The HI-5201 is a single supply 10Base-T/100Base-TX physical layer transceiver, which provides an RMII interface to transmit and receive data. It does not require a 50MHz system clock and uses a 25MHz crystal/clock input to generate a 50MHz RMII reference clock output to the MAC.


HP Auto MDI/MDI-X provides the most robust solution for eliminating the need to differentiate between crossover and straight-through cables. An optional interrupt pin provides status updates to the external controller, avoiding the need for continuous polling.


The device is capable of enhanced (−40oC to +105oC) and extended(−55oC to +125oC) operating temperature ranges, with optional burn-in available in the extended temperature version. 




  • Single-chip 10Base-T/100Base-TX physical layer solution with auto-negotiation
  • Pin selectable 10Base-T or 100Base-Tx at power-up/reset with auto-negotiation disable option
  • Fully compliant to IEEE 802.3u standard
  • Low power CMOS design, power consumption of <180mW
  • HP auto MDI/MDI-X for reliable detection and correction for straight-through and crossover cables with disable and enable option
  • Robust operation over standard cables
  • Power down and power saving modes
  • RMII interface support with 25MHz crystal/clock input and 50MHz reference clock output to MAC
  • MIIM (MDC/MDIO) management bus to 6.25MHz for rapid PHY register configuration
  • Interrupt pin option
  • Programmable LED outputs for link, activity and speed
  • ESD rating (6kV)
  • Single power supply (3.3V)
  • Built-in 1.8V regulator for core
  • Enhanced (−40oC to +105oC) and extended (−55oC to +125oC) operating temperature ranges
  • Full range of supporting magnetics available in both industrial and extended operating temperature ranges
  • Available in a 32-pin QFN (5mm x 5mm) or QFP packages