New ContributorI am looking for the center voltage value for a pin on the Max V CPLD, when it is configured as a 3.3V Schmitt trigger input. The datasheet shows a hysteresis voltage of 400 mV for Vccio = 3.3V, but it does not specify that actual trip points, or at least the center point.
Thank you for the input, Frank.
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Super ContributorHi,
unfortunately MAX V datasheet (neither other CPLD or FPFA datasheets) give typical threshold voltage for 3.3V IO-standard, you can assume that it's somewhere between Vil,max of 0.8 V and Vih,min of 1.7 V. 3.3V ST thresholds have in case of doubt +/- offset to lvcmos33.
To evaluate typical ST thresholds, you'll need to make your own measurements. You can e.g. setup a slow RC ST oscillator and measure reversal points.
New ContributorThanks for the info. We decided to perform the measurements ourselves, as you recommended.
Regular ContributorThank you for the input, Frank.
Do you have any more help needed on this issue?
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