MCHPKSZ8081RNACA

Overview

The KSZ8081RNACA is a single-supply 10Base-T/100Base-TX Ethernet physical layer transceiver designed for highly integrated networking applications. It utilizes the Reduced Media Independent Interface (RMII) to communicate with a MAC, significantly reducing pin count while providing a 50 MHz reference clock output. This compact 24-pin QFN solution includes on-chip termination resistors and baseline wander correction to simplify PCB layout and improve signal integrity.

Why Choose This Part

This transceiver reduces BOM costs by integrating termination resistors and supporting HP Auto MDI/MDI-X for automatic cable detection. It features a low power consumption profile of 34mA during full 100BASE-TX utilization and offers multiple power-down modes, including an energy-detect state that drops current to 3.77mA. The 4mm x 4mm QFN package is ideal for space-constrained designs where board real estate is at a premium.

Applications

Getting Started

To evaluate this PHY, use the KSZ8081RNA-EVAL board which provides standard RJ45 connectivity and header access to the RMII pins. Ensure your PCB layout maintains 100-ohm differential impedance for the transmit and receive pairs and place decoupling capacitors as close to the VDD pins as possible. Configuration is handled through the MDC/MDIO management interface using standard IEEE 802.3 registers.

KSZ8081 Family

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

Also Consider

Categories