General Description

The Realtek RTL8211FD-CG/RTL8211FDI-CG is a highly integrated Ethernet transceiver that is compatible with 10Base-T, 100Base-TX, and 1000Base-T IEEE 802.3 standards. It provides all the necessary physical layer functions to transmit and receive Ethernet packets over CAT.5 UTP cable. The RTL8211FDI-CG is manufactured to industrial grade standards.

The RTL8211FD(I)-CG uses state-of-the-art DSP technology and an Analog Front End (AFE) to enable high-speed data transmission and reception over UTP cable. Functions such as Crossover Detection & Auto-Correction, polarity correction, adaptive equalization, cross-talk cancellation, echo cancellation, timing recovery, and error correction are implemented in the RTL8211FD(I)-CG to provide robust transmission and reception capabilities at 10Mbps, 100Mbps, or 1000Mbps.

Data transfer between MAC and PHY is via the Reduced Gigabit Media Independent Interface (RGMII) for 1000Base-T, 10Base-T, and 100Base-TX. The RTL8211FD(I)-CG supports various RGMII signaling voltages, including 3.3, 2.5, 1.8, and 1.5V.

The RTL8211FD(I)-CG incorporates a linear Low-Dropout Regulator (LDO) that features high power supply ripple rejection and low output noise. The built-in LDO means a power inductor is not required for the RTL8211FD(I)-CG; only an output capacitor is required between the 1.0V output and the analog ground for phase compensation, which saves cost and PCB real estate.


  • 1000Base-T IEEE 802.3ab compatible
  • 100Base-TX IEEE 802.3u compatible
  • 10Base-T IEEE 802.3 compatible
  • Supports RGMII
  • Supports IEEE 802.3az-2010 (Energy Efficient Ethernet)
  • Built-in Wake-on-LAN (WOL)
  • Supports Interrupt function
  • Supports Parallel Detection
  • Crossover Detection & Auto-Correction
  • Automatic polarity correction
  • Supports PHYRSTB core power Turn-Off
  • Baseline Wander Correction
  • Supports 120m for CAT.5 cable in 1000Base-T
  • Selectable 3.3/2.5/1.8/1.5V signaling for RGMII
  • Supports 25MHz external crystal or OSC
  • Provides 125MHz clock source for MAC
  • Provides 3 network status LEDs
  • Supports Link Down power saving
  • Green Ethernet (1000/100Mbps mode only)
  • Built-in Switching LDO
  • 40-pin QFN Green package
  • 55 nm process with ultra-low power consumption
  • Industrial grade manufacturing process (RTL8211FDI-CG)


  • DTV (Digital TV)
  • MAU (Media Access Unit)
  • CNR (Communication and Network Riser)
  • Game Console
  • Printer and Office Machine
  • DVD Player and Recorder
  • Ethernet Hub
  • Ethernet Switch

In addition, the RTL8211FD(I)-CG can be used in any embedded system with an Ethernet MAC that needs a UTP physical connection.