KSZ8864CNXC - 4-Port 10/100 Managed Ethernet Switch | Microchip
料号： KSZ8864CNXC ✓ 量产中KSZ8864CNXC 概述
An Ethernet switch is a network-interface IC that forwards Ethernet frames between connected devices and an upstream controller or network segment. The KSZ8864 belongs to the managed switch, Ethernet interface controller, network interface IC, and semiconductor hierarchy. Its Layer 2 management function provides controlled frame handling at the edge of an embedded network rather than requiring a separate bridge or complex external switching hardware.
Key characteristics include four integrated 10/100 Base-T/TX ports, two MACs with selectable MII or RMII interfaces, on-chip termination, low power consumption, and a 64-QFN package measuring 8 x 8 mm. These characteristics make the device suitable where space, interface count, and system cost are important constraints in industrial, automotive, communications, and embedded-control products.
Technically, the KSZ8864 combines four Fast Ethernet PHYs with managed Layer 2 switching functions and host-facing MAC interfaces in one package. MII provides a parallel interface with separate data paths, while RMII reduces the number of required host-interface signals. The two MACs support designs that need more than one upstream or management connection. According to the Microchip KSZ8864CNX/RMNUB datasheet, the family includes on-chip termination to reduce external component count and support compact 10/100 Mbps switch systems.
Typical applications include industrial Ethernet gateways, vehicle network interfaces, embedded routers, serial-to-Ethernet equipment, industrial controllers, set-top networking, and compact embedded access systems. The device is especially relevant when a design needs four Fast Ethernet ports, two host interfaces, managed Layer 2 behavior, and a small package on the same PCB.
The primary design consideration is interface and power planning. The PCB must route MII or RMII signals according to the selected host-interface mode, provide appropriate decoupling, and preserve controlled-impedance paths where timing or EMI performance matters. Because this is a digital interface IC rather than a power semiconductor, a Safe Operating Area chart is not applicable.
This product overview combines the manufacturer’s switch description, verified package and interface facts, replacement analysis, and practical implementation guidance. It also distinguishes the base device from automotive and temperature-grade ordering variants that can share the same 64-QFN footprint but serve different qualification requirements.
直接替换替代料： KSZ8864CNXC ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： KSZ8864CNXC （相同外形与封装尺寸） ——差异在于 Automotive Qualification, Product Type.
KSZ8864CNXCA
✅ 直接替换📋 参考替代料（不在目录中）
KSZ8864CNXI
✅ 直接替换联系询价
查看数据手册 →KSZ8864CNXC 最大额定值与电气特性
| Product Type | Layer 2-managed 4-port Ethernet switch |
| Number of Ethernet Ports | 4 ports |
| Data Rate per Port | 10/100 Mbps |
| Maximum Aggregate Port Data Rate | 100 Mbps per port |
| Ethernet Media | 10/100 Base-T/TX |
| Number of MACs | 2 MACs |
| Host Interface | MII or RMII |
| Switching Layer | Layer 2 managed switching |
| On-Chip Termination | Supported |
| 封装 | 64-QFN, 8 x 8 mm |
| 安装类型 | Surface mount |
| Automotive Qualification | AEC-Q100 qualified family option |
KSZ8864CNXC 64-qfn, 8 x 8 mm 引脚配置指南
KSZ8864CNXC（64-qfn, 8 x 8 mm 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： KSZ8864CNXC.
请参阅 数据手册 以查看完整引脚配置。
典型应用
KSZ8864CNXC 适用于 6 应用s: Industrial Ethernet Gateway, Vehicle Network Gateway, Embedded Router, Industrial Control Terminal, Serial-to-Ethernet Equipment, IoT Edge Gateway.
Industrial Ethernet Gateway
The KSZ8864CNXC fits an industrial gateway that must consolidate several Fast Ethernet devices behind a host processor. Its four 10/100 Mbps switch ports provide the required edge connectivity, while two MACs supporting MII or RMII allow the gateway to connect to an embedded controller and a management network. The 64-QFN 8 x 8 mm package preserves PCB area in compact controllers, and on-chip termination can reduce the number of external network components. Design the layout around the selected MII or RMII mode, provide local decoupling at the supply pins, and verify Ethernet magnetics and line-side routing against the manufacturer reference circuit.
推荐
Vehicle Network Gateway
The KSZ8864CNXC architecture is suitable for vehicle Ethernet gateway designs requiring four 10/100 Mbps ports and flexible host connectivity. The two MACs can provide parallel MII or reduced-pin RMII links to a vehicle controller, while the managed Layer 2 switch handles local frame forwarding. For production automotive programs, select the KSZ8864CNXCA qualification option when the standard part does not meet the required environmental grade. The 8 x 8 mm 64-QFN footprint also helps preserve board space, although the PCB still requires careful isolation between network interfaces, low-noise supply routing, and validated line-side components.
