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