KSZ8021RNL Datasheet | Micrel Semiconductor

KSZ8021RNL / KSZ8031RNL 10Base-T/100Base-TX PHY with RMII Support General Description Features The KSZ8031RNL 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 KSZ8031RNL is a highly-integrated, pact 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-pliant 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 Link MD® 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: .micrel.. - Single-chip 10Base-T/100Base-TX IEEE 802.3 pliant Ethernet Transceiver - RMII v1.2 Interface support with 50MHz reference clock output to MAC, and option to input 50MHz reference clock - RMII back-to-back mode support for 100Mbps copper repeater or media converter - 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 for...