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RTL8251C(L)
Integrated 10/100/1000 Gigabit Ethernet Transceiver
 
General Description

The Realtek RTL8251C(L) is a highly integrated Ethernet transceiver that complies 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 or CAT 3 UTP (10Mbps only) cable.

The RTL8251C(L) 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 RTL8251C(L) 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.

 
Features
  • 1000Base-T IEEE 802.3ab Compliant
  • 100Base-TX IEEE 802.3u Compliant
  • 10Base-T IEEE 802.3 Compliant
  • IEEE 802.3 Compliant RGMII
  • Supports Auto-Negotiation
  • Supports Parallel Detection
  • Crossover Detection & Auto-Correction
  • Automatic polarity correction
  • Transmit wave-shaping
  • DSP processing
  • Internal hybrids for 1000Base-T
  • Baseline Wander Correction
  • Supports half/full duplex operation
  • Transmission rate up to 1Gbps over industry standard CAT.5 UTP cable with BER less than 10-10 in 1000Base-T
  • The design transceiver capability target is up to 120m for CAT.5 cable in 1000Base-T
  • Supports 3.3V or 2.5V signaling for RGMII
  • Supports 25MHz external crystal or OSC
  • Provides 125MHz clock source for MAC
  • Supports Interrupt function
  • Network Status LEDs
    • The RTL8251C provides 5 network status LEDs
    • The RTL8251CL provides 2 network status LEDs
  • Supports Link Down power saving
  • Built-in Switching regulator
  • 64-pin QFN (RTL8251C)
  • 48-pin LQFP (RTL8251CL)
  • 0.11µm process with very low power consumption
Applications
  • Network Interface Adapter, MAU (Media Access Unit)
  • CNR (Communication and Network Riser)
  • ACR (Advanced Communication Riser)
  • Ethernet hub
  • Ethernet switch
In addition, the RTL8251C(L) can be used in any embedded system with an Ethernet MAC that needs a UTP physical connection.

     

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