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/iframe></center><br><br> <br><br> </center> </td></tr> </table> <center> <table> <tr> <td width="600"> <center><hr width="400"><font size="2"><b>The <a href="http://www.cyber-spy.com/">Cyber-Spy.Com</a> Usenet Archive Feeds Directly<br>From The Open And Publicly Available Newsgroup<br>Sci.Electronics.Design<br><br>This Group And Thousands Of Others Are Available<br>On Most IS NNTP News Servers On Port 119.<br><br><a href="http://www.cyber-spy.com/">Cyber-Spy.Com</a> Is NOT Responsible For Any Topic,<br>Opinions Or Content Posted To This Or Any Other<br>Newsgroup. This Web Archive Of The Newsgroup And<br>Posts Are For Informational Purposes Only.<br><br></b></font><hr width="400"></center> <center><font size="2"><pre><b> From: Winfield Hill <whill@picovolt.com> Newsgroups: sci.electronics.design Subject: Re: Design for long interval timer Date: 4 Dec 2002 07:44:22 -0800 Organization: Rowland Institute Message-ID: <asl7sm01f21@drn.newsguy.com> References: <9b5luu0klic7e7qsghsbcvic9hhc991iac@4ax.com> <iuyG9.88075$g9.247784@newsfeeds.bigpond.com> <4uaouu8h3ie11pktmgrco8i309vtaqk7oh@4ax.com> <jchouus0ja5llm9510jck6egsbj13fkiau@4ax.com> <3DEE0CAB.9020501@nospam.com> NNTP-Posting-Host: p-990.newsdawg.com X-Newsreader: Direct Read News 4.20 Fred Bloggs wrote... > > Spehro Pefhany wrote: >> >> for a timer.. consider using the MC14541. > > Hmmm...a few problems with one: > > 1) ON is dropping products left and right; The availability of '4541' timer chips is certainly as safe to rely on as any IC. It's a popular, venerable design, widely stocked at good prices, and manufactured by five companies: Philips, TI, ST, Fairchild, and ON Semi. I'd probably buy an ON Semi IC, because Motorola originated the design. > 2) the "exploded logic diagram" is clearly in error regarding the > MODE control logic; Use another vendor's data sheet if that bothers you. TI's data sheet (acquired from Harris = Intersil) has a good description. Of course one should always use the data sheet's Truth Table or Function table if in any doubt. > 3) the AUTO RESET only works for Vdd above 8.5V; "The AUTO RESET consumes an appreciable amount of power and should not be used if low-power operation is desired." Careful designers would consider avoiding use of a 'black-box' reset circuit anyway. The 4541 design has much to recommend it, hence its over 30 years of popularity. Most of us have used it successfully for a variety of tasks in some of our designs. Thanks, Spef for the suggestion and reminder. Thanks, - Win </b></pre></font><hr width="650"><a href="http://www.cyber-spy.com/electo-index.html"><font size="3">Go Back To The <a href="http://www.cyber-spy.com/">Cyber-Spy.Com</a><br>Usenet Web Archive Index Of<br>The sci.electronics.design Newsgroup</font></a><br><br></center></td><img src="http://cyber-spy.com/cgi-bin/livecntr.pl?0+1+unetsci" width="1" height="1" alt="The Cyber-Spy Toolkit - powerful internet spy software - live police scanners - usenet fbi secrets archive - newsgroup spy electronics archive - search engine spy tools - download TCST today!"> </tr> </table> </center> <center> <br><center><hr size="3"></center> <table width="100%" cellpadding="0" border="0" cellspacing="0"> <tr> <td align="left" valign="top"><small><b><i><a href="http://www.cyber-spy.com/index.html">Cyber-Spy.Com Live Resources</a></i></b></small></td> <td align="right" valign="top"><small> Copyright Alpha Omega Delta,<br> All rights reserved. </small></td> </tr> </table> <center><hr size="3"></center> <br><br> <br><br></center> </body></html>