[sdiy] Substituing M48Z18-100 (equ of DS1225AB-100) with 28 pins DIP small pcb

Ullrich Peter Peter.Ullrich at kapsch.net
Mon Apr 26 08:26:54 CEST 2021


Hi Joan!

I think you are thinking of different memories - not FRAM.

Out of the FM16W08 datasheet:

- High-endurance 100 trillion (10^14) read/writes
- 151-year data retention (see the Data Retention and Endurance table)

So using it as an SRAM is OK for unit that don't have to work for 30+ years (of course depending on the
number of read/write cycles) but I am sure that you can never reach 10^14 manual patch writing operations in your whole life).

Ciao
Peter

-----Ursprüngliche Nachricht-----
Von: Synth-diy <synth-diy-bounces at synth-diy.org> Im Auftrag von Joan Touzet
Gesendet: Montag, 26. April 2021 01:20
An: synth-diy at synth-diy.org
Betreff: *EXT* Re: [sdiy] Substituing M48Z18-100 (equ of DS1225AB-100) with 28 pins DIP small pcb

They also have a much more limited number of cycles per cell as compared with SRAM. I believe when I last checked it was on the order of 20k cycles per cell.

If you're using them as replacement for rarely-modified patches (as on a
cartridge) you're probably fine. I would not recommend them for replacing general RAM in a synth or computer.

