General Description
The KSZ8051 is an AEC-Q100 standard qualified single-supply 10BASE-T/100BASE-TX Ethernet physical-layer transceiver.
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 KSZ8051MNL offers the Media Independent Interface (MII) and the KSZ8051RNL offers the Reduced Media Independent Interface (RMII) for direct connection with MII-/RMII-compliant Ethernet MAC processors and switches.

Features
• Single-Chip 10BASE-T/100BASE-TX IEEE 802.3 Compliant Ethernet Transceiver
• AEC-Q100 Qualified for Automotive Applications
• MII Interface Support (KSZ8051MNL)
• RMII v1.2 Interface Support with a 50 MHz Reference Clock Output to MAC, and an Option to Input a 50 MHz Reference Clock (KSZ8051RNL)
• Back-to-Back Mode Support for a 100 Mbps Copper Repeater
• MDC/MDIO Management Interface for PHY Register Configuration
• Programmable Interrupt Output
• LED Outputs for Link, Activity, and Speed Status Indication
• On-Chip Termination Resistors for the Differential Pairs
• Baseline Wander Correction
• HP Auto MDI/MDI-X to Reliably Detect and Correct Straight-Through and Crossover Cable Connections with Disable and Enable Option
• Auto-Negotiation to Automatically Select the Highest Link-Up Speed (10/100 Mbps) and Duplex (Half/Full)
• Power-Down and Power-Saving Modes
• LinkMD® TDR-Based Cable Diagnostics to Identify Faulty Copper Cabling
• Parametric NAND Tree Support for Fault Detection Between Chip I/Os and the Board
• Loopback Modes for Diagnostics
• Single 3.3V Power Supply with VDD I/O Options for 1.8V, 2.5V, or 3.3V
• Built-In 1.2V Regulator for Core
• Available in 32-pin 5 mm x 5 mm QFN Package

Target Applications
• Automotive In-Vehicle Networking