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SM28VLT32-HT: Endurance definition (write/erase cycles)

_MM_
Expert 1995 points
Part Number: SM28VLT32-HT

Hello,

I would need some help to understand the meaning of the endurance value of the SM28VLT32. The datasheet reports 1000 cycles.

Is one single cycle considered completed when the memory gets full and then ready to be "overwritten" or it is just any time I write (appending) on it before the end is reached ?

Thanks ahead.

Regards,

Marco

  • 0
    Guru 317190 points
    The limit applies to each bit separately. (In practice, to each sector, because of the erase size.)
  • 0 in reply to Clemens Ladisch
    TI__Guru 62930 points
    Marco,
    I concur with Clemen's response.
    Regards,
    Wade
  • 0 in reply to Wade Vonbergen
    Expert 1995 points

    Thanks to both. 1000 cycles look quite a few. I just wonder the reason why a so low value compared with other memories existing in the market.

  • 0 in reply to _MM_
    Guru 317190 points
    The construction of flash cells is a compromise between making it hard for a cell to change (so that the value is retained for a long time) and making it easy for a cell to change (so that it can be reprogrammed).

    At higher temperatures, flash changes more easily.

    "Normal" flash is designed so that it can be erased/reprogrammed even at low temperatues (e.g., −40 °C), and so that it retains its contents for a reasonable time even at high temperatues (e.g., 85 °C or 105 °C).

    The SM28VLT32-HT is designed for much higher temperatures. This means that the cells are harder to change, and that the erase/programming voltage must be higher and/or applied longer, which increases the stress on the flash cells.