KSZ8021RNL / KSZ8031RNL 10Base-T/100Base-TX PHY with RMII Support General Description Features The KSZ8031RNL is a single-supply 10Base-T/100Base- Single-chip 10Base-T/100Base-TX IEEE 802.3 TX Ethernet physical layer transceiver for transmission compliant Ethernet Transceiver and reception of data over standard CAT-5 unshielded RMII v1.2 Interface support with 50MHz reference clock twisted pair (UTP) cable. output to MAC, and option to input 50MHz reference The KSZ8031RNL is a highly-integrated, compact solution. clock It reduces board cost and simplifies board layout by using RMII back-to-back mode support for 100Mbps copper on-chip termination resistors for the differential pairs, by repeater or media converter integrating a low noise regulator to supply the 1.2V core, MDC/MDIO Management Interface for PHY register and by offering 1.8/2.5/3.3V digital I/O interface support. configuration The KSZ8031RNL offers the Reduced Media Independent Programmable interrupt output Interface (RMII) for direct connection to RMII-compliant LED outputs for link and activity status indication MACs in Ethernet processors and switches. On-chip termination resistors for the differential pairs As the power-up default, the KSZ8031RNL uses a 25MHz Baseline Wander Correction crystal to generate all required clocks, including the 50MHz RMII reference clock output for the MAC. The HP Auto MDI/MDI-X for reliable detection and KSZ8021RNL is the version that takes in the 50MHz RMII correction for straight-through and crossover cables reference clock as the power-up default. with disable and enable option To facilitate system bring-up and debugging in production Auto-negotiation to automatically select the highest link- testing and in product deployment, parametric NAND tree up speed (10/100 Mbps) and duplex (half/full) support enables fault detection between KSZ8031RNL Power down and power saving modes I/Os and board, while Micrels LinkMD TDR-based cable LinkMD TDR-based cable diagnostics for identification diagnostics permit identification of faulty copper cabling. of faulty copper cabling The KSZ8031RNL and KSZ8021RNL are available in 24- Parametric NAND Tree support for fault detection pin, lead-free QFN packages (see Ordering Information). between chip I/Os and board Data sheets and support documentation can be found on Micrels web site at: www.micrel.com. Functional Diagram LinkMD is a registered trademark of Micrel, Inc. Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. KSZ8021RNL / KSZ8031RNL More Features Applications Loopback modes for diagnostics Game Console Single 3.3V power supply with VDD I/O options for IP Phone 1.8V, 2.5V, or 3.3V IP Set-top Box Built-in 1.2V regulator for core IP TV Available in 24-pin (4mm x 4mm) QFN package LOM Printer Ordering Information Temperature Part Number Package Lead Finish Description Range RMII with 50MHz clock input (power-up default), KSZ8021RNL 0C to 70C 24-Pin QFN Pb-Free Commercial Temperature RMII with 50MHz clock input (power-up default), (1) KSZ8021RNLI 40C to 85C 24-Pin QFN Pb-Free Industrial Temperature RMII with 25MHz crystal/clock input and 50MHz RMII KSZ8031RNL 0C to 70C 24-Pin QFN Pb-Free REF CLK output (power-up default), Commercial Temperature RMII with 25MHz crystal/clock input and 50MHz RMII (1) KSZ8031RNLI 40C to 85C 24-Pin QFN Pb-Free REF CLK output (power-up default), Industrial Temperature Note: 1. Contact factory for lead time. August 2010 2 M9999-082710-1.0