KSZ8993MI

Microchip Technology KSZ8993MI – 3-Port 10/100 Managed Ethernet Switch (MII), 128‑PQFP

The Microchip Technology KSZ8993MI is a 3‑port 10/100 Mbps managed Ethernet switch controller designed for embedded networking. As the MII variant of the KSZ8993 family (originating from Micrel, now part of Microchip), it connects to external Ethernet PHYs over a Media Independent Interface, enabling designers to choose the exact PHY devices and magnetics that fit their cost, power, and environmental needs. Operating from a single 3.3 V rail and offered in a 128‑lead PQFP for surface mounting, the KSZ8993MI targets compact, reliable networked products in industrial and consumer segments.

At‑a‑Glance

• Brand: Microchip Technology
• MPN: KSZ8993MI
• Category: Ethernet Switch ICs
• Switch type: Managed
• Number of ports: 3
• Per‑port data rate: 10/100 Mb/s
• Host/PHY interface: MII (Media Independent Interface)
• Integrated PHYs: None (requires external PHYs)
• Supply voltage: 3.135 V to 3.465 V (nominal 3.3 V)
• Package: PQFP‑128
• Mounting: Surface mount
• Pin count: 128
• Ethernet standards: IEEE 802.3 (10BASE‑T), IEEE 802.3u (100BASE‑TX)

Overview and Value Proposition

The Microchip Technology KSZ8993MI provides a compact switching fabric for three 10/100 ports while intentionally omitting integrated PHYs. This separation is valuable in embedded and industrial systems where designers need:

• Flexibility in PHY selection. You can pair the switch core with PHYs that match specific EMI, ESD, temperature, power, or cost targets, or with PHYs that offer specialized features your application needs.
• Clear board‑level partitioning. With external PHYs, magnetics, and RJ‑45 connectors placed at the board edge, the KSZ8993MI can sit more centrally for optimal routing and thermal balance.
• A single 3.3 V supply domain. The device fits naturally into modern digital designs where 3.3 V logic is prevalent, simplifying the power architecture.

Because it is a managed switch, the KSZ8993MI enables register‑level configuration and control of port behavior. While specific feature sets (for example VLAN, QoS, or IGMP snooping) are not listed in the provided data and should be verified in the datasheet, the “managed” designation indicates it is intended for designs requiring determinism and runtime control rather than a purely unmanaged plug‑and‑play topology.

Key Specifications

• Core function: 3‑port 10/100 managed Ethernet switch
• Ethernet conformance: IEEE 802.3 (10BASE‑T) and IEEE 802.3u (100BASE‑TX)
• Ports: 3
• Data rate per port: 10 or 100 Mb/s
• Interface to PHYs: MII
• Integrated PHYs: None; external PHYs required
• Supply voltage range: 3.135 V to 3.465 V
• Package: 128‑lead PQFP
• Mounting type: Surface mount (SMT)
• Category: Ethernet Switch ICs

Items not specified in datasheet (based on the provided data):

• Advanced management features (e.g., VLAN, QoS): Not specified in datasheet
• Power consumption (idle/transmit/sleep): Not specified in datasheet
• Operating temperature range: Not specified in datasheet
• Environmental/RoHS status: Not specified in datasheet
• Lifecycle status and direct replacements: Not specified in datasheet

Architecture and Design Considerations

External PHY topology with MII

KSZ8993MI communicates with external PHYs using the MII interface. In a typical 3‑port design, each MAC port of the switch connects to a corresponding external PHY, which then interfaces through magnetics to the RJ‑45 connector. This modularity allows you to:

• Select PHYs optimized for low power or extended temperature operation.
• Use PHYs with integrated features such as cable diagnostics or specific ESD performance, if required by the application.
• Place PHYs physically close to the magnetics and connectors to minimize EMI and maintain signal integrity, while locating the KSZ8993MI for optimal routing.

Follow the timing and signal integrity requirements in the KSZ8993MI datasheet and in the chosen PHY datasheets. While MII is a standardized interface, ensure that clocking, skew, and trace impedances meet the combined budget across the switch, PHY, and PCB interconnect.

Power rails and decoupling

The device operates from a single 3.3 V supply. Good practice includes:

• Providing local high‑frequency decoupling at every power pin using a mix of small (e.g., 0.1 µF) and mid‑value capacitors close to the leads.
• Using a low‑impedance power distribution plane and placing bulk capacitance near the device cluster (switch plus PHYs) to handle burst currents.
• Paying attention to return current paths—especially around high‑speed MII traces—to reduce ground bounce and radiated emissions.

Exact current consumption and rail partitioning were not provided and should be verified against the official datasheet and reference designs.

Clocking and reset

Switch controllers and PHYs require stable reference clocks and well‑defined reset sequences. Align clock sources (crystal or oscillator) and reset timing across the KSZ8993MI and the selected PHYs in accordance with their datasheets. If supervisory ICs or power‑good indicators are used, ensure that reset deassertion occurs after rails are stable and clocks are valid.

Layout, EMI, and ESD

• Keep MII signal groups length‑matched within each bus to maintain timing margins.
• Route differential pairs between PHYs and magnetics with controlled impedance, short stubs, and solid return paths.
• Isolate noisy digital regions from sensitive analog front ends in the PHYs and magnetics.
• Provide adequate surge and ESD protection at the RJ‑45 interface per system‑level requirements.