-Joan

On 25/04/2021 18:57, Ullrich Peter via Synth-diy wrote:
> Hi!
>
> Yes the FRAMs are a nice option... I still want to use them for DX7
> and Casio-CZ sound cartridges some time.
>
> The parameter that could be critical is the cycle time in the data sheet.
> But as most synths are quite slow on the memory interface it will work
> in most cases I think.
>
> Ciao
> Peter
>
>
>
>
> ----------------------------------------------------------------------
> --
> *Von:* Synth-diy <synth-diy-bounces at synth-diy.org> im Auftrag von
> Jean-Pierre Desrochers <jpdesroc at oricom.ca>
> *Gesendet:* Sonntag, 25. April 2021 22:23
> *An:* 'synth-diy mailing list' <Synth-diy at synth-diy.org>
> *Betreff:* *EXT* Re: [sdiy] Substituing M48Z18-100 (equ of
> DS1225AB-100) with 28 pins DIP small pcb
>
>
> I think I'll go for the FM16W08-SG as suggested by Jason..
> No battery worrying and it seems to fit my needs..
> 28SOIC package mounted on a SOIC to DIP carrier like this one:
>
> Thanks !
>
>
>
>
>
> *De :*Jason Tribbeck [mailto:jason at tribbeck.com] *Envoyé :* 25 avril
> 2021 13:00 *À :* Jean-Pierre Desrochers *Cc :* synth-diy mailing list
> *Objet :* Re: [sdiy] Substituing M48Z18-100 (equ of DS1225AB-100) with
> 28 pins DIP small pcb
>
>
>
> DS1225 does seem to still be available from Farnell:
> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fuk.f
> arnell.com%2Fmaxim-integrated-products%2Fds1225ab-70ind%2Fnv-sram-para
> llel-64kbit-edip-28%2Fdp%2F2798716&data=04%7C01%7CPeter.Ullrich%40
> kapsch.net%7C8fc66b6778464eb2e27308d908412687%7C5f9ce5277e3e4e83a8a4b6
> c848f85ab5%7C1%7C1%7C637549898198643338%7CUnknown%7CTWFpbGZsb3d8eyJWIj
> oiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&am
> p;sdata=JqPdZHYlyxa%2B4n6U8qRRi654esVoCY%2BUs3iqWZcLQsc%3D&reserve
> d=0
> <https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fuk.
> farnell.com%2Fmaxim-integrated-products%2Fds1225ab-70ind%2Fnv-sram-par
> allel-64kbit-edip-28%2Fdp%2F2798716&data=04%7C01%7CPeter.Ullrich%4
> 0kapsch.net%7C8fc66b6778464eb2e27308d908412687%7C5f9ce5277e3e4e83a8a4b
> 6c848f85ab5%7C1%7C1%7C637549898198643338%7CUnknown%7CTWFpbGZsb3d8eyJWI
> joiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&a
> mp;sdata=JqPdZHYlyxa%2B4n6U8qRRi654esVoCY%2BUs3iqWZcLQsc%3D&reserv
> ed=0>
>
>
>
> Or you could look at FRAM, for example Cypress FM16W08-SG :
> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fuk.f
> arnell.com%2Fcypress-semiconductor%2Ffm16w08-sg%2Ff-ram-non-vol-64kbit
> -soic-28%2Fdp%2F2772905&data=04%7C01%7CPeter.Ullrich%40kapsch.net%
> 7C8fc66b6778464eb2e27308d908412687%7C5f9ce5277e3e4e83a8a4b6c848f85ab5%
> 7C1%7C1%7C637549898198643338%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwM
> DAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=auR
> 35nwI2iB9jxDIScBEWenvI7uxM0YScF9jsftu%2Fvs%3D&reserved=0
> <https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fuk.
> farnell.com%2Fcypress-semiconductor%2Ffm16w08-sg%2Ff-ram-non-vol-64kbi
> t-soic-28%2Fdp%2F2772905&data=04%7C01%7CPeter.Ullrich%40kapsch.net
> %7C8fc66b6778464eb2e27308d908412687%7C5f9ce5277e3e4e83a8a4b6c848f85ab5
> %7C1%7C1%7C637549898198643338%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAw
> MDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=au
> R35nwI2iB9jxDIScBEWenvI7uxM0YScF9jsftu%2Fvs%3D&reserved=0>
>
>
>
> I'm pretty sure FRAM can be used in the same way as SRAM.
>
>
>
> On Sun, 25 Apr 2021 at 16:02, Jean-Pierre Desrochers
> <jpdesroc at oricom.ca <mailto:jpdesroc at oricom.ca>> wrote:
>
>     Hi list,
>
>     I need to replace a M48Z18-100PCI (8K x 8 battery backed SRAM) in
>     one of my old
>     test equipment. It's dated 1996 so It's inner battery life is ending.
>
>     Yeah even after 25 years it still keeps its data.. (!!!)
>
>     It's a 28 pins 600mil DIP package.
>
>
>
>     The specs say it is full Dallas DS1225 compatible.
>
>     There are many sites who show how to hack a DS1225 package
>     to disconnect the inner battery tabs and connect small leads
>     to an external battery keeping the still working SRAM.
>
>     This for example:
>
>     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%7C8fc66b6778464eb2e27308d908412687%7C5f9ce5277e3e4e83a8a4b6c848f85ab5%7C1%7C1%7C637549898198643338%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=qU%2BoEGKp3n7n%2FIN92T0P9onoQUQ%2Fx9UdcZtu%2BxZkrgo%3D&reserved=0
>
> <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%3D
