KSZ8842-PMBL - 2-Port 10/100 Ethernet Switch | Microchip
MPN： KSZ8842-PMBL ✗ 停產KSZ8842-PMBL 概覽
An Ethernet switch is a network-semiconductor device that connects multiple physical network nodes while forwarding Ethernet frames according to Layer 2 addresses. The KSZ8842 belongs to the Ethernet switch hierarchy and integrates physical-layer transceivers, frame processing, port management, and a host-facing peripheral bus within one IC. Its PCI interface allows a processor or embedded controller to configure the switch, manage traffic, and exchange data with the connected Ethernet ports without requiring a separate external Ethernet controller.
The manufacturer datasheet identifies the KSZ8842-PMQL/PMBL as the first fully managed two-port switch with a 32-bit, 33 MHz PCI processor interface. The device is compliant with IEEE 802.3u, supports 10/100 Base-T networking, and includes an integrated DMA engine for efficient host data movement. Its four-generation integrated Layer 2 switch architecture supports managed switching functions while reducing the component count of embedded Ethernet designs.
The KSZ8842-PMBL is intended for compact PCI-based embedded systems where two Ethernet links are needed close to the host processor. Typical signal paths include industrial control equipment, embedded servers, communication appliances, test systems, and PCI expansion products. A 122 mA supply current value is identified for this device, making system-level power budgeting important when two ports operate continuously.
The principal design consideration is the 100-LFBGA footprint. The board must provide the exact ball layout defined by the manufacturer package drawing and must accommodate the PCI, clock, power, reset, and Ethernet magnetics interfaces. Review the ordering information and pin-description tables in the manufacturer datasheet before assigning ball assignments or preparing the PCB footprint.
The KSZ8842-PMBL is also the base commercial-temperature ordering code within the PMQL/PMBL PCI-interface family. The PMBL suffix identifies the LFBGA package, while the PMQL suffix identifies a different package. Industrial-temperature ordering variants include the -AM designation; verify the exact suffix, grade, and shipping configuration when substituting parts.
This product page consolidates the known switch, interface, package, and ordering information with engineering-focused application guidance, replacement considerations, and a parameter comparison. It also distinguishes electrical or temperature-grade alternatives from packaging-only order codes so engineers can assess PCB compatibility before redesigning an existing LFBGA design.
直接替換替代品，適用於 KSZ8842-PMBL — 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。
KSZ8842-PMBL-AM
✅ 直接替換📋 參考替代品（不在目錄中）
KSZ8842-PMBL-AM-TR
✅ 直接替換📋 參考替代品（不在目錄中）
KSZ8842-PMBL 最大額定值與電氣特性
| Product Type | Managed two-port Ethernet switch |
| Ethernet Port Count | 2 ports |
| Ethernet Speed | 10/100 Base-T |
| Host Interface | Generic PCI interface |
| Host Bus Width | 32 bit |
| PCI Clock Frequency | 33 MHz |
| Switching Architecture | Integrated Layer 2 switch |
| DMA Engine | Integrated |
| 供應電流 | 122 mA |
| IEEE Standard | IEEE 802.3u |
| 封裝 | 100-LFBGA, 9 x 9 mm |
| 腳位數 | 100 pins |
| 安裝類型 | Surface mount |
| CPU Interface Family | PCI |
| Low-Power Feature | Low-power consumption |
| Industrial-Temperature Variant | KSZ8842-PMQLI/PMBL-AM |
KSZ8842-PMBL 100-lfbga, 9 x 9 mm 腳位配置指南
KSZ8842-PMBL（100-lfbga, 9 x 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： KSZ8842-PMBL.
請參閱 資料表 以查看完整腳位配置。
典型應用
KSZ8842-PMBL 適用於 6 應用s: Embedded PCI Network Controller, Industrial Control Ethernet Gateway, PCI Communication Appliance, Embedded Test and Measurement Equipment, Network Monitoring Gateway, Compact Embedded Server Interface.
Embedded PCI Network Controller
The KSZ8842-PMBL fits an embedded PCI networking controller that needs two physical Ethernet connections close to a host processor. Its generic 32-bit, 33 MHz PCI interface supports host configuration and data transfer, while the integrated DMA engine is intended to move network data efficiently. The two managed 10/100 Base-T ports are compliant with IEEE 802.3u, allowing one compact IC to replace separate physical-layer and switching functions. The designer must route the PCI bus correctly, follow the 100-LFBGA ball assignments, and allow for the listed 122 mA supply current.
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Industrial Control Ethernet Gateway
The KSZ8842-PMBL can support an industrial control gateway requiring two 10/100 Base-T network connections and a PCI host interface. Managed Layer 2 switching provides a more structured network topology than simple repeater connections, while the integrated DMA engine supports efficient frame handling. For industrial deployment, confirm whether the standard temperature grade is adequate or whether the KSZ8842-PMBL-AM ordering option is required. PCB implementation must preserve the 100-LFBGA footprint, support the 33 MHz PCI interface, and include the external Ethernet magnetics required by the reference design.
