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RTL8208BF

SINGLE-CHIP OCTAL 10/100BASE-TX/FX PHY TRANSCEIVER

Realtek Semiconductor 

RTL8208B-LF/RTL8208BF-LF

Datasheet

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.

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.

Single-Chip Octal 10/100-TX/FX PHY Transceiver

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Track ID: JATR-1076-21 Rev. 1.3

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