DS125BR800A_14 Datasheet, PDF (1/54 Pages) Texas Instruments – Low-Power 12.5-Gbps 8-Channel (Unidirectional) Repeater With Input Equalization

DS125BR800A
www.ti.com
SNLS467 – NOVEMBER 2013
Low-Power 12.5-Gbps 8-Channel (Unidirectional) Repeater With Input Equalization
Check for Samples: DS125BR800A
FEATURES
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•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.
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2013 , Texas Instruments Incorporated