<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><br class=""><div><blockquote type="cite" class=""><div class="">On 18 Sep 2021, at 16:23, Tim Stinchcombe <<a href="mailto:tim102@timstinchcombe.co.uk" class="">tim102@timstinchcombe.co.uk</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class=""><blockquote type="cite" class="">The 4024 already has schmitt-trigger input. (Not on the reset line<br class=""></blockquote>though.)<br class=""><blockquote type="cite" class="">Datasheet says unlimited rise/fall time is allowed.<br class=""></blockquote><br class="">I'd be a little hesitant to suggest that this is so for _all_ makes of<br class="">CD4024 chips - on this Fairchild datasheet the maximum 'input rise and fall<br class="">times' given suggest there is a limit that one is recommended to not exceed:<br class=""><br class=""><a href="https://media.digikey.com/pdf/Data%20Sheets/Fairchild%20PDFs/CD4024BC.pdf" class="">https://media.digikey.com/pdf/Data%20Sheets/Fairchild%20PDFs/CD4024BC.pdf</a><br class=""></div></div></blockquote><div><br class=""></div>$DEITY! That is confusing even more. And different timing again.</div><div><br class=""></div><div>I was looking at TI and ON Semi:</div><div><br class=""></div><div><a href="https://www.ti.com/lit/ds/symlink/cd4024b.pdf?ts=1631976289114" class="">https://www.ti.com/lit/ds/symlink/cd4024b.pdf?ts=1631976289114</a></div><div><a href="https://www.onsemi.com/pdf/datasheet/mc14024b-d.pdf" class="">https://www.onsemi.com/pdf/datasheet/mc14024b-d.pdf</a></div><div><br class=""></div><div>which both have the Schmitt-trigger input. Fairchild doesn’t even mention it.</div><div><br class=""></div><div>Ben</div><div><br class=""></div></body></html>