1. General Description
The RTL8208B-LF and RTL8208BF-LF (jointly referred to as the RTL8208B(F)-LF) are single-chip highly integrated 8-port, 10Base-T/100Base-TX (FX) Ethernet transceivers implemented in 0.18µm CMOS technology. They are currently the world’s smallest Octal-PHY chip package. Realtek patented removal of traditional SD pins in 100Base-FX (RTL8208BF-LF only) allow us to obtain a lower pin count. Flexible hardware settings are provided to configure the various operating modes of the chip.

2. Features
  Supports 8-port integrated physical layer and transceiver for 10Base-T and 100Base-TX
  Up to 8 ports support 100Base-FX (RTL8208BF-LF only)
  Reduced 100Base-FX (RTL8208BF-LF only) interface (patented)
  Robust baseline wander correction for improved 100Base-TX performance
  Complies with IEEE 802.3/802.3u
  IEEE 802.3u compliant auto negotiation for 10/100Mbps control
  Hardware controlled Flow control advertisement ability
  Supports RMII/SMII/SS-SMII interfaces
  Very low power consumption
  Supports Port-Pair Loopback mode (PPLPBK mode, RTL8208BF-LF only)
  Supports two power reduction methods:
  Power saving mode (cable detection)
  Power down mode
  Power-on auto reset function eliminates the need for external reset circuits
  Crossover detection and auto correction
  Polarity detection and Auto Correction
  Flexible serial/scan LED display modes
  Cable tester for diagnosing open/short faults in attached cables
  128-pin QFP package
  1.8V/3.3V power supply
  0.18µm, CMOS technology

3. Applications
  RTL8208B-LF
    Octal PHY for Fast Ethernet switch with twisted pair interface
  RTL8208BF-LF
    Octal PHY for Fast Ethernet switch with twisted pair interface and fiber capability