推薦
PCI Communication Appliance
The KSZ8842-PMBL is appropriate for a PCI communication appliance that bridges an embedded processor to two wired Ethernet segments. The device combines a 32-bit, 33 MHz PCI processor interface with two IEEE 802.3u-compliant 10/100 Base-T ports, reducing the need for separate Ethernet interface components. Its integrated DMA engine and managed Layer 2 architecture support efficient traffic handling. System designers should budget for the 122 mA listed supply current, follow the manufacturer package and pin descriptions, and implement the approved magnetic-interface network path.
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Embedded Test and Measurement Equipment
The KSZ8842-PMBL can add dual-port Ethernet connectivity to PCI-based test and measurement equipment. Two managed 10/100 ports allow an instrument to connect with a supervisory network and a device under test, while the PCI interface provides a direct path to the host controller. The integration helps reduce board area compared with using multiple discrete Ethernet components. For reliable operation, apply the manufacturer reference layout, account for the listed 122 mA supply current, validate timing at 33 MHz, and provide the external components specified for the 10/100 Base-T interfaces.
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Network Monitoring Gateway
The KSZ8842-PMBL is suited to a compact network-monitoring gateway with two 10/100 Ethernet ports and a PCI-based processing section. The managed Layer 2 switch can support controlled traffic forwarding and segmentation, while the integrated DMA engine helps the host processor handle packet data efficiently. This arrangement is useful for equipment that must observe or bridge two wired network segments without relying on a separate switch ASIC. The implementation must follow the exact 100-LFBGA footprint, include appropriate Ethernet isolation and magnetics, and verify the device's operating limits from the manufacturer datasheet.
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Compact Embedded Server Interface
The KSZ8842-PMBL can provide dual Fast Ethernet connectivity for a compact embedded server or communications module using a PCI bus. The generic 32-bit, 33 MHz PCI interface is appropriate for host-managed designs, and the integrated DMA engine supports efficient data transfer between the processor and the two 10/100 ports. IEEE 802.3u compliance provides a defined basis for the Fast Ethernet ports. Because the LFBGA package concentrates interconnections in a small area, PCB assembly and inspection require careful process control. Follow the manufacturer ball map and reference layout rather than deriving a footprint from a generic 100-pin BGA drawing.
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推薦產品摘要
工程參考資料，適用於 KSZ8842-PMBL — 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 | KSZ8842-PMBL-AM | KSZ8842-PMBL-AM-TR |
|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 100-LFBGA (9 x 9 mm) | 100-LFBGA (9 x 9 mm) | 100-LFBGA (9 x 9 mm) |
| Ethernet Port Count | 2 ports | 2 ports | 2 ports |
| Ethernet Speed | 10/100 Base-T | 10/100 Base-T | 10/100 Base-T |
| Host Interface | Generic 32-bit, 33 MHz PCI | Generic 32-bit, 33 MHz PCI | Generic 32-bit, 33 MHz PCI |
| Temperature Designation | Standard ordering code | Industrial-temperature -AM designation | Industrial-temperature -AM designation |
| IEEE Standard | IEEE 802.3u | IEEE 802.3u | IEEE 802.3u |
主要差異化特點
- Integrated PCI networking in the LFBGA device (對比KSZ8842-PMBL-AM)
- Temperature-grade choice without changing the PCB footprint (對比KSZ8842-PMBL-AM-TR)
- Clear sourcing configuration for reel-based production (對比KSZ8842-PMBL-AM)
設計說明
Base the PCB land pattern on the manufacturer drawing for the 100-LFBGA 9 x 9 mm KSZ8842-PMBL package, not on a generic 100-ball BGA footprint. Confirm ball coordinates, pad dimensions, solder-mask limits, and exposed or routed ground connections against the package drawing. The KSZ8842-PMQL uses PQFP and therefore requires an entirely different footprint.
Route the 32-bit, 33 MHz PCI interface as a controlled-length, contiguous bus and follow the manufacturer's reference layout. Maintain the specified impedance, provide continuous ground references, and avoid splitting planes beneath the switching region. PCI timing margins depend on the complete host, trace, connector, and switch path, so validate the final layout with appropriate signal-integrity analysis.
Estimated: using the listed 122 mA supply current and a nominal 3.3 V rail, the device consumes approximately 0.40 W before accounting for tolerance or external-interface loading. Use this figure only for preliminary budgeting and confirm the actual rail voltage and current limits in the manufacturer datasheet. Place local bypass capacitors according to the reference design and keep switching-current return paths compact.
Do not substitute KSZ8842-PMQL for KSZ8842-PMBL on an existing board because the packages are not interchangeable. Also distinguish the base device, the industrial-temperature -AM option, and the -TR tape-and-reel shipping code. A packaging suffix changes how the component is delivered, while the -AM designation changes the temperature ordering condition; both should be checked before a production release.
合規資訊
The manufacturer datasheet identifies IEEE 802.3u compliance and an industrial-temperature ordering variant, but no RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declaration was identified for this exact ordering code.
