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AM3352: High-speed bypass capacitors for DDR3

paddu2017
Expert 2885 points
Part Number: AM3352

Hi,

I am sorry for asking this basic question.
With regards to the "High-Speed Bypass Capacitors", the datasheet mentions that
"It is particularly important to minimize the parasitic series inductance of the HS bypass capacitors".

Could you please let me know how would "parasitic series inductance" effect DDR3 perfomance,
what exactly it will effect.

Best Regards
paddu

  • 0
    TI__Guru**** 393215 points
    Hi,

    The whole sentence is:

    "It is particularly important to minimize the parasitic series inductance of the HS bypass capacitors, AM335x device DDR3 power, and AM335x device DDR3 ground connections."

    This basically means that HS bypass capacitors should be placed as close as possible to the DDR3 (resp. processor) power supply balls they decouple. If this is not done the decoupling effect may deteriorate significantly, esp. on higher frequencies. Table 7-63 in the AM335x Datasheet Rev. J gives maximum recommended distances.