KSZ8842-PMQL - 2-Port 10/100 PCI Ethernet Switch | Microchip
部品番号: KSZ8842-PMQL ✓ 生産中KSZ8842-PMQL 概要
An Ethernet switch is a Layer 2 network device that forwards Ethernet frames between connected nodes while using MAC-address learning to reduce unnecessary traffic. Within the network hierarchy, the KSZ8842-PMQL is an Ethernet interface IC and network interface controller that connects a PCI host processor to two 10/100 Base-TX ports. Its managed-switch architecture supports centralized port control, status monitoring, and traffic management in embedded industrial, communications, and legacy PCI systems.
Key features include two integrated 10/100 Ethernet ports, a 32-bit PCI interface operating at 33 MHz, IEEE 802.3u compliance, an integrated DMA engine, and a low-power operating design. The PQFP package provides 128 accessible package positions and uses leaded technology for compatibility with established PCI motherboard and embedded-controller assemblies. An industrial-temperature ordering option, KSZ8842-PMQLI, extends the family for applications requiring extended temperature operation.
Architecturally, the KSZ8842-PMQL belongs to the KSZ8842 fourth-generation integrated Layer 2 switch family. Separate PCI and non-PCI implementations allow designers to match the host interface to the platform, while the PMQL version retains the 32-bit PCI processor connection. The integrated DMA engine assists efficient packet transfer between the PCI host and switch ports, reducing the processing burden associated with moving Ethernet traffic through host memory.
Typical applications include PCI-based industrial controllers, embedded communications appliances, test and measurement systems, legacy PCI server equipment, and custom network interface cards. The device is particularly suitable when two copper Ethernet ports are required without adding an external two-port switch. Designers must also verify the host platform's supported PCI electrical characteristics, bus width, clocking, and software configuration model before releasing a new design.
For a new design, route each differential Ethernet pair through a controlled-impedance layout, keep the PHY and magnetics interface routing compact, and follow the manufacturer's reference layout for power, ground, reset, and clock connections. Because this is a legacy PCI bridge with a large leaded package, confirm long-term sourcing and lifecycle status with Microchip before committing to high-volume production.
This page combines the exact manufacturer and distributor identification for KSZ8842-PMQL with package, interface, application, and procurement guidance. It also distinguishes the PCI implementation from related non-PCI KSZ8842 members and identifies the temperature-graded PMQLI counterpart for industrial design reviews.
ドロップイン代替品: KSZ8842-PMQL — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
KSZ8842-PMQLI
✅ ドロップイン📋 参考代替品（カタログ未掲載）
KSZ8842-PMQL 最大定格＆電気的特性
| Product Type | Managed two-port Ethernet switch with PCI interface |
| Number of Ethernet Ports | 2 ports |
| Ethernet Speed | 10/100 Base-TX |
| CPU Interface | Generic 32-bit PCI |
| PCI Clock Frequency | 33 MHz |
| Network Layer | Layer 2 |
| Ethernet Standard | IEEE 802.3u |
| Switch Architecture | Fully managed two-port switch |
| DMA Engine | Integrated |
| Power Management | Low-power consumption |
| パッケージ | 128-pin PQFP, 14 mm x 20 mm |
| 実装タイプ | Surface mount |
| Industrial-Grade Variant | KSZ8842-PMQLI |
| Industrial Variant Availability | Available from Q1 2006 |
| Manufacturer | Microchip Technology |
| Original Manufacturer | Micrel Semiconductor |
| Maximum Link Speed | 100 Mb/s |
KSZ8842-PMQL 128-pin pqfp, 14 mm x 20 mm ピン配置ガイド
KSZ8842-PMQL (128-pin pqfp, 14 mm x 20 mm パッケージ) のピン配置。 ピン番号、機能、接続図はメーカーのデータシートで定義されています。正確なフットプリントとはんだ付けのガイドラインについては、データシートを参照してください。
詳細なピン配置データはありません: KSZ8842-PMQL.
詳細は データシート をご参照ください。
主な用途
KSZ8842-PMQL の用途: 6 件s: PCI Industrial Controller, Embedded Communications Appliance, PCI Network Interface Card, Test and Measurement Instrument, Legacy PCI Server Connectivity, Embedded Ethernet Media Gateway.
PCI Industrial Controller
The KSZ8842-PMQL fits a PCI industrial controller that needs two integrated 10/100 Ethernet ports instead of a processor with a single embedded MAC plus an external switch. Its 32-bit, 33 MHz PCI interface connects directly to the host bus, while the integrated DMA engine supports efficient packet movement between host memory and the two switched ports. IEEE 802.3u compliance provides a defined Fast Ethernet foundation for supervisory, configuration, and process-control networks. The two-port managed-switch arrangement also permits a compact controller architecture with one upstream link and one downstream equipment link. Use KSZ8842-PMQLI when the enclosure requires the industrial-temperature grade of the same PQFP family.
