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The good old but useful MAX691 are also still in production.</div>
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The MAX690 family of supervisory circuits reduces the complexity and number of components required for power supply monitoring and battery control functions in microprocessor systems. These include ĶP reset and backup-battery switchover, watchdog time</div>
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VCC = full operating range, VBATT = 2.8V, TA = +25įC, unless otherwise noted.) Note 1: The input voltage limits on PFI and WDI may be exceeded provided the input current is limited to less than 10mA. Note 2: WDI is guaranteed to be in the mid-level (inactive)
 state if WDI is floating and VCC is in the operating voltage range. WDI is internally biased to 38% of VCC with an impedance of ...</div>
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<p class="MsoNormal">Ciao<br>
Peter <br>
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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 17:59<br>
<b>An:</b> Synth-diy@synth-diy.org <Synth-diy@synth-diy.org><br>
<b>Betreff:</b> *EXT* [sdiy] Substituing M48Z18-100 (equ of DS1225AB-100) with 28 pins DIP small pcb .. found something..</font>
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<span lang="EN-CA" style="color:#1F497D">I think Iíve found 2 ICís that could do the job (I think..)</span><span lang="EN-CA"></span></p>
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<span lang="EN-CA" style="color:#1F497D">SRAM non-volatile controller in 8SOIC package:</span></p>
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<b><span lang="EN-CA" style="color:#1F497D">BQ2201SN-N</span></b></p>
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<span lang="EN-CA" style="color:#1F497D"><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%3D2ahUKEwiasOzR35nwAhVqGFkFHTluCykQFjAAegQIAxAD%26url%3Dhttps%253A%252F%252Fwww.ti.com%252Flit%252Fgpn%252Fbq2201%26usg%3DAOvVaw06LYSkBSK_1TQIIAxQiouX&data=04%7C01%7CPeter.Ullrich%40kapsch.net%7C15e3d4bf1cab402ba06908d90805501a%7C5f9ce5277e3e4e83a8a4b6c848f85ab5%7C1%7C1%7C637549641189051369%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=0EkUrZ5CIXKbNMB5%2FIVrMpneydyFm9%2BV1hBzE%2Bp3zbw%3D&reserved=0" originalsrc="https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwiasOzR35nwAhVqGFkFHTluCykQFjAAegQIAxAD&url=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Fbq2201&usg=AOvVaw06LYSkBSK_1TQIIAxQiouX" shash="ev4cVUEMaXho91HPhpiuDmoXsXm11A1XatHOZkJjZx/YRViFr8YW2KimNmSxHapyvXIyzG+w9b5vKALoWAplR5y64VBwqc5CEChy/xDVAYGKuQODTzU6Yuh5szKJDhKHPV0vM7XU4bGGyXGwMYdwOSIfhD6JYBqbh5Z+6JYLL/Q=">https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwiasOzR35nwAhVqGFkFHTluCykQFjAAegQIAxAD&url=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Fbq2201&usg=AOvVaw06LYSkBSK_1TQIIAxQiouX</a></span></p>
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<span lang="EN-CA" style="color:#1F497D">SRAM 8K x 8 <b>( Data retention voltage :1.5V min)
</b>in 28SOP package:<b></b></span></p>
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<b><span lang="EN-CA" style="color:#1F497D">AS6C6264-55SCN</span></b><b><span lang="EN-CA" style="font-size:10.0pt; font-family:ArialMT"></span></b></p>
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<span lang="EN-CA"><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%3D2ahUKEwidspDy35nwAhUNGVkFHbHkDlUQFjADegQIAhAD%26url%3Dhttps%253A%252F%252Fwww.alliancememory.com%252Fwp-content%252Fuploads%252Fpdf%252FAlliance%252520Memory_64K_AS6C6264v2.0July2017.pdf%26usg%3DAOvVaw1OWQu_vBHdlEtp0o5PSFeO&data=04%7C01%7CPeter.Ullrich%40kapsch.net%7C15e3d4bf1cab402ba06908d90805501a%7C5f9ce5277e3e4e83a8a4b6c848f85ab5%7C1%7C1%7C637549641189061364%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=XOsKdB4JsJxucvhMLtiIBh5ofPljhMPbGrES4fBwkCw%3D&reserved=0" originalsrc="https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwidspDy35nwAhUNGVkFHbHkDlUQFjADegQIAhAD&url=https%3A%2F%2Fwww.alliancememory.com%2Fwp-content%2Fuploads%2Fpdf%2FAlliance%2520Memory_64K_AS6C6264v2.0July2017.pdf&usg=AOvVaw1OWQu_vBHdlEtp0o5PSFeO" shash="JtSoLEqkw0kHVrhol7j9zv1Mz0nweoBivaSb7tVZTgY0Fqo+WdmZkq347Ei0hMlm47WAEyvonNwiBvDZIh3UoQrZdEcDeVIMbd1bzO4Cfv0pGq9HjE3z4MxACWawFPR6C0RAdDbcvF+3dogKOfThlJFO2myeVR11u/8uOIDMcgE=">https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwidspDy35nwAhUNGVkFHbHkDlUQFjADegQIAhAD&url=https%3A%2F%2Fwww.alliancememory.com%2Fwp-content%2Fuploads%2Fpdf%2FAlliance%2520Memory_64K_AS6C6264v2.0July2017.pdf&usg=AOvVaw1OWQu_vBHdlEtp0o5PSFeO</a></span></p>
