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ID: 5835
Case Type: faq
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Family: ispMACH 4000

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Why ispMACH datasheet didn't provide rise and fall time?

Lattice FPGA inputs are very fast, thus are very sensitive to noise, there is no Schmitt trigger or hysteresis option. A perfect monotonically rising edge could an arbitrarily slow rise time, but the reality is noisy. A good rule of thumb for the minimum rise time is 50mV/ns.
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