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AR# 10101

CPLD, CoolRunner-II, XPLA3 - Do CoolRunner devices have hysteresis on the inputs?

Description

General Description:

Do CoolRunner devices have hysteresis on the inputs?

Solution

CoolRunner XPLA3 devices have 50 mV of hysteresis on all inputs.

CoolRunner-II devices have a minimum of 500mV hysteresis that can be selected on each pin (via the Schmitt_trigger attribute). This can be done via the User Constraints File (UCF) or through the Assign Package Pins process in ISE.

UCF Example:

Net datain schmitt_trigger;

AR# 10101
Date Created 08/29/2007
Last Updated 12/15/2012
Status Active
Type General Article