Catalog
10/100Base-T/TX Physical Layer Transceiver
Key Features
• **•** Single-chip 10Base-T/100Base-TX IEEE 802.3 compliant Ethernet transceiver
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• **•** AEC-Q100 qualified for automotive applications
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• **•** MII interface support (KSZ8051MNLU/V)
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• **•** RMII v1.2 Interface support with a 50MHz reference clock output to MAC, and an option to input a 50MHz reference clock (KSZ8051RNLUB-VAO)
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• **•** Back-to-back mode support for a 100Mbps copper repeater
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• **•** MDC/MDIO management interface for PHY register configuration
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• **•** Programmable interrupt output
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• **•** LED outputs for link, activity, and speed status indication
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• **•** On-chip termination resistors for the differential pairs
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• **•** Baseline wander correction
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• **•** HP Auto MDI/MDI-X to reliably detect and correct straight-through and crossover cable connections with disable and enable option
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• **•** Auto-negotiation to automatically select the highest link-up speed (10/100Mbps) and duplex (half/full)
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• **•** Power-down and power-saving modes
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• **•** LinkMD TDR-based cable diagnostics to identify faulty copper cabling
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• **•** Parametric NAND Tree support for fault detection between chip I/Os and the board
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• **•** Loopback modes for diagnostics
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• **•** Single 3.3V power supply with VDD I/O options for 1.8V, 2.5V, or 3.3V
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• **•** Built-in 1.2V regulator for core
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• **•** 32-pin (5mm x 5mm) QFN package
Description
AI
The KSZ8051 is an AEC-Q100 standard qualified single-supply 10Base-T/100Base-TX Ethernet physical-layer transceiver for automotive applications.
The KSZ8051 is a highly-integrated PHY solution. It reduces board cost and simplifies board layout by using on-chip termination resistors for the differential pairs and by integrating a low-noise regulator to supply the 1.2V core. The KSZ8051MNLU/V offers the Media Independent Interface (MII) and the KSZ8051RNLUB-VAO offers the Reduced Media Independent Interface (RMII) for direct connection with MII/RMII-compliant Ethernet MAC processors and switches. A 25MHz crystal is used to generate all required clocks, including the 50MHz RMII reference clock output for the KSZ8051RNLUB-VAO.
The KSZ8051 provides diagnostic features to facilitate system bring-up and debugging in production testing and in product deployment. Parametric NAND tree support enables fault detection between KSZ8051 I/Os and the board. LinkMD TDR-based cable diagnostics identify faulty copper cabling. The KSZ8051MNLU/V and KSZ8051RNLUB-VAO are available in 32-pin, 5x5 lead-free QFN packages
Microchip's complimentary and confidential [MicroCHECK](https://www.microchip.com/en-us/support/design-help/design-check-services) design review service, which offers insight from the initial concept to the final PCB layout, is available to customers who are using our products in their projects. You can confidently submit your design materials in a secure and private setting, and our expert engineers will provide individualized feedback to enhance your design. MicroCHECK design review service is subject to Microchip's [Program Terms and Conditions](https://www.microchip.com/en-us/support/design-help/design-check-services/design-check-services-program-terms-and-conditions) and requires a myMicrochip account.