推荐
Embedded Router
The KSZ8864CNXC can provide the central switching fabric in a compact embedded router that combines multiple wired endpoints with an upstream processor. Four integrated 10/100 Mbps ports reduce the number of separate PHY and switching components, while the two MII or RMII-capable MACs support a flexible uplink arrangement. The managed Layer 2 feature makes the switch useful where local filtering and controlled frame handling are required. In a router design, confirm that the host processor can support the selected MAC interface and clocking scheme, and route the RMII signals over controlled-impedance PCB traces with suitable return paths.
推荐
Industrial Control Terminal
The KSZ8864CNXC is appropriate for an industrial control terminal that connects programmable controllers, sensors, service interfaces, and supervisory equipment over 10/100 Mbps Ethernet. Its four switch ports permit local traffic to remain within the equipment, while the two MACs can connect the terminal to a main controller and a separate diagnostic path. On-chip termination and the compact 64-QFN 8 x 8 mm package reduce board-area and assembly requirements. The design should still isolate Ethernet magnetics and connectors, follow the manufacturer recommended capacitor placement, and provide thermal margin across the full industrial temperature range.
推荐
Serial-to-Ethernet Equipment
The KSZ8864CNXC can support serial-to-Ethernet bridges and protocol gateways that need to expose several wired devices through an embedded network controller. Four 10/100 Mbps ports allow multiple service connections, while two MACs supporting MII or RMII offer options for the host and management paths. This integration is useful when each additional discrete PHY would consume excessive PCB area. Keep the Ethernet line-side filtering and magnetics placement consistent with the manufacturer layout guidance, provide uninterrupted ground and supply planes, and check that the selected package variant matches the equipment’s required temperature grade.
推荐
IoT Edge Gateway
The KSZ8864CNXC can form the wired networking section of an IoT edge gateway that aggregates sensors, controllers, and local services while communicating with a host processor. Its four Fast Ethernet ports provide multiple 10/100 Base-T/TX links, and the two MII or RMII-capable MACs support an efficient uplink or management connection. The 64-QFN 8 x 8 mm package is advantageous in compact gateway hardware. Implement the interface using the manufacturer reference layout, keep switch-related supply and ground distribution continuous, and validate signal timing at the selected RMII clock configuration or the wider MII interface.
推荐
推荐产品汇总
工程参考数据： KSZ8864CNXC ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | KSZ8864CNXCA | KSZ8864CNXI |
|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-QFN (8 x 8 mm) | 64-QFN (8 x 8 mm) | 64-QFN (8 x 8 mm) |
| Ethernet Switch Ports | 4 ports | 4 ports | 4 ports |
| Data Rate | 10/100 Mbps per port | 10/100 Mbps per port | 10/100 Mbps per port |
| Number of MACs | 2 MACs | 2 MACs | 2 MACs |
| Host Interface | MII or RMII | MII or RMII | MII or RMII |
| Switching Layer | Layer 2 managed | Layer 2 managed | Layer 2 managed |
| Automotive Qualification | KSZ8864 family includes an AEC-Q100-qualified option | Automotive ordering option | Industrial-temperature ordering option |
| On-Chip Termination | Supported | Supported | Supported |
关键差异点
- Combines four Fast Ethernet switch ports with two host-facing MACs （对比 KSZ8864CNXCA)
- Supports an automotive-oriented ordering option for production vehicle networking （对比 KSZ8864CNXC)
- Offers an industrial-temperature ordering option without changing the footprint （对比 KSZ8864CNXC)
- Reduces board space for four-port managed Ethernet designs （对比 KSZ8864CNXI)
设计说明
Follow the Microchip KSZ8864 reference layout for the 64-QFN footprint, including exposed-pad connection, via pattern, supply pins, and ground-plane continuity. Place input and output decoupling capacitors close to their associated package pins with short return paths. Because the device contains high-speed digital interfaces and Ethernet PHY circuitry, use a continuous ground plane and avoid splitting the ground reference beneath the switch.
Select either MII or RMII according to the host controller and configure the KSZ8864 for the corresponding interface. For RMII, route clock and data signals as a controlled-impedance group with matched length where the host timing budget requires it; for MII, preserve the wider parallel bus with adequate spacing and short stubs. Check supply and ground distribution at the device rather than relying only on a signal-integrity simulation of the host traces.
Keep the Ethernet line-side network, magnetics, protection devices, and PHY connection area away from sensitive clock, sensor, and processor circuitry. Follow the manufacturer placement guidance for integrated termination and external magnetics to minimize return-path discontinuities. Do not route RMII or MII signals beneath the split regions of magnetic components or across discontinuous plane boundaries, because those discontinuities can create additional timing and emissions problems.
Do not treat the KSZ8864CNXCA and KSZ8864CNXI ordering options as interchangeable without checking environmental and qualification requirements. Both retain the 64-QFN footprint and core switch functions, but the A and I suffixes identify different product-grade choices. Before releasing a PCB, compare the exact package drawing, pin table, temperature range, AEC-Q100 status, and device configuration requirements for the selected ordering code.
合规信息
Microchip identifies the KSZ8864 family as AEC-Q100 qualified. The specific qualification grade and base-part compliance declarations are not stated in the product summaries and must be confirmed for the selected ordering variant.
