The CD40106BE consists of six Schmitt-trigger circuits. Each circuit functions as an inverter with Schmitt-trigger action on the input. The trigger switches at different points for positive- and negative-going signals. The difference between the positive-going voltage (VP) and the negative-going voltage (VN) is defined as hysteresis voltage (VH).
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I use schmitt triggers to condition any signal destined to be an interrupt on a processor. This IC fills that need. The resulting effect between non-conditioned and conditioned signals is obvious, at least in my testing.
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Is there an Eagle definition for this part?
I don't think we use this part in our Eagle Library... if that is what you are asking. However, AutoDesk has a great tutorial on this subject: https://www.autodesk.com/products/eagle/blog/library-basics-part-1-creating-first-package-autodesk-eagle/
(*There are also other tutorials for creating components in Eagle that are available online, which you can find with a simple "Google" search.)