1FEATURES

2• Proven System Interoperability

• Comprehensive multi-protocol Repeater

Family

• Low 65-mW/Channel (Typ) Power

Consumption, With Option to Power Down

Unused Channels

• Transparent Management of Link Training

Protocol for PCIe and SAS

• Advanced Signal Conditioning Features

– Rx CTLE up to 30 dB (24 dB for SAS3)

– Tx De-Emphasis up to -12 dB

– Tx Output Voltage Control: 700 - 1300 mV

• Device Configuration Interface:

– Pin Selection, EEPROM, or SMBus Interface

• Single Supply Voltage: 2.5 V or 3.3 V

• −40°C to 85°C Operating Temperature Range

• 3-kV HBM ESD Rating

• Flow-Thru Pinout: 54-Pin LLP (10 mm x 5.5

mm, 0.5 mm pitch)

• Supported Protocols

– SAS/SATA

– PCIe

– Other Proprietary Interface up to 12.5 Gbps

DESCRIPTION

The DS125BR800A is an extremely low-power high-

performance multi-protocol repeater/redriver designed to support eight channels of PCIe, SAS, and other

high-speed interface serial protocols up to 12.5 Gbps.

The receiver's continuous time linear equalizer

(CTLE) provides a boost of up to +30 dB at 6.25 GHz

(12.5 Gbps) in each of its eight channels and is

capable of opening an input eye that is completely

closed due to inter symbol interference (ISI) induced by interconnect medium such as 30in+ backplane

traces or 8m+ copper cables, hence enabling host

controllers to ensure an error free end-to-end link.

The strong linear equalization maximizes interconnect channel extension when the DS125BR800A is placed

with the majority of channel loss on the devices input

side. Adjustable transmit de-emphasis and output

voltage amplitude help to compensate for the remaining channel attenuation on the output side.

When operating in SAS-3 and PCIe Gen-3 mode, the DS125BR800A 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. With a low power consumption of 65

mW/channel (typ) and option to turn-off unused

channels, the DS125BR800A enables energy efficient

system design. A single supply of 3.3 V or 2.5 V is required to power the device.

The programmable settings can be applied easily via

pins, software (SMBus or I2C) or loaded via an

external EEPROM. When operating in the EEPROM

mode, the configuration information is automatically

loaded on power up, which eliminates the need for an

external microprocessor or software driver.