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<span lang="EN-CA"></span><span lang="EN-CA" style="color:#1F497D"></span></p>
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<span lang="EN-CA" style="color:#1F497D">Both ICís cost not exceeding $15.00CAD !</span></p>
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<span lang="EN-CA" style="color:#1F497D">The connections between both ICíS is simple:</span></p>
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<span style="color:#1F497D"><img border="0" width="673" height="268" id="x__x0000_i1027" data-outlook-trace="F:1|T:1" src="cid:image001.png@01D739CA.258B4460"></span><span lang="EN-CA" style="color:#1F497D"></span></p>
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<span lang="EN-CA" style="color:#1F497D">But I will use only one battery connected at BC1, (BC2 tied to VSS).</span></p>
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<span lang="EN-CA" style="color:#1F497D"> </span></p>
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<span lang="EN-CA" style="color:#1F497D"><br>
Should I use any supply 0.1uf + 10uf caps on the final small pcb. ?</span></p>
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<span lang="EN-CA" style="color:#1F497D"> </span></p>
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<span lang="EN-CA" style="color:#1F497D"> </span></p>
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<span lang="EN-CA" style="color:#1F497D"> </span></p>
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<span lang="EN-CA" style="color:#1F497D"> </span></p>
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<span lang="EN-CA" style="color:#1F497D">*************************************************************************</span></p>
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<span lang="EN-CA" style="color:#1F497D"> </span></p>
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<span lang="EN-CA" style="">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_Image_x0020_2" data-outlook-trace="F:1|T:1" src="cid:image003.png@01D739C1.784777E0"></span><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 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>
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<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%7C15e3d4bf1cab402ba06908d90805501a%7C5f9ce5277e3e4e83a8a4b6c848f85ab5%7C1%7C1%7C637549641189061364%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=mZuDKIUN3kP2I7ymDv6c8FJV6%2FTAvS%2BtK%2FL86cgvcdo%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="NixS/QYASp4NCVSVDJrqh1MAwRvv+rFPQ+7hlx6xojH5zM+5VFXyDR8i0KOz+j6vDYtbYIxLEMN34Lh0ESLs3WWsP4idRQxU14fugdYMp/QM2EXeHQD3zTPLipWELYN1UvWuEXbC0hYz5N0/nGF4WCipcop3o9xr6aN/FnXPXxQ=">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_Image_x0020_1" data-outlook-trace="F:1|T:1" src="cid:image002.jpg@01D739C1.B7188DB0"></span><span lang="EN-CA" style="color:black"></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%7C15e3d4bf1cab402ba06908d90805501a%7C5f9ce5277e3e4e83a8a4b6c848f85ab5%7C1%7C1%7C637549641189071353%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=3q0xzHQwYk6EOFE20JG08yTc6H5Z8pDfKSMFMqbHDLI%3D&reserved=0" originalsrc="https://www.tindie.com/products/glitchwrks/glitch-works-gw-1225-1-dallas-ds1225-replacement/" shash="ve1TMmrs1DFHeT06kh5JB83vnR/+KJAeoFsrMrEll2A2HES6GraoYe3o3WpnCagdbHzzV3conh0uVjU4awbgGxzgUTz8SuSSNiKFbzONkx4ZLONEJ1DZkRC2jkOaNNuiIaA0ap+wm2NDcop3zKi5UG0WUxmQeOXyY3k4Qpy0HDg="><span lang="EN-CA">https://www.tindie.com/products/glitchwrks/glitch-works-gw-1225-1-dallas-ds1225-replacement/</span></a><span lang="EN-CA"></span></p>
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<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">Iím 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 ICís<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 ICís 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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