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Hi!</div>
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Yes the FRAMs are a nice option... I still want to use them for DX7 and Casio-CZ sound cartridges some time.</div>
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The parameter that could be critical is the cycle time in the data sheet.</div>
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But as most synths are quite slow on the memory interface it will work in most cases I think.</div>
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Ciao<br>
Peter</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>Von:</b> Synth-diy <synth-diy-bounces@synth-diy.org> im Auftrag von Jean-Pierre Desrochers <jpdesroc@oricom.ca><br>
<b>Gesendet:</b> Sonntag, 25. April 2021 22:23<br>
<b>An:</b> 'synth-diy mailing list' <Synth-diy@synth-diy.org><br>
<b>Betreff:</b> *EXT* Re: [sdiy] Substituing M48Z18-100 (equ of DS1225AB-100) with 28 pins DIP small pcb</font>
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<span lang="EN-CA" style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#254061">I think I’ll go for the FM16W08-SG as suggested by Jason..<br>
No battery worrying and it seems to fit my needs..<br>
28SOIC package mounted on a SOIC to DIP carrier like this one:</span></p>
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<span lang="EN-CA" style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#254061">Thanks !</span></p>
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<span lang="EN-CA" style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
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<b><span lang="FR" style="font-size:10.0pt; font-family:"Tahoma","sans-serif"">De :</span></b><span lang="FR" style="font-size:10.0pt; font-family:"Tahoma","sans-serif""> Jason Tribbeck [mailto:jason@tribbeck.com]
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<b>Envoyé :</b> 25 avril 2021 13:00<br>
<b>À :</b> Jean-Pierre Desrochers<br>
<b>Cc :</b> synth-diy mailing list<br>
<b>Objet :</b> Re: [sdiy] Substituing M48Z18-100 (equ of DS1225AB-100) with 28 pins DIP small pcb</span></p>
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DS1225 does seem to still be available from Farnell: <a href="https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fuk.farnell.com%2Fmaxim-integrated-products%2Fds1225ab-70ind%2Fnv-sram-parallel-64kbit-edip-28%2Fdp%2F2798716&data=04%7C01%7CPeter.Ullrich%40kapsch.net%7Ca0274962ed934dbc4e9708d908288bba%7C5f9ce5277e3e4e83a8a4b6c848f85ab5%7C1%7C1%7C637549792517067813%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=9S9O%2Bumo2HbMrepR%2FT2qFerjp9qv2eYW0UX9%2BkH1VDs%3D&reserved=0" originalsrc="https://uk.farnell.com/maxim-integrated-products/ds1225ab-70ind/nv-sram-parallel-64kbit-edip-28/dp/2798716" shash="GAIfIFCuveZfc/b7v/zkjQ+5vU6xemJ+Wk0kfigmOf8CYhGBsjmIlSn3yxr1/UoH37YM6vn0oJXdMiKt/G9F2HjSy+k4sokcQWapVAXhcf+SYNeUWdpRQnbhmB8JTTk6kRAZdtH6uGFXn6mNNty1kNGQ9ceKalWkJaINMMVyEaY=">
https://uk.farnell.com/maxim-integrated-products/ds1225ab-70ind/nv-sram-parallel-64kbit-edip-28/dp/2798716</a></p>
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Or you could look at FRAM, for example Cypress FM16W08-SG : <a href="https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fuk.farnell.com%2Fcypress-semiconductor%2Ffm16w08-sg%2Ff-ram-non-vol-64kbit-soic-28%2Fdp%2F2772905&data=04%7C01%7CPeter.Ullrich%40kapsch.net%7Ca0274962ed934dbc4e9708d908288bba%7C5f9ce5277e3e4e83a8a4b6c848f85ab5%7C1%7C1%7C637549792517067813%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=eTkeZZ09y64lIscjuteMG5C2Fly2%2FEfrVdnXEzie%2BSA%3D&reserved=0" originalsrc="https://uk.farnell.com/cypress-semiconductor/fm16w08-sg/f-ram-non-vol-64kbit-soic-28/dp/2772905" shash="jslEPQpj+jSgmwvxsyI2+IyUhQ3tU5cwGb0Y+JO3S/g3zBS/K21hGDTX0GNWLeBB5TZQxZXip7NYTj7+k8wZXhmz0E12HPFZNYKyw2AGC7dGHuvclMC9Q9iN9DhkAlXWMa8hcGHdaaIkeX8RQXgnJ+RoeZ72oKRnL8AjV68IkLg=">
