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F2808 Waitstates @ narrow temp range

M.A.M
Expert 8945 points


Hi,
Can you please advise us on flash waitstates? I received this question from a customer:
" - I am running the F2808 core @ 57.6MHz max and I am wondering if a 1-1-3 (Paged/Random/OTP) setting would be fine in the temperature range from -5 to +70degC?I
I also wonder what setting should be used for -25 to +70?
Per formula in the DS SPRS230N, I see table 6-47 page 132, the limit goes at 55.6MHz, I am therefore 3.6% over the limit, but my temp-range is not -40 to +85."

Thanks!   /Magnus Aman

  • 0
    TI__Guru* 81560 points
    Magnus,
    The customer needs to follow the DS formula/table, and increase the Paged/Random to 2-2. The numbers published in the DS are what TI guarantees the device will work within over all temp/voltage conditions as well as lifetime of the device. We cannot give a relaxed number even though customer's temp profile is not to the limit.

    Given the performance delta this would cause, it may be more beneficial for customer to reduce the input clock so that 55.6MHz would be the max so that the WS can be brought back to 1-1.

    Best,
    Matthew