC port, and advanced switching features provides a powerful, space-saving, and cost-effective foundation for building connected devices across numerous markets.

Keywords: Embedded Ethernet Switch, Integrated MAC and PHY, Quality of Service (QoS), VLAN Tagging, Low-Power Operation.