KSZ8021RNL

KSZ8021RNL / KSZ8031RNL 10Base-T/100Base-TX PHY with RMII Support General Description Features The KSZ8031RNL is a single-supply 10Base-T/100BaseTX Ethernet physical layer transceiver for transmission and reception of data over standard CAT-5 unshielded twisted pair (UTP) cable. The KSZ8031RNL is a highly-integrated, compact solution. It reduces board cost and simplifies board layout by using on-chip termination resistors for the differential pairs, 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 KSZ8031RNL 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 KSZ8031RNL uses a 25MHz crystal to generate all required clocks, including the 50MHz RMII reference clock output for the MAC. The KSZ8021RNL is the version that takes in the 50MHz 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 KSZ8031RNL I/Os and board, while Micrel’s LinkMD® TDR-based cable diagnostics permit identification of faulty copper cabling. The KSZ8031RNL and KSZ8021RNL are available in 24pin, lead-free QFN packages (see Ordering Information). Data sheets and support documentation can be found on Micrel’s web site at: www.micrel.com. Single-chip 10Base-T/100Base-TX IEE...