https://uk.farnell.com/cypress-semiconductor/fm16w08-sg/f-ram-non-vol-64kbit-soic-28/dp/2772905</a></p>
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I'm pretty sure FRAM can be used in the same way as SRAM.</p>
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On Sun, 25 Apr 2021 at 16:02, Jean-Pierre Desrochers <<a href="mailto:jpdesroc@oricom.ca">jpdesroc@oricom.ca</a>> wrote:</p>
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<span lang="EN-CA">Hi list,</span></p>
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<span lang="EN-CA" style="color:black">I need to replace a M48Z18-100PCI (8K x 8 battery backed SRAM) in one of my old<br>
test equipment. It's dated 1996 so It's inner battery life is ending.</span></p>
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<span lang="EN-CA" style="color:black">Yeah even after 25 years it still keeps its data.. (!!!)</span></p>
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<span lang="EN-CA" style="color:black">It's a 28 pins 600mil DIP package.</span></p>
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<span style="color:black"><img border="0" width="415" height="226" id="x_gmail-m_-5027867499528721670Image_x0020_2" data-outlook-trace="F:1|T:1" src="cid:image001.png@01D739EF.2FB9ED40"></span></p>
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<span lang="EN-CA" style="color:black"> </span></p>
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<span lang="EN-CA" style="color:black">The specs say it is full Dallas DS1225 compatible.</span></p>
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<span lang="EN-CA" style="color:black">There are many sites who show how to hack a DS1225 package<br>
to disconnect the inner battery tabs and connect small leads<br>
to an external battery keeping the still working SRAM.</span></p>
<p class="x_gmail-m-5027867499528721670msoplaintext" style="margin-right: 0cm; margin-left: 0cm; font-size: 12pt; font-family: "Times New Roman", serif;">
<span lang="EN-CA" style="color:black">This for example:</span></p>
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<span lang="EN-CA" style="color:black"><a href="https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.google.com%2Furl%3Fsa%3Dt%26rct%3Dj%26q%3D%26esrc%3Ds%26source%3Dweb%26cd%3D%26ved%3D2ahUKEwiDl_DKzZnwAhVdElkFHZaBCTsQFjABegQIAhAD%26url%3Dhttp%253A%252F%252Fworldphaco.com%252Fuploads%252FTEKTRONIX_2465b_OSCILLOSCOPE_CALIBRATION___REPOWERING_THE_DS1225.pdf%26usg%3DAOvVaw1WP8nMcsFuEALX2uMw2rP1&data=04%7C01%7CPeter.Ullrich%40kapsch.net%7Ca0274962ed934dbc4e9708d908288bba%7C5f9ce5277e3e4e83a8a4b6c848f85ab5%7C1%7C1%7C637549792517077806%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=yRkTS7GyqaWRIcExGkwmVejxd4OUdd3JnLQ5uaLsP8w%3D&reserved=0" originalsrc="https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwiDl_DKzZnwAhVdElkFHZaBCTsQFjABegQIAhAD&url=http%3A%2F%2Fworldphaco.com%2Fuploads%2FTEKTRONIX_2465b_OSCILLOSCOPE_CALIBRATION___REPOWERING_THE_DS1225.pdf&usg=AOvVaw1WP8nMcsFuEALX2uMw2rP1" shash="uY1T1cH6KAuSNuYJEBhCsjgo95VYhvzIoNgcZx0t2XUaJWZiTKKiI29iwSFM/tHKWCO6rOtHfQ+kiu3sYE8EZA/wAlXhQTpyoJTYglQfC6kNLkvPk13otyw5WFl2ODyqV/tWJ2GgA8Q6dbZCc3slOUfcHABnAu6kyQl1A+V76p0=" target="_blank">https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwiDl_DKzZnwAhVdElkFHZaBCTsQFjABegQIAhAD&url=http%3A%2F%2Fworldphaco.com%2Fuploads%2FTEKTRONIX_2465b_OSCILLOSCOPE_CALIBRATION___REPOWERING_THE_DS1225.pdf&usg=AOvVaw1WP8nMcsFuEALX2uMw2rP1</a></span></p>
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<span lang="EN-CA" style="color:black"><br>
Since my chip is a M48Z18-100PCI it does not have the same <br>
potted packing of a genuine DS1225 (should it ??) so dremeling it<br>
to reach the battery tabs would be quite hazardous..</span></p>
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<span lang="EN-CA" style="color:black"> </span></p>
