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Altera_Forum's avatar
Altera_Forum
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14 years ago

How to reduce electromagnetic noises in EPM3000/7000

Hi everybody,

Good evening.

Is anyone know how to reduce the electromagnetic noises in EPM3000/7000. We faced with situation that newer CPLD families much noisy than the old ones.

Please advice.

Thank you

2 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    14 years ago

    The reason for that is most likely that the rise and fall times is much lower in newer families.

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    14 years ago

    --- Quote Start ---

    The reason for that is most likely that the rise and fall times is much lower in newer families.

    --- Quote End ---

    Yes, that can be expected. But doesn't solve the problem. MAX3000 and 7000 don't have programmable IO strength, so the slow-slew-rate option is the only available means besides hardware modifications to handle the issue. Output series resistors, better supply bypassing, ferrite filters are possible means.