Part Number: KSZ8999I

Manufacturer: Microchip Technology

Description: IC 10/100 INTEG SWITCH 208PQFP

Shipped from: Shenzhen/HK Warehouse

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Technical Specifications of KSZ8999I

Datasheet  KSZ8999I datasheet
Category Integrated Circuits (ICs)
Family Specialized ICs
Manufacturer Microchip Technology
Packaging Tube
Part Status Active
Type 10/100 Integrated Switch
Applications Port Switch/Network Interface
Mounting Type Surface Mount
Package / Case 208-BFQFP
Supplier Device Package 208-PQFP (28×28)


In today’s fast changing technological scene, there is a greater need than ever for high-speed, dependable, and effective networking solutions. The KSZ8999I is one such standout solution, with a combination of capabilities that make it a versatile and essential component in network architectures. This article will provide you a detailed overview of the KSZ8999I, including its functions, uses, and advantages.

Understanding the KSZ8999I

The KSZ8999I is a multi-faceted networking device that integrates numerous important components to offer an efficient and versatile solution for a variety of networking requirements. Let’s have a look at its main components and capabilities:

Physical Layer Transceivers

Significance of Physical Layer Transceivers in Networking

Physical Layer Transceivers (PHYs) are critical components of networking because they allow data to be sent between devices via a physical medium such as copper or fiber-optic cables. They are in charge of converting digital data into analog signals for transmission and converting incoming analog signals into digital data for reception. Here are some of the reasons why physical layer transceivers are important in networking:

  • Signal Transmission: PHYs translate digital data created by network devices like computers or switches into electrical or optical signals that can flow through the network media. This ensures that data can be transferred physically from one device to another.
  • Signal Reception: On the receiving end, PHYs convert incoming electrical or optical signals into digital data that network devices can process. This is required for obtaining and comprehending the information delivered by the signals.
  • Data Integrity: PHYs help to ensure data integrity throughout transmission by accurately encoding and decoding signals. They are in charge of tasks such as mistake detection and correction, as well as ensuring that data arrives intact.
  • Speed and Compatibility: PHYs come in a variety of speeds and support numerous Ethernet standards, making them compatible with a wide range of networking devices and network speeds.

KSZ8999I’s Eight 10/100 Physical Layer Transceivers

The KSZ8999I is a versatile networking component since it has eight 10/100 physical layer transceivers. These transceivers are designed to support both 10BASE-T and 100BASE-TX Ethernet standards, enabling network configuration flexibility. Here’s all you need to know about the physical layer transceivers in the KSZ8999I:

The device has eight physical layer transceivers, allowing it to connect to up to eight devices or network segments at the same time.

The KSZ8999I is equipped with eight 10/100 physical layer transceivers, making it a versatile networking component. These transceivers are designed to handle both 10BASE-T and 100BASE-TX Ethernet standards, providing flexibility in network configurations. Here’s what you need to know about the KSZ8999I’s physical layer transceivers:

  • Quantity: The device features eight physical layer transceivers, which means it can simultaneously connect with up to eight devices or network segments.
  • Speed Support:  Supported Ethernet speeds are 10 Mbps (10BASE-T) and 100 Mbps (100BASE-TX) for the transceivers. This adaptability guarantees that it is compatible with a wide range of devices and network requirements.
  • Versatility: With eight physical layer transceivers, the KSZ8999I may act as a hub in a network, allowing various devices to join and communicate efficiently.

Ethernet Standards Supported (10BASE-T, 100BASE-TX, 100BASE-FX)

The IEEE 802.3 committee has specified Ethernet standards for the KSZ8999I. It specifically supports the Ethernet standards listed below:

  • 10BASE-T: This standard defines Ethernet communication over twisted-pair copper wires at 10 Mbps. It is widely used in older Ethernet networks to offer basic connectivity.
  • 100BASE-TX: This standard supports 100 Mbps Ethernet communication via twisted-pair copper connections. It provides faster data transmission rates than 10BASE-T and is commonly used in current Ethernet networks.
  • 100BASE-FX: The KSZ8999I supports 100BASE-FX, which permits Ethernet communication at 100 Mbps through fiber-optic cables in addition to copper-based Ethernet standards. Fiber-optic links provide benefits such as increased range and resilience to electromagnetic interference.

The KSZ8999I assures compatibility with diverse network devices and media kinds by supporting these Ethernet standards, making it a versatile and adaptable networking solution.

Media Access Control (MAC) Units

The KSZ8999I’s capabilities are further enhanced by nine integrated Media Access Control (MAC) devices. MAC units are critical for regulating data flow in Ethernet networks and ensuring efficient device connectivity.

● Layer 2 Switch

The device has two modes of operation: an eight-port integrated switch and a nine-port switch with a Media Independent Interface (MII). Because of its versatility, you can set it as a standalone eight-port switch or integrate it into more complicated network topologies.

● Unmanaged Design

The KSZ8999I’s capacity to dwell in an unmanaged design that does not require regular processor involvement is one of its differentiating features. This is done with I/O strapping or EEPROM programming when the system is reset, which makes upkeep of the network easier.

● Energy Efficiency

The actual signal transmission and reception of the KSZ8999I are aided by modern analog circuitry. This improves performance while also resulting in lower power consumption and a smaller chip die area, making it an environmentally friendly alternative.

Applications of the KSZ8999I

The KSZ8999I’s adaptability allows it to be used in a variety of sectors and networking environments. Here are some examples of common applications:

● Small Office/Home Office (SOHO) Networks

The KSZ8999I can act as the heart of a network in a home or small office environment, providing steady and fast connectivity for various devices ranging from PCs to smart home appliances.

● Industrial Automation

The KSZ8999I’s sturdy architecture guarantees seamless communication across machines and devices in industrial environments, adding to the efficiency of automation processes.

● Public Network Interfacing

The KSZ8999I’s additional MII port in the nine-port configuration makes it a great tool for public network interfacing, connecting to external networks, and maintaining a stable data transmission link.

Benefits of Using the KSZ8999I

When you select the KSZ8999I for your networking needs, you obtain numerous key benefits:

  • The KSZ8999I is adaptable to different network configurations, making it suited for a wide range of applications.
  • Energy Efficiency: Its low power usage lowers running costs and impacts the environment.
  • Ease of Use: The unmanaged architecture simplifies setup and maintenance, making it usable for non-technical people as well.
  • Reliability: The sturdy structure provides continuous networking, which is vital for sensitive applications.


In conclusion, the KSZ8999I is a versatile networking solution that offers a multitude of features and benefits. Whether you’re setting up a home network or managing an industrial automation system, this device is designed to meet your networking needs efficiently and reliably. Embrace the power of the KSZ8999I, and watch your network performance soar to new heights.

Are you eager to embark on this transformative journey towards enhanced networking capabilities? Waste no time – reach out to ICRFQ, your trusted companion in electronic components. Contact us without delay to explore the limitless possibilities that the KSZ8999I can unlock for your projects. Elevate your networking endeavors today and experience the difference that this exceptional device can make.

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