System management

The KSZ8993MI is identified as a managed switch. The management interface and register access method are not specified in the provided data. Before committing to a design, confirm:

• Control/management method (e.g., register interface, strapping options).
• Default port states, auto‑negotiation options, and any per‑port configuration capabilities.
• Whether features such as VLANs, QoS, or port mirroring are available and how they are configured, if required by your application.

Applications

• Embedded Ethernet switching
• Industrial networking equipment
• Consumer/SOHO network devices
• MCU/MPU‑based systems requiring 3‑port 10/100 switching

These use cases benefit from the device’s external‑PHY approach. For example, an industrial controller can deploy robust, extended‑temperature PHYs with the KSZ8993MI switch core, while a cost‑optimized consumer design can choose mainstream PHYs to meet tight BOM targets.

Compliance and Standards

• IEEE 802.3 (10BASE‑T): Supported
• IEEE 802.3u (100BASE‑TX): Supported

Environmental and safety compliance:

• RoHS/REACH: Not specified in datasheet
• Other environmental certifications: Not specified in datasheet

For product compliance documentation (e.g., material declarations or environmental certificates), consult Microchip’s product page or contact an authorized distributor.

Lifecycle and Sourcing Guidance

• Lifecycle status: Not specified in datasheet
• Official replacements or next‑generation parts: Not specified in datasheet

Recommendations:

• Check the Microchip Technology KSZ8993 product page for current lifecycle status, errata, and any migration guidance.
• If your program requires long‑term availability, discuss lifecycle planning with your distributor or Microchip sales. Consider second‑source strategies for external PHYs and magnetics to minimize risk.
• Validate availability of PQFP‑128 assembly capability with your EMS partner, including stencil design and package coplanarity requirements for consistent yields.

Inventory notes:

• Inventory quantity in the provided data is 0. Always verify current stock, lead times, and minimum order quantities with authorized channels.

Ordering and Packaging

• Manufacturer: Microchip Technology (formerly Micrel for this switch family)
• Part number (MPN): KSZ8993MI
• Package: PQFP‑128
• Mounting: Surface mount
• Packaging format: Not specified in datasheet

If your production flow requires tape‑and‑reel, trays, or specific MSL handling, confirm the exact packing option and moisture sensitivity details from the datasheet and ordering guide prior to release.

Integration Checklist

Use this checklist to shorten design cycles and reduce back‑and‑forth during reviews:

• Confirm port count and speed: 3 ports at 10/100 Mb/s each.
• Select external PHYs and verify MII compatibility and timing with KSZ8993MI.
• Plan magnetics, RJ‑45 connectors, and ESD/surge components meeting system‑level requirements.
• Validate power rail: 3.135 V to 3.465 V; size decoupling and bulk capacitance per board‑level analysis.
• Review management/control method and any configuration straps or registers needed at boot.
• Check environmental requirements (temperature range, humidity, shock/vibration) against device and PHY capabilities; specifics are not specified in datasheet and must be verified.
• Evaluate EMI/EMC strategy: layout constraints, return paths, ground strategy, and common‑mode chokes as required.
• Confirm mechanical fit for PQFP‑128: component keep‑outs, rework access, and placement tolerances.
• Document test strategy: production test for each port link, auto‑negotiation behavior, and functional switching validation.

Why Choose the Microchip Technology KSZ8993MI?

• Modularity: Pair with the PHYs that precisely match your environmental and cost profile.
• Simplicity: Single 3.3 V operation aligns with common embedded power architectures.
• Footprint: PQFP‑128 enables reliable SMT assembly with standard processes in many EMS lines.
• Standards compliance: Designed for IEEE 802.3/802.3u interoperability at 10/100 Mb/s.

These strengths make the KSZ8993MI a solid foundation for compact 3‑port switches in gateways, HMIs, factory automation nodes, and home/office networking devices.

Frequently Asked Questions (FAQs)

Q: Is the KSZ8993MI a managed or unmanaged switch?
A: Managed. It is identified as a 3‑port 10/100 managed Ethernet switch.

Q: How many ports does the Microchip Technology KSZ8993MI support?
A: Three ports at 10/100 Mb/s each.

Q: Does the KSZ8993MI include integrated PHYs?
A: No. It requires external Ethernet PHYs and communicates with them over MII.

Q: What supply voltage does the KSZ8993MI require?
A: 3.135 V to 3.465 V (nominal 3.3 V).

Q: Which Ethernet standards does it support?
A: IEEE 802.3 (10BASE‑T) and IEEE 802.3u (100BASE‑TX).

Q: What package is the KSZ8993MI available in?
A: 128‑lead PQFP for surface‑mount applications.

Q: Are features like VLAN or QoS supported?
A: Not specified in the provided data. Review the official datasheet for detailed managed feature sets.

Q: Is the KSZ8993MI RoHS compliant?
A: Not specified in the datasheet information provided. Check the product page or compliance documentation.

Q: What is the lifecycle status of this part?
A: Not specified in the provided data. Verify on the Microchip product page or with an authorized distributor.

Resources

• Product page: https://www.microchip.com/en-us/product/ksz8993
• Datasheet: https://www.microchip.com/en-us/product/ksz8993

Note: The content above is based on the structured data provided. For complete electrical characteristics, timing, feature set, and pin‑level details, always consult the official Microchip Technology KSZ8993MI datasheet and associated application notes.