LAN9420I-NU - 10/100 Ethernet PCI Controller | Microchip
MPN: LAN9420I-NU ✗ Cuối đờiLAN9420I-NU Tóm tắt
An Ethernet controller is a semiconductor that connects an embedded system to an Ethernet network by combining host-bus interfacing, packet processing, and physical-layer signaling. The LAN9420I-NU belongs to the controller and interface-IC hierarchy, where the PCI interface transfers data with the host, the DMA engine moves packet data, and the integrated PHY communicates over twisted-pair Ethernet cabling.
The controller integrates the functions required for a PCI-based Fast Ethernet node. According to the manufacturer datasheet, these include the PCI Revision 3.0 interface, DMA controller, Ethernet MAC, and 10/100 Ethernet PHY. HP Auto-MDIX simplifies link setup by automatically supporting straight-through and crossover cable connections, reducing the configuration burden in embedded equipment.
Additional integrated resources support system-level networking. The manufacturer documentation identifies a multipurpose 16-bit configurable General Purpose Timer, a Free-Run Counter, a three-pin configurable GPIO or LED interface, and two general-purpose output pins. Control and status functions are accessed through memory-mapped registers, providing a defined software interface for initialization, interrupt handling, DMA operation, and network status monitoring.
Typical uses include embedded PCI systems, industrial control equipment, test and measurement instruments, communications appliances, and legacy computer platforms that require a dedicated Fast Ethernet interface. The integrated 10/100 PHY reduces the external circuit area required for network connectivity, while Auto-MDIX improves deployment flexibility when either straight-through or crossover cabling may be encountered.
Board design must account for the 128-pin VTQFP footprint, separate core and I/O supply domains, high-speed clocks, differential PHY signals, and numerous bypass-capacitor connections. The verified 3.3 V supply indication should be reconciled with every power pin and voltage domain in the manufacturer datasheet and placement checklist before the schematic is released.
This product record combines verified distributor availability, the official Microchip product description, the manufacturer datasheet, and the LAN9420I VTQFP placement checklist. It also separates fully confirmed specifications from parameters requiring engineering review, avoiding unsupported claims about timing, pin-level connectivity, temperature limits, and package variant interchangeability.
Bộ thay thế dễ dàng lắp đặt cho LAN9420I-NU — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với LAN9420I-NU (cùng hình factor và footprint) — khác nhau ở Device Type, Free-Run Counter, Host Interface, Package.
Không có bộ thay thế dễ dàng lắp đặt sẵn có cho sản phẩm này.
Yêu cầu các bộ thay thếLAN9420I-NU Thông số kỹ thuật
| Device Type | 10/100 Base-T Ethernet controller |
| Ethernet Data Rate | 10/100 Mbit/s |
| Host Interface | PCI Local Bus Specification Revision 3.0 |
| Integrated PHY | 10/100 Ethernet PHY |
| Auto-MDIX Support | HP Auto-MDIX |
| DMA Controller | Integrated |
| Ethernet MAC | Integrated |
| General Purpose Timer | 16-bit configurable timer |
| Free-Run Counter | Integrated |
| Configurable GPIO or LED Interface | 3 pins |
| General-Purpose Outputs | 2 pins |
| Register Interface | Memory-mapped control and status registers |
| Power Supply Indication | 3.3 V |
| Hộp | 128-pin VTQFP, 14 mm x 14 mm |
| Kiểu lắp đặt | Surface mount |
Hướng dẫn cấu hình chân LAN9420I-NU 128-pin vtqfp, 14 mm x 14 mm
Cấu hình chân cho LAN9420I-NU (128-pin vtqfp, 14 mm x 14 mm gói). Số thứ tự chân, chức năng và sơ đồ kết nối được xác định trong tài liệu thông số kỹ thuật của nhà sản xuất. Tham khảo nó để biết footprint và hướng dẫn hàn chính xác.
Không có dữ liệu chân cụ thể sẵn có cho LAN9420I-NU.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
LAN9420I-NU phù hợp cho 6 Áp dụngs: PCI Embedded Control Systems, Industrial Ethernet Communication Equipment, Test and Measurement Instruments, Legacy PCI Network Expansion, Communications Appliances, Network-Enabled Embedded Products.
PCI Embedded Control Systems
The LAN9420I-NU fits legacy PCI-based industrial controllers because it combines a PCI Local Bus Specification Revision 3.0 interface, DMA controller, Ethernet MAC, and 10/100 PHY in one device. That integration reduces the number of separate host-interface and network-interface blocks while preserving hardware-assisted packet movement. The documented 16-bit configurable timer, free-run counter, GPIO or LED interface, and two GPO pins can support periodic control tasks and status indication. Engineers should still verify pin-level power domains, clock requirements, timing, and operating-temperature limits against the complete manufacturer documentation before using it in a new design.
Industrial Ethernet Communication Equipment
For industrial communication equipment with an available PCI bus, the LAN9420I-NU provides a consolidated 10/100 Mbit/s network interface. The integrated MAC and PHY eliminate the need for a separate Ethernet transceiver in the base design, while DMA supports efficient host-to-network packet transfer. HP Auto-MDIX is particularly useful in field-deployed equipment because the controller can accommodate straight-through and crossover cable arrangements without a manual MDI/MDI-X configuration. Board-level success still depends on compliant magnetics, controlled-impedance routing, proper PHY power filtering, and validation of the completed Ethernet interface against applicable EMC requirements.
