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DS100BR410: DS50EV401SQE/NOPB

Rick Adolf
Intellectual 335 points
Part Number: DS100BR410
Other Parts Discussed in Thread: DS125BR820

Tool/software:

reposting this as it hasn't been resolved. I need to replace DS50EV401SQE/NOPB which is EOL. Is the DS100BR410SQE/NOPB a suitable replacement for a PCIe gen2 application? 

the cable being driven is a

https://cablesondemand.com/amphenol-cs-sasminihd2-004-4m-13-1-external-4x-hd-mini-sas-cable-4x-mini-sas-hd-sff-8644-to-4x-mini-sas-hd-sff-8644-passive-copper-cable-28-awg-12g-sas-3-0-ipass-hd-cs-sasminihd2-004

The redrivers (eight DS50EV401SQE/NOPB) sit between eight SAS connector ports  (an array of two 4x1 connectors) and a 32 lane PCIe Broadcom switch (PEX8749). A different redriver configuration may be acceptable.

Thanks!

  • 0
    TI__Mastermind 22125 points

    Hi Rick,

    For PCIe Gen2, I'd recommend taking a look at DS80PCIxxx and DS125BRxxx devices.

    Best,

    Lucas

  • 0
    Intellectual 335 points

    We've selected this device - DS125BR820NJYR. The power supply can either be 3.3V (and use the internal regulator) or 2.5V. Is there a preference? If I use 2.5V, can it be a DCDC and/or how clean/noise free does this supply need to be? 

    For configuration, we'd prefer not to use a SMBus/I2C and just hard wire the configuration pins once we've figured out what the configuration needs to be (by using switches or resistors with lots of loading options). Is there any issue with this approach?

    Thanks,
    Rick

  • 0 in reply to Rick Adolf
    TI__Mastermind 22125 points

    Hi Rick,

    I'm looking into this and will get back to you on Monday.

    Best,

    Lucas

  • 0 in reply to Lucas Wolter
    TI__Mastermind 22125 points

    Hi Rick,

    From TI side, there is no preference to use 3.3 V or 2.5 V supply mode. In 3.3 V mode, an internal LDO regulator is used to step the supply down to 2.5 V internally.

    A DC-to-DC converter can be used for the 2.5 V supply as long as it meets datasheet requirements. DC plus AC power should not exceed 2.375 V to 2.625 V range. I additionally recommend following the decoupling scheme shared in the Power Supply Recommendations section of the datasheet.

    The redriver will have less configuration options in pin mode than in SMBus mode. However I have seen many customers successfully use DS125BR820 in pin mode. I recommend still leaving an option for SMBus mode in your design including headers to access SDA/SCL/GND. SMBus mode will make device tuning and debug much easier, even if pin mode is used in the final operational design.

    Best,

    Lucas