KSZ8864CNXI - 4-Port 10/100 Ethernet Switch | Microchip
MPN： KSZ8864CNXI ✓ 啟用中KSZ8864CNXI 概覽
An Ethernet switch is a Layer 2 network semiconductor that forwards Ethernet frames between multiple physical ports according to MAC addresses. The KSZ8864 family belongs to the hierarchy of Ethernet interface controllers, network interface controllers, integrated circuits, and semiconductors. Its four-port managed architecture allows one embedded processor to connect through two MAC interfaces while the switch handles traffic between attached nodes, reducing the number of physical network interfaces required by the host system.
The KSZ8864 supports 10/100 Mbps operation and provides MII and RMII interfaces for connection to a network processor, microcontroller, or application-specific processor. MII offers separate parallel paths for transmit and receive data, while RMII uses a reduced pin interface suitable for designs where connector count and board area are important. The manufacturer describes the family as optimized for cost-sensitive switch systems, with on-chip termination, low power consumption, and a small package intended to reduce system cost.
The device integrates two MAC interfaces and four Ethernet ports in one network IC. This consolidation can shorten the design path for industrial control, automotive networking, embedded appliances, communications equipment, and network bridges. The KSZ8864 family is listed by the manufacturer as AEC-Q100 automotive qualified, although orderable suffix and grade details should be confirmed for each specific package configuration before use in a production vehicle design.
Typical Ethernet designs use the KSZ8864 as the central Layer 2 switching element, with external magnetics and RJ45 or other network connectors on the port side. The host processor connects through one of the MII or RMII interfaces. Configuration and status information can be handled through the management interface, allowing firmware to control port parameters and monitor link state. Network isolation, instrumentation, and embedded service-port products are also natural fits because four ports can replace several discrete Ethernet interface arrangements.
When designing around the KSZ8864CNXI, preserve the manufacturer’s recommended decoupling and layout guidance and account for the exposed-pad thermal and electrical requirements of the 64-QFN package. Keep Ethernet differential routing controlled, provide the specified clocking and interface voltage levels, and verify MII or RMII signal timing at the host boundary. The MII and RMII options are not automatically interchangeable; the host SoC, clock architecture, and PCB design must support the selected interface.
This product page consolidates the manufacturer’s device identity, package information, interface capabilities, application guidance, cross-reference findings, and engineering-oriented comparison data. It also identifies where a strict, board-compatible drop-in substitute is not established, helping engineers make sourcing decisions without confusing a related ordering suffix with a functionally different switch.
直接替換替代品，適用於 KSZ8864CNXI — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： KSZ8864CNXI （相同外形與佔位） — 差異在於 Automotive Qualification, Product Type.
KSZ8864CNXIA
✅ 直接替換📋 參考替代品（不在目錄中）
KSZ8864CNXI 最大額定值與電氣特性
| Product Type | Layer 2 managed Ethernet switch |
| Number of Ethernet Ports | 4 ports |
| Ethernet Data Rate | 10/100 Mbps per port |
| MAC Interface Count | 2 MAC interfaces |
| Host Interface | MII or RMII |
| Layer | Layer 2 |
| On-Chip Termination | Supported |
| 供應電壓 | 3.3 V |
| Automotive Qualification | AEC-Q100 |
| Package Type | 64-QFN |
| Package Dimensions | 8 mm x 8 mm x 0.9 mm |
| 安裝類型 | Surface mount |
| Delivery Format | Tray |
| RoHS 狀態 | Compliant |
| Ethernet PHY Compliance | IEEE 802.3 |
KSZ8864CNXI 8 mm x 8 mm x 0.9 mm 腳位配置指南
KSZ8864CNXI（8 mm x 8 mm x 0.9 mm 封裝）的腳位配置。 腳位編號、功能與連接圖定義於製造商資料手冊中。請參閱該手冊以取得確切的封裝尺寸與焊接指引。
無詳細腳位定義資料： KSZ8864CNXI.
請參閱 資料表 以查看完整腳位配置。
典型應用
KSZ8864CNXI 適用於 6 應用s: Embedded Industrial Ethernet Gateway, Automotive Network Gateway, Network Equipment Port Concentrator, Industrial Test and Measurement Instrument, Embedded Appliance Communication Hub, Networked Sensor and Control Panel.
Embedded Industrial Ethernet Gateway
The KSZ8864CNXI fits an embedded industrial gateway that must consolidate several 10/100 Mbps Ethernet links into one compact networking device. Its four-port Layer 2 switch, two MAC interfaces, and MII or RMII connectivity allow the host processor to supervise traffic while integrated on-chip termination supports a space-conscious implementation. The 64-QFN 8 mm by 8 mm package reduces board area compared with discrete switching arrangements, while the managed architecture provides a practical foundation for port configuration and link monitoring. Industrial equipment should also be checked against the device’s specified operating-temperature range and EMC requirements.
推薦
Automotive Network Gateway
The KSZ8864CNXI is suitable for a compact automotive Ethernet gateway designed around a 10/100 Mbps Layer 2 network. The four switch ports can connect multiple vehicle network nodes, while the two MAC interfaces and selectable MII or RMII connectivity provide links to a host controller. Microchip Technology identifies the KSZ8864 family as AEC-Q100 qualified, making automotive qualification a central selection criterion. The integrator must confirm the exact suffix requirements, operating-temperature grade, isolation strategy, and external magnetics appropriate for the target vehicle platform before production release.
