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TMS570LS3137-EP: Questions on flash retention

Brad Caldwell
Genius 12595 points
Part Number: TMS570LS3137-EP
Other Parts Discussed in Thread: TMS570LS3137

Dear Hercules Champs

The TMS570LS3137-EP datasheet, table 6-24, noted 5 years of data retention at 125C (is this Tj or TA air?). and has note 3.  So apparently this is after storing it at 250C for 168 hours and then calculating it if Tj was at 125C though its use life.

Do you know what it might be for a Tj of +55C (or other lower temperatures) and without this extensive temperature storage?  15 years min?

Also, can you confirm that data retention would be longer if stored at cold (-55C) or basically that it is better at cold and worse the hotter the application.

Thanks

  • 0
    TI__Guru**** 191886 points

    Hi Brad,

      The datasheet presents the worst case data. I have no reason to doubt the data retention rate will be much extended if not operating at the worst limit. As a matter of fact, in the TMS570LS3137 datasheet, (this is the part number without the -EP), the data is presented in terms of number of write/erase cycles for 15 years of data retention rate. Therefore, 15 years would be met if the retention modeling is not based off the 250C/168hours. The -EP variant is targeted for high reliability and therefore the data is presented for the extreme operating usage. I will ask my colleague again but I'm pretty sure we will not have the data specifically for 55C operating temperature. I hope the the TMS570LS3137 datasheet should provide enough assurance to you. 

  • 0 in reply to Charles Tsai
    TI__Guru**** 191886 points

    I hope you will also find this document helpful.

    I was told by our flash expert our spec for Hercules was an equivalent to 100,000 hours at 105C junction. That is equivalent to 1225 years at 55C junction. You can play with the calculator contained the app note.