MICROCHIP KSZ8091RNDCA-TR

KSZ8091RNA is a single-supply 10BASE-T/100BASE-TX Ethernet PHY transceiver for transmitting and receiving data over standard CAT-5 unshielded twisted-pair cable. This device is a highly integrated PHY solution that reduces board cost and simplifies board layout by utilizing on-chip termination resistors for differential pairs, an integrated low-noise LDO regulator providing 1.2V core voltage, and a flexible 1.8/2.5/3.3V digital I/O interface. It provides a Reduced Media Independent Interface for direct connection to RMII-compliant Ethernet MAC processors and switches. As the power-on default, KSZ8091RNA uses a 25 MHz crystal to generate all required clocks, including a 50 MHz RMII reference clock output for the MAC. KSZ8091RND accepts a 50 MHz RMII reference clock input as the power-on default. Energy Efficient Ethernet provides additional power savings during idle traffic, while Wake-on-LAN offers KSZ8091RNA a mechanism to wake systems in standby power mode. KSZ8091RNA and KSZ8091RND are available in a 24-pin, lead-free QFN package.

• Single-chip 10BASE-T/100BASE-TX IEEE 802.3 compliant Ethernet transceiver
• RMII V1.2 interface support with 50 MHz reference clock output to MAC and optional 50 MHz reference clock input
• RMII back-to-back mode for 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 differential pairs
• Baseline wander correction
• Auto MDI/MDI-X with reliable detection and correction of straight-through and crossover cable connections, with enable/disable option
• Auto-negotiation for automatic link speed (10/100 Mbps) and duplex mode (half/full duplex) selection
• Energy Efficient Ethernet support with low-power idle mode for 100BASE-TX and reduced transmit amplitude for 10BASE-TE option
• Wake-on-LAN support via magic packet, link status change, or robust custom packet detection
• LinkMD TDR-based cable diagnostics for identifying faulty copper cable wiring
• HBM ESD rating (6 kV)
• Parametric NAND tree support for fault detection between chip I/O and board
• Loopback mode for diagnostics
• Power-down and power-saving modes
• Single 3.3V supply with VDD I/O option supporting 1.8V, 2.5V, or 3.3V
• Integrated 1.2V regulator for core
• 24-pin (4 mm × 4 mm) QFN package

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