<div dir="ltr"><div>Hi,</div><div><br></div><div>As before, FRAM could be a good replacement. Cypress FM1808B-SG or FM18W08B-SG. Although as mentioned in the other thread, there may be incompatibilities in timings, so best to check.</div><div><br></div><div>The main difference could be if the TDS350 uses the partitioning feature of the DS1630AB (I'd not heard of that before). However, you'd have this problem if you went down the hybrid route anyway. If the partitioning feature is used, then basically your second option is going to be the best.<br></div><div><br></div><div>I would echo the important thing to do is copy the existing data off it first of all, and then figure out what to do with it.<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, 30 Apr 2021 at 21:12, Jean-Pierre Desrochers <<a href="mailto:jpdesroc@oricom.ca" target="_blank">jpdesroc@oricom.ca</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div lang="FR-CA"><div><p><span lang="EN-CA">I have a full functional old 90's Tektronix TDS350 that I use a lot.<u></u><u></u></span></p><p><span lang="EN-CA">I love this Faithfull scope but its Dallas non-volatile Ram DS1630AB-120 has a datecode 9430 (1994, 30th week !)<u></u><u></u></span></p><p><span lang="EN-CA">BUT it still keeps its calibration and data memory settings !! <u></u><u></u></span></p><p><span lang="EN-CA">Imagine.. more than 25 years after !<u></u><u></u></span></p><p><span lang="EN-CA">Well because I don't want to push my luck too far here<br>I decided to replace this Dallas RAM for something more reliable<br>for the next years to come..<u></u><u></u></span></p><p><span lang="EN-CA"><u></u> <u></u></span></p><p><b><span style="font-size:12pt" lang="EN-CA">2 choices:<u></u><u></u></span></b></p><p><b><span style="font-size:12pt" lang="EN-CA"><u></u> <u></u></span></b></p><p><span lang="EN-CA">Replace it with a small 28DIP600 pcb hybrid filled with<br>a non-volatile RAM controller IC + a 32k x 8 SRAM<br>using an external connected 3V lithium battery.<u></u><u></u></span></p><p><span lang="EN-CA"><u></u> <u></u></span></p><p><b><span style="font-size:12pt" lang="EN-CA">OR<u></u><u></u></span></b></p><p><span lang="EN-CA"><u></u> <u></u></span></p><p><span lang="EN-CA">Buy a genuine Tektronix Dalals DS1630AB-120 like these ones for sale at $14.99US each.<u></u><u></u></span></p><p><a href="https://www.qservice.tv/vpasp/shopexd.asp?id=12458&bc=no" target="_blank"><span lang="EN-CA">https://www.qservice.tv/vpasp/shopexd.asp?id=12458&bc=no</span></a><span lang="EN-CA"><u></u><u></u></span></p><p><span lang="EN-CA"><br></span>The seller quotes:<u></u><u></u></p><p><span lang="EN-CA">".. the date codes are 9510 or -1995, 10th week"<u></u><u></u></span></p><p><span lang="EN-CA">".. all these are genuine parts bought from the tektronix surplus store in Beaverton, "<u></u><u></u></span></p><p><span lang="EN-CA"><u></u> <u></u></span></p><p><span lang="EN-CA">Here I was aware of the inner battery life span left from the manufacturer's datecode.<br>But the actual DS1630AB specs page 10 says:<u></u><u></u></span></p><p><b><i><span style="font-size:12pt" lang="EN-CA">9 - Each DS1630 has a built-in switch that disconnects the lithium source until Vcc is first applied by the user.<br>The expected Tdr is defined as accumulative time in the absence of Vcc starting from the time power<br>is first applied by the user.<u></u><u></u></span></i></b></p><p><span lang="EN-CA"><u></u> <u></u></span></p><p><span lang="EN-CA">Sure these could have been connected at least once then the battery<br>countdown started OR these have never been used..<u></u><u></u></span></p><p><span lang="EN-CA"><u></u> <u></u></span></p><p><span lang="EN-CA">What do you think ?<u></u><u></u></span></p></div></div>_______________________________________________<br>
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</blockquote></div><br clear="all"><br>-- <br><div dir="ltr"><div dir="ltr"><div><span style="line-height:19px;font-size:12px"><font face="arial, helvetica, sans-serif">Confucius says: Man with problem who thinks solution is regular expression now has two problems.</font></span></div><blockquote style="margin-right:0px" dir="ltr"><div><span style="line-height:19px;font-size:12px"><strong>/s/two/many/</strong></span></div></blockquote></div></div>