Realtek PDF datasheets for RTL8208

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 pincount. Flexible hardware settings are provided to configure the various operating modes of the chip.

The RTL8208B(F)-LF provides 8 separate and independent channels. Each channel consists of an RMII/SMII/SS-SMII interface-to-MAC controller, and hardware pins are used to configure the interface for RMII, SMII, or SS-SMII mode. In RMII mode, another hardware pin is used to set Port-Pair Loopback mode (PP-LPBK MODE, RTL8208BF-LF only), which can extend physical transmission length and perform physical media transport operations without a switch controller.

A PECL (Pseudo Emitter Coupled Logic) receiver accepts input from a fiber transceiver and directly passed to a clock recovery circuit for data/clock recovery. The chip utilizes an advanced CMOS process to meet low voltage and low power requirements. With on-chip DSP (Digital Signal Processing) technology, the chip provides excellent performance under all operating conditions.

A built-in UTP cable tester diagnoses an open/short fault in an attached cable. The RTL8208B(F)-LF also features very low power consumption (maximum of 1.6W). Additionally, pin-outs are designed to provide optimized direct routing, which simplifies the layout work and reduces EMI noise issues.

The RTL8208 is a highly integrated 8 port, 10Base-T/100Base-TX/FX, Ethernet transceiver implemented in 0.25μm CMOS technology. It is currently the world’s smallest Octal-PHY chip package with many special patented features. Traditional SD pins in 100Base-FX are omitted by Realtek patent to obtain fewer pin-count. Flexible hardware settings are provided to configure the various operating modes of the chip.

The RTL8208 consists of 8 separate and independent channels. Each channel consists of an RMII/SMII/SS-SMII interface to MAC controller, and hardware pins are used to configure the interface for RMII, or SMII, or SS-SMII mode. In RMII mode, another hardware pin is used to set port-pair loop mode (PP-LPBK mode), which can extend physical transmission length or perform physical media transport operations without any switch controller.
In addition, the RTL8208 features very low power consumption, as low as 1.8 W (max.). Additionally, pin-outs are designed to provide optimized direct routing can be implemented, which simplifies the layout work and reduces EMI noise issues.