推薦
Network Equipment Port Concentrator
The KSZ8864CNXI can serve as the switching element in a compact port concentrator, media bridge, or network-attached service appliance. Four 10/100 Mbps ports provide simultaneous Ethernet connectivity, while the Layer 2 managed architecture allows a host processor to handle configuration and status information. Its two MAC interfaces give the system designer options for host attachment through MII or RMII, depending on processor support and available board space. The small 64-QFN footprint also leaves room for connectors, magnetics, and power circuitry in equipment where front-panel space is constrained.
推薦
Industrial Test and Measurement Instrument
The KSZ8864CNXI is appropriate for a networked test instrument or data-acquisition system that needs several service and communication ports. The four 10/100 Mbps switch ports can connect an instrument controller, service interface, and peripheral equipment, while MII or RMII connectivity lets the switch work with the instrument’s embedded processor. The compact 64-QFN package supports dense front-end hardware, and the managed Layer 2 function can assist with port status monitoring. System designers should follow the manufacturer’s clocking, decoupling, differential-pair, and exposed-pad layout guidance to preserve Ethernet performance.
推薦
Embedded Appliance Communication Hub
The KSZ8864CNXI can serve as the communication hub in an embedded appliance that links multiple local Ethernet devices to a higher-level controller. Its four 10/100 Mbps ports and two MAC interfaces provide a scalable network topology without requiring four separate host-facing controllers. MII offers a conventional parallel interface, while RMII can reduce connection count when supported by the host processor. The integrated on-chip termination and compact 8 mm by 8 mm QFN footprint are valuable in appliances with limited PCB area. Thermal and signal-integrity validation should be completed with the exact external magnetics and connector implementation.
推薦
Networked Sensor and Control Panel
The KSZ8864CNXI fits a networked sensor or control panel that must expose multiple 10/100 Mbps connections while retaining a compact controller section. Four switch ports can connect sensors, remote I/O modules, or service equipment to a supervisory processor, and the Layer 2 management functions support controlled network behavior. The two MAC interfaces allow flexible host integration through MII or RMII, while the 64-QFN package helps limit connector spacing requirements. For a smart-building or IoT-related product, confirm the operating-temperature range, Ethernet isolation needs, firmware feature set, and compliance requirements for the target installation environment.
推薦
推薦產品摘要
工程參考資料，適用於 KSZ8864CNXI — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | KSZ8864CNXIA |
|---|---|---|
| Manufacturer | Microchip Technology | Microchip Technology |
| Package | 64-QFN (8x8) | 64-QFN (8x8) |
| Product Type | Layer 2 managed Ethernet switch | Layer 2 managed Ethernet switch |
| Ethernet Port Count | 4 ports | 4 ports |
| Data Rate | 10/100 Mbps | 10/100 Mbps |
| MAC Interface Count | 2 | 2 |
| Host Interface | MII or RMII | MII or RMII |
| On-Chip Termination | Supported | Supported |
| Automotive Qualification | KSZ8864 family: AEC-Q100 | KSZ8864 family: AEC-Q100 |
主要差異化特點
- Combines four switch ports with two host-side MAC interfaces (對比KSZ8864CNXIA)
- Compact Layer 2 integration for embedded networking (對比KSZ8864CNXIA)
- Automotive-oriented family qualification (對比KSZ8864CNXIA)
設計說明
Follow the manufacturer land pattern for the 64-QFN package and connect the exposed pad according to the datasheet layout recommendation. Place input and output decoupling capacitors close to their associated supply pins, minimize loop area, and provide adequate via coverage beneath the exposed pad. The package is 8 mm by 8 mm, but its 64-pin construction still requires careful escape routing before the Ethernet differential pairs are routed.
Route Ethernet differential pairs as controlled-impedance, tightly coupled nets with continuous reference planes and minimal stubs. Keep switching or high-current paths away from MII and RMII signals, especially clock and data nets. The MII interface requires a broader parallel bus, whereas RMII reduces connection count; in either case, verify host timing and source-synchronous routing against the manufacturer interface requirements.
Do not substitute a delivery suffix without confirming the complete ordering configuration. The KSZ8864CNXI-TR is associated with tape-and-reel delivery, while the KSZ8864CNXI listing is associated with tray delivery. Check temperature grade, automotive qualification, package dimensions, and exposed-pad requirements in the Microchip ordering table. Use the manufacturer datasheet for the complete pinout rather than inferring connections from another Ethernet device.
Design the 3.3 V supply network for the device’s specified operating-current limits and startup behavior. Use the electrical-characteristics table for current under the selected port activity, interface mode, and temperature. Provide stable clocking and observe power-on sequencing requirements, because an incorrect supply ramp or unstable reference can affect switching, management access, and host-interface operation.
合規資訊
The Newark listing explicitly identifies the KSZ8864CNXI as RoHS compliant. Microchip Technology identifies the KSZ8864 family as AEC-Q100 automotive qualified. Other environmental and material-compliance declarations require confirmation from the manufacturer.