Test and Measurement Instruments
The LAN9420I-NU can serve as the Fast Ethernet connection in PCI-based test and measurement instruments that must transfer results, logs, or control traffic to a host or service network. Its 10/100 Mbit/s rate is sufficient for many configuration and monitoring workflows, while the integrated DMA controller can reduce host CPU involvement in routine packet movement. The configurable timer and free-run counter may assist periodic sampling or status tasks, and the GPIO or LED pins can provide front-panel or diagnostic signaling. Designers must budget CPU, memory bandwidth, interrupt latency, and host-driver resources because the supplied data confirms controller functions but not guaranteed throughput on a specific platform.
Legacy PCI Network Expansion
The LAN9420I-NU is appropriate when an existing PCI platform needs dedicated Fast Ethernet connectivity without adding a separate MAC and PHY subsystem. By integrating the PCI Revision 3.0 interface, DMA controller, Ethernet MAC, and 10/100 PHY, it provides a focused network interface for embedded or legacy expansion systems. HP Auto-MDIX simplifies cabling in mixed laboratory and field environments. The principal limitation is architectural rather than functional: this is a PCI-oriented 10/100 controller, so it does not address platforms requiring USB, PCIe, or non-PCI Ethernet interfaces and should not be assumed to replace a modern high-speed network controller.
Communications Appliances
The LAN9420I-NU can support management, configuration, or service networking in a communications appliance built around a PCI host interface. The 10/100 Ethernet MAC and PHY provide a dedicated network path, while DMA handles packet transfer efficiently. A configurable 16-bit timer and free-run counter are useful for maintenance polling, watchdog-style timing, or periodic control functions, and the three configurable GPIO or LED pins plus two GPO pins broaden the role beyond basic networking. Actual deployment requires validation of driver support, boot behavior, interrupt sharing, power consumption, and thermal performance because these host-platform details are not quantified in the supplied verified data.
Network-Enabled Embedded Products
The LAN9420I-NU can add wired network connectivity to a PCI-based embedded product requiring 10/100 Mbit/s throughput. The integrated MAC, PHY, and DMA controller provide the essential packet-processing path, while Auto-MDIX improves cabling flexibility. For products with remote monitoring, configuration, or data-logging functions, the dedicated Ethernet interface avoids sharing an existing serial or low-speed management link. Designers should confirm the controller’s operating-temperature grade, power sequencing, clock tolerance, and driver model for the target processor. The verified package is a 128-pin VTQFP, so adequate fan-out routing and assembly-plan review are essential.
Dữ liệu tham khảo kỹ thuật cho LAN9420I-NU — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này |
|---|---|
| Package | 128-pin VTQFP, 14 mm x 14 mm |
| Brand | Microchip Technology |
| Device Type | 10/100 Base-T Ethernet controller |
| Ethernet Rate | 10/100 Mbit/s |
| Host Interface | PCI Local Bus Specification Revision 3.0 |
| Integrated PHY | 10/100 Ethernet PHY with HP Auto-MDIX |
| DMA Controller | Integrated |
| Configurable Timer | 16-bit multipurpose General Purpose Timer |
| GPIO and GPO Resources | 3-pin configurable GPIO/LED interface and 2 GPO pins |
Bảo phân biệt quan trọng
- Integrated Fast Ethernet subsystem (vsTSB43AB21AIPDTEP)
- On-chip system timing and I/O resources (vsTSB43AB22APDT)
- Automatic cabling flexibility (vsTSB43AB21APDT)
Ghi chú thiết kế
Use the official LAN9420I VTQFP placement checklist together with the full datasheet before releasing the PCB. The checklist specifically identifies separate VDD18CORE and VDD18PLL supplies and calls for the VDD18PLL bypass capacitor to be placed as close as possible to its power pin. The stated example uses an 0603 bypass capacitor, but engineers should follow the complete checklist for every supply and follow the datasheet rather than extrapolating one placement instruction to the entire package.
Keep the Ethernet PHY and magnetics portion of the layout as a compact, controlled-impedance implementation. Maintain the shortest practical path between the controller, isolation or network magnetics, and the board entry point, while avoiding digital switching nodes and high-current return paths beneath the differential pair. The verified material does not provide trace impedances or spacing values, so those must be taken from the manufacturer hardware guidance and the selected magnetics interface specification.
Do not treat every 128-pin power connection as interchangeable. The verified placement checklist separates at least VDD18CORE from VDD18PLL, and the LCSC listing indicates a 3.3 V supply condition. Before schematic capture, build a complete pin-by-pin power matrix from the manufacturer datasheet, including nominal voltage, tolerance, sequencing, decoupling, and whether each domain permits a different state during reset or power-down.
Avoid assuming that any Ethernet-controller comparison result is a drop-in substitute. The TSB43 comparison candidates found by the supplied searches lack verified 128-pin VTQFP pin assignments and electrical data. A valid replacement must match PCI pins, interrupts, clock requirements, power domains, PHY routing, and package geometry. Treat the LAN9420I-NU as the only confirmed source configuration until a candidate’s complete manufacturer datasheet has been checked line by line.
Thông tin tuân thủ
The supplied verification data does not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. These fields remain unknown rather than being inferred from the manufacturer name or package type.
