KSZ9896CTXC
KSZ9896CTXC - 6-Port Gigabit Ethernet Switch | Microchip
The Microchip KSZ9896CTXC is a fully integrated, managed, six-port Gigabit Ethernet switch with five integrated 10/100/1000 Mbps PHYs and a configurable sixth-port MAC interface, housed in a 128-TQFP exposed-pad package measuring 14 x 14 mm. The switch supports GMII, RGMII, MII, and RMII configurations for connection to a host processor or network interface. Its IEEE 802.3 Ethernet switching core supports 10, 100, and 1000 Mbps operation while providing one additional configurable MAC port for uplink, inter-switch, or processor-facing connections.
A managed Ethernet switch is a Layer 2 network-semiconductor device that receives Ethernet frames on one port, examines addressing information, and forwards traffic through selected output ports. The switch-controller hierarchy includes Ethernet switch, Layer 2 managed switch, Ethernet interface IC, network semiconductor, and integrated circuit. Compared with a discrete collection of PHY and switching components, the KSZ9896 integrates five copper PHYs, switching logic, management features, and a flexible MAC interface into one device, reducing board area and interface complexity.
Important features include five integrated Gigabit PHYs, a sixth configurable MAC port, support for IEEE 802.3 operation, and host-control access through I2C and SPI interfaces. Automatic polarity correction, echo cancellation, and remote fault detection support reliable physical-layer links. The configuration strap pins allow the device to be initialized for different operating modes, while RESET_N provides a hardware reset function. Five of the six ports therefore support copper links, and the remaining port can be adapted to the required processor or uplink interface.
The sixth port’s configurable MAC interface makes the KSZ9896 suitable for systems that must connect a switch fabric to a host processor using GMII, RGMII, MII, or RMII. This flexibility reduces the need for separate PHY devices in architectures requiring a high-speed processor-facing uplink. Interface selection should be matched to the host’s timing, voltage, and data-width requirements, because the MAC mode determines the required external components and the applicable throughput ceiling.
Typical applications include industrial Ethernet equipment, embedded control systems, factory automation controllers, industrial gateways, networked measurement equipment, and compact embedded platforms requiring several Gigabit copper ports. The switch can serve as the central Layer 2 forwarding device in control cabinets, test systems, or industrial edge nodes. In a typical design, the five integrated PHY ports connect field devices or local computers, while the configurable sixth port interfaces to a host processor or another switch.
The 128-TQFP exposed-pad package requires careful PCB layout. Follow the manufacturer’s land pattern and thermal-via recommendations, especially when high-port-count traffic causes sustained activity in the PHYs and switching core. Provide the required input, output, and interface decoupling capacitors close to their associated pins, and route high-speed MAC signals over continuous reference planes while minimizing stubs and unprotected routing lengths.
This page combines the manufacturer’s six-port switching architecture, package information, interface options, engineering design notes, and verified sourcing guidance. It also distinguishes genuine drop-in coverage from related switch products whose port counts or interfaces make them unsuitable for a PCB-level substitution, helping engineers make a more reliable component-selection decision.
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