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1 Features

1? Low 65-mW/Channel (Typ) Power Consumption,

With Option to Power Down Unused Channels

? Linear Equalization allows for Link Training in

PCIe and SAS

? Supports Out-of-Band (OOB) Signaling

? Advanced Signal Conditioning B-Side I/O

– Receive CTLE up to 24 dB at 6 GHz

– Transmit (Tx) DE > 10 dB

– Tx Output Voltage: 700 mV to 1400 mV

? Advanced Signal Conditioning A-Side I/O

– Receive CTLE up to 10 dB at 6 GHz

– Linear output drive

– Output voltage range over 1200mV

Programmable via Terminal Selection, EEPROM,

or SMBus Interface

? Single Supply Voltage: 2.5 V or 3.3 V

? ?40°C to 85°C Operating Temperature Range

? 4 kV HBM ESD Rating

? Flow-Thru Layout in 10mmx5.5mm 54-Terminal

Leadless WQFN Package

2 Applications

? SAS/SATA

? PCI Express

? Other Proprietary Interfaces up to 12 Gbps

3 Description

The DS125BR401A is an extremely low-power high-

performance repeater/redriver designed to support

four lanes carrying high speed interface up to 12

Gbps. The B-Side receiver's continuous time linear

equalizers (CTLE) provide high frequency boost of up

to +24 dB at 6 GHz (12 Gbps) and are capable of

opening an input eye that is completely closed due to

inter symbol interference (ISI) induced by

interconnect medium such as backplane traces or

twinaxial copper cables. The programmable

equalization allows maximum flexibility in the physical

placement within the interconnect channel. The A- Side channel has a 10 dB linear equalizer and linear

output driver.

The A-Side channel has a settable 3-10 dB linear

equalizer coupled to a linear output driver. When

operating in SAS-3 and PCIe Gen-3 applications the

DS125BR401A preserves transmit signal

characteristics allowing the host controller and the end point to negotiate transmit equalizer coefficients.

This transparency to the link training protocol aides

system level interoperability and minimum latency.

The programmable settings can be applied easily via

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

external EEPROM. In EEPROM mode, the

configuration information is automatically loaded on

power up, which eliminates the need for an external microprocessor or software driver.