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<b><span lang="EN-CA" style="font-size:16.0pt; color:black">So here is my question:</span></b></p>
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<span lang="EN-CA" style="color:black">I'd like to build a small 28 pins 600mils DIP pcb<br>
who would contain a 8Kx8 SRAM with battery controller IC<br>
the same way the inside DS1225 does it:</span></p>
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<span style="color:black"><img border="0" width="527" height="338" id="x_gmail-m_-5027867499528721670Image_x0020_1" data-outlook-trace="F:1|T:1" src="cid:image002.jpg@01D739EF.2FB9ED40"></span></p>
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<span lang="EN-CA" style="color:black">DS1218 and DS2064 are now obsolete ICs so this would not be a good choice..</span></p>
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<span lang="EN-CA" style="color:black"> </span></p>
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<span lang="EN-CA" style="color:black">A company called Glitch Works has this type of new substitute IC available:</span></p>
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<a href="https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.tindie.com%2Fproducts%2Fglitchwrks%2Fglitch-works-gw-1225-1-dallas-ds1225-replacement%2F&data=04%7C01%7CPeter.Ullrich%40kapsch.net%7Ca0274962ed934dbc4e9708d908288bba%7C5f9ce5277e3e4e83a8a4b6c848f85ab5%7C1%7C1%7C637549792517077806%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=rucOTTgO5gSJ1wlmNte3NrRIO2kN5Kog%2B7O9Y1M3Lfo%3D&reserved=0" originalsrc="https://www.tindie.com/products/glitchwrks/glitch-works-gw-1225-1-dallas-ds1225-replacement/" shash="xBbOB+bF+BIDmAxQVaOZwtyj5z5J1YfAMXa6dXf/3ugVM7ULz1J1GV3Ic/+QxQWJh4qogj7Aeta3lhnujtwQmkJIbDSep/7YpPXMk6xKv8Ws0yXp+TQIHJWzo17PFdsrja8UYX8R66Xx/t5jgalTEwEsFsZif51WxJjwHyCzgtA=" target="_blank"><span lang="EN-CA">https://www.tindie.com/products/glitchwrks/glitch-works-gw-1225-1-dallas-ds1225-replacement/</span></a></p>
<p class="x_gmail-m-5027867499528721670msoplaintext" style="margin-right: 0cm; margin-left: 0cm; font-size: 12pt; font-family: "Times New Roman", serif;">
<span lang="EN-CA" style="color:black">But for me $51.00US including shipping to Canada is too expensive..</span></p>
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<span lang="EN-CA" style="color:black">But the idea of a small 28 pins DIP pcb module is a good one..<br>
Building it would be fun too !</span></p>
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<span lang="EN-CA" style="color:black">I’m not an engineer and cannot figure out the DS1225 read/write needs to be taken care of<br>
choosing the right components. Any 8Kx8 SRAM with a 100ns acquisition should do<br>
but the choice of a good battery controller IC and the adequate connections between both IC’s<br>
and the 28 DIP pins to behave exactly like a M48Z18 or DS1225 exceeds my knowledge..</span></p>
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<span lang="EN-CA" style="color:black">Can you help with some possible IC’s and some easy wirings linking them ?</span></p>
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<span lang="EN-CA" style="color:black">Many thanks !</span></p>
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<span lang="EN-CA" style="color:black"> </span></p>
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<span lang="EN-CA" style="color:black"> </span></p>
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<span style="font-size:9.0pt; font-family:"Arial","sans-serif"">Confucius says: Man with problem who thinks solution is regular expression now has two problems.</span></p>
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<strong><span style="font-size:9.0pt">/s/two/many/</span></strong></p>
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