おすすめ
Embedded Communications Appliance
The KSZ8842-PMQL is suitable for embedded communications equipment that bridges a PCI host processor to two copper Ethernet networks. A managed Layer 2 switch can support two endpoints on one card, reducing the need for a separate Ethernet switch and simplifying physical implementation. The generic 32-bit, 33 MHz PCI interface provides a defined host connection, and the integrated DMA engine helps the host transfer frames without handling every Ethernet transaction in software. The 128-pin PQFP package is relatively large, so designers should reserve adequate board area and verify assembly capability. For extended-temperature installations, evaluate KSZ8842-PMQLI after confirming the complete system's thermal requirements.
おすすめ
PCI Network Interface Card
The KSZ8842-PMQL supports a two-port PCI network interface card for legacy embedded platforms that need independent 10/100 Ethernet connections. Two integrated switched ports can consolidate network functions onto one PCI card while preserving a conventional processor-interface architecture. The 32-bit, 33 MHz PCI connection supports integration with compatible host systems, while the integrated DMA engine assists efficient frame transfer. Board design work must follow the manufacturer's reference layout for the PQFP footprint, power distribution, Ethernet differential pairs, and magnetics interface. Before layout release, verify the target PCI platform's clock, termination, interrupt, and driver requirements against the manufacturer datasheet.
おすすめ
Test and Measurement Instrument
The KSZ8842-PMQL can serve a PCI-based test or measurement instrument that must communicate through two isolated Fast Ethernet ports. One port may connect to a supervisory workstation while the other reaches an instrument or device under test, and the managed Layer 2 switch provides a more integrated implementation than two unrelated Ethernet interfaces. The device's 10/100 Base-TX capability and IEEE 802.3u compliance align with legacy test networks. Its integrated DMA engine can improve host-side packet handling, but the host software must correctly initialize the switch registers. Confirm EMC, temperature, grounding, and isolation requirements for the finished instrument before selecting the standard or industrial ordering option.
おすすめ
Legacy PCI Server Connectivity
おすすめ
Embedded Ethernet Media Gateway
The KSZ8842-PMQL fits an embedded media or protocol-conversion gateway that connects a PCI processor to two copper networks. The managed switch permits one external uplink and one local equipment port without requiring a discrete two-port switch beside the processor. Its 10/100 Ethernet capability suits legacy control and communications networks, while the integrated DMA engine supports efficient data movement in gateway designs. The large 128-pin PQFP footprint requires deliberate placement to simplify power routing and keep Ethernet traces away from sensitive signals. Confirm that the host software supports the KSZ8842 register set and that the gateway's thermal environment falls within the selected PMQL ordering grade.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: KSZ8842-PMQL — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | KSZ8842-PMQLI |
|---|---|---|
| Package | 128-PQFP (14x20 mm) | 128-PQFP (14x20 mm) |
| Brand | Microchip Technology | Microchip Technology |
| Product Function | Managed two-port Ethernet switch with PCI interface | Managed two-port Ethernet switch with PCI interface |
| Number of Ethernet Ports | 2 ports | 2 ports |
| Ethernet Speed | 10/100 Base-TX | 10/100 Base-TX |
| CPU Interface | Generic 32-bit PCI at 33 MHz | Generic 32-bit PCI at 33 MHz |
| Temperature Grade | Standard grade | Industrial-temperature grade |
| Ethernet Standard | IEEE 802.3u | IEEE 802.3u |
| DMA Engine | Integrated | Integrated |
| Power Features | Low-power consumption | Low-power consumption |
主な差別化要因
- Two integrated switched Fast Ethernet ports on one PCI component （vs KSZ8041RNL)
- Direct legacy PCI host connectivity （vs KSZ8842-16MVIL)
- Industrial-temperature counterpart retains the same mechanical footprint （vs KSZ8842-PMQLI)
設計ノート
Follow the manufacturer's reference layout for the 128-pin PQFP footprint and place the device so its power and ground connections have short, low-impedance paths. The 14 mm by 20 mm body demands careful escape routing, particularly if Ethernet differential pairs and PCI signals must leave the device in constrained directions. Use the pin-description table in the Microchip datasheet to assign every package position, and verify the land pattern against the actual PMQL drawing before releasing artwork.
Keep the Ethernet differential pairs short, impedance-controlled, and continuously referenced to a solid ground plane. Route each port toward its magnetics or external network interface without introducing test pads or unrelated high-speed traces into the pair path. Separate switching-power stages and inductors from the Ethernet and PCI routing, and place decoupling capacitors at the device pins according to the manufacturer's reference design. These steps reduce radiated emissions, insertion loss, and susceptibility to ground bounce.
Do not treat KSZ8842-PMBL as a drop-in substitute for KSZ8842-PMQL because the former uses an LFBGA package and the latter uses a 128-pin PQFP. Likewise, the KSZ8842-16M and KSZ8842-32M non-PCI members are not direct replacements for the PCI PMQL device. Validate PCI electrical behavior, firmware initialization, switch-register configuration, reset sequencing, and interrupt handling before committing either the standard or industrial-temperature ordering option to production.
コンプライアンス情報
The Ethernet interface is not an automotive-qualified product in the cited manufacturer material. RoHS, REACH, lead-free, halogen-free, and conflict-minerals status were not identified in the cited product pages and should be confirmed with Microchip for the exact ordering code.
