1 Features

1• 12.5-Gbps Dual Lane 2:1 Mux, 1:2 Switch or

Fanout

• Low 390-mW Total Power (Typical)

• Advanced Signal Conditioning Features:

– Receive Equalization up to 30 dB at 6.25 GHz

– Transmit De-Emphasis up to –12 dB

– Transmit Output-Voltage Control: 600 mV to

1300 mV

• Programmable Through Pin Selection, EEPROM

or SMBus Interface

• Selectable 2.5-V or 3.3-V Supply Voltage

• –40°C to +85°C Operating Temperature Range

2 Applications

• 10GE, 10G-KR

• PCIe Gen-1/2/3

• SAS2/SATA3 (Up to 6 Gbps)

• XAUI, RXAUI

3 Description

The DS125MB203 device is a dual port 2:1

multiplexer and 1:2 switch or fan-out buffer with

signal conditioning suitable for 10GE, 10G-KR

(802.3ap), Fibre Channel, PCIe, Infiniband,

SATA3/SAS2 and other high-speed bus applications

with data rates up to 12.5 Gbps. The continuous time

linear equalizer (CTLE) of the receiver provides

necessary boost to compensate up to 30-inch FR-4

or 8-m cable (AWG-24) at 12.5 Gbps. This on-chip

feature eliminates the need for external signal

conditioners. The transmitter features a

programmable amplitude voltage levels to be

selectable from 600 mVp-p to 1300 mVp-p and deemphasis

of up to 12 dB.

The DS125MB203 can be configured to support

PCIe, SAS/SATA, 10G-KR or other signaling

protocols. When operating in 10G-KR and PCIe Gen-

3 mode, the DS125MB203 transparently allows the

host controller and the end point to optimize the full

link and negotiate transmit equalizer coefficients. This

seamless management of the link training protocol

ensures system level interoperability with minimum

latency.