KSZ8081RNACA-TR

The KSZ8081RNA/RND is a single-supply 10BASE-T/100BASE-TX Ethernet physical-layer transceiver for transmission and reception of data over standard CAT-5 unshielded twisted pair (UTP) cable. The KSZ8081RNA/RND 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, and by offering 1.8/2.5/3.3V digital I/O interface support. The KSZ8081RNA/RND offers the Reduced Media Independent Interface (RMII) for direct connection to RMII-compliant MACs in Ethernet processors and switches. As the power-up default, the KSZ8081RNA/RND uses a 25 MHz crystal to generate all required clocks, including the 50 MHz RMII reference clock output for the MAC. The KSZ8081RND is the version that takes in the 50 MHz RMII reference clock as the power-up default. To facilitate system bring-up and debugging in production testing and in product deployment, parametric NAND tree support enables fault detection between KSZ8081RNA/RND I/Os and the board. LinkMD TDR-based cable diagnostics identify faulty copper cabling. The KSZ8081RNA and KSZ8081RND are available in 24-pin, lead-free QFN packages.

Applications

• Game Consoles
• IP Phones
• IP Set-Top Boxes
• IP TVs
• LOM
• Printers

Key features

• Single-Chip 10BASE-T/100BASE-TX IEEE 802.3 Compliant Ethernet Transceiver
• RMII v1.2 Interface Support with a 50 MHz Reference Clock Output to MAC, and an Option to Input a 50 MHz Reference Clock
• RMII 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 and Activity 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
• HBM ESD Rating (6 kV)
• 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 24-pin 4 mm x 4 mm QFN Package