How to reduce electromagnetic noises in EPM3000/7000

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

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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.