KSZ8081RNBCA-TR

Overview

The KSZ8081RNBCA-TR is a single-supply 10Base-T/100Base-TX Ethernet physical layer transceiver designed for compact embedded systems. It utilizes the Reduced Media Independent Interface (RMII) to minimize pin count between the MCU/Processor and the PHY, featuring integrated termination resistors and a small 5x5mm QFN package.

Why Choose This Part

This PHY reduces BOM cost and PCB complexity by integrating on-chip termination resistors for differential pairs and offering HP Auto MDI/MDI-X for automatic cable correction. Its low power consumption of 34mA during full-duplex 100BASE-TX operation, combined with multiple power-down modes, makes it suitable for energy-sensitive designs.

Applications

Getting Started

To evaluate this PHY, use the KSZ8081RNB-EVAL board which provides standard RJ45 connectivity and access to the RMII pins. Ensure your MAC provides a stable 50 MHz reference clock, or configure the PHY to output the clock via its internal oscillator, and interface through the MDC/MDIO management pins for register configuration.

KSZ8081 Family

Comparing specs that differ across variants. The current part is highlighted.