Broadcom BCM5221 Single-Port RMII 10/100BASE-TX Transceiver

Broadcom BCM5221 Single-Port RMII 10/100BASE-TX Transceivers feature an integrated voltage regulator and can be supplied by a 2.5V or 3.3V power source. The BCM5221 series offers low-power Fast Ethernet PHY and incorporates several intelligent power management features, including three low-power modes with varying levels of power dissipation. These devices are capable of powering down when not connected to the network, making them ideal for power-sensitive applications, including portable computer LOMs and PCMCIA/CardBus cards. Broadcom BCM5221 Single-Port RMII 10/100BASE-TX Transceivers can also be set to periodically power up at user-defined intervals, allowing the system to initiate "keep-alive" traffic on the network. For the lowest power consumption, the modules can be put in apower-off state (<2.5mW).


  • 2.5V or 3.3V power supply
  • Integrated voltage regulator to allow operation from a single supply source
  • <175mW power consumption
  • Unique energy detection circuit to enable intelligent power management
  • HP Auto-MDIX
  • Cable length indication
  • Cable noise level indication
  • Robust CESD tolerance
  • <145m cable length
  • ±10% voltage tolerance
  • Well under 10PPM defect ratio quality
  • Industrial temperature range (-40°C to +85°C) option available
  • MII and RMII configurable
  • IEEE 1149.1 (JTAG) scan chain support
  • MII management via serial port
  • Layout compatible with BCM5201
  • 10BASE-T/100BASE-TX/FX IEEE 802.3u fast Ethernet transceiver
  • Glueless TX-to-FX media conversion


  • Blade servers
  • Network interface cards (NICs)
  • Routers
  • Gaming devices
  • Servers
  • Switches

Block Diagram

Block Diagram - Broadcom BCM5221 Single-Port RMII 10/100BASE-TX Transceiver
Publicado: 2019-09-17 | Atualizado: 2023-07-03