> http%253A%252F%252Fworldphaco.com%252Fuploads%252FTEKTRONIX_2465b_OSCI
> LLOSCOPE_CALIBRATION___REPOWERING_THE_DS1225.pdf%26usg%3DAOvVaw1WP8nMc
> sFuEALX2uMw2rP1&data=04%7C01%7CPeter.Ullrich%40kapsch.net%7C8fc66b
> 6778464eb2e27308d908412687%7C5f9ce5277e3e4e83a8a4b6c848f85ab5%7C1%7C1%
> 7C637549898198643338%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQI
> joiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=qU%2BoEGKp3
> n7n%2FIN92T0P9onoQUQ%2Fx9UdcZtu%2BxZkrgo%3D&reserved=0>
>
>
>     Since my chip is a M48Z18-100PCI it does not have the same
>     potted packing of a genuine DS1225 (should it ??) so dremeling it
>     to reach the battery tabs would be quite hazardous..
>
>
>
>     *So here is my question:*
>
>     I'd like to build a small 28 pins 600mils DIP pcb
>     who would contain a 8Kx8 SRAM with battery controller IC
>     the same way the inside DS1225 does it:
>
>     DS1218 and DS2064 are now obsolete ICs so this would not be a good
>     choice..
>
>
>
>     A company called Glitch Works has this type of new substitute IC
>     available:
>
>     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%7C8fc66b6778464eb2e27308d908412687%7C5f9ce5277e3e4e83a8a4b6c848f85ab5%7C1%7C1%7C637549898198653333%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=omdbsa3iVKJMe5oM4julxWktnFk6BwhceSb1AAfEMG4%3D&reserved=0
>
> <https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww
> .tindie.com%2Fproducts%2Fglitchwrks%2Fglitch-works-gw-1225-1-dallas-ds
> 1225-replacement%2F&data=04%7C01%7CPeter.Ullrich%40kapsch.net%7C8f
> c66b6778464eb2e27308d908412687%7C5f9ce5277e3e4e83a8a4b6c848f85ab5%7C1%
> 7C1%7C637549898198653333%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiL
> CJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=omdbsa3
> iVKJMe5oM4julxWktnFk6BwhceSb1AAfEMG4%3D&reserved=0>
>
>     But for me $51.00US including shipping to Canada is too expensive..
>
>     But the idea of a small 28 pins DIP pcb module is a good one..
>     Building it would be fun too !
>
>     I'm not an engineer and cannot figure out the DS1225 read/write
>     needs to be taken care of
>     choosing the right components. Any 8Kx8 SRAM with a 100ns
>     acquisition should do
>     but the choice of a good battery controller IC and the adequate
>     connections between both IC's
>     and the 28 DIP pins to behave exactly like a M48Z18 or DS1225
>     exceeds my knowledge..
>
>     Can you help with some possible IC's and some easy wirings linking
>     them ?
>
>     Many thanks !
>
>
>
>
>
>     _______________________________________________
>     Synth-diy mailing list
>     Synth-diy at synth-diy.org <mailto:Synth-diy at synth-diy.org>
>     https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fsynth-diy.org%2Fmailman%2Flistinfo%2Fsynth-diy&data=04%7C01%7CPeter.Ullrich%40kapsch.net%7C8fc66b6778464eb2e27308d908412687%7C5f9ce5277e3e4e83a8a4b6c848f85ab5%7C1%7C1%7C637549898198653333%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=xbzyHHr1J%2BLquzg5Qh98XLYWpeorkiSXXEtEryirtaQ%3D&reserved=0
>     <https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fsynth-diy.org%2Fmailman%2Flistinfo%2Fsynth-diy&data=04%7C01%7CPeter.Ullrich%40kapsch.net%7C8fc66b6778464eb2e27308d908412687%7C5f9ce5277e3e4e83a8a4b6c848f85ab5%7C1%7C1%7C637549898198653333%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=xbzyHHr1J%2BLquzg5Qh98XLYWpeorkiSXXEtEryirtaQ%3D&reserved=0>
>     Selling or trading? Use marketplace at synth-diy.org
>     <mailto:marketplace at synth-diy.org>
>
>
>
> --
>
> Confucius says: Man with problem who thinks solution is regular
> expression now has two problems.
>
>     */s/two/many/*
>
>
>
>
> The information contained in this e-mail message is privileged and
> confidential and is for the exclusive use of the addressee. The person
> who receives this message and who is not the addressee, one of his
> employees or an agent entitled to hand it over to the addressee, is
> informed that he may not use, disclose or reproduce the contents
> thereof, and is kindly asked to notify the sender and delete the
> e-mail immediately.
>
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at synth-diy.org
> https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fsynth
> -diy.org%2Fmailman%2Flistinfo%2Fsynth-diy&data=04%7C01%7CPeter.Ull
> rich%40kapsch.net%7C8fc66b6778464eb2e27308d908412687%7C5f9ce5277e3e4e8
> 3a8a4b6c848f85ab5%7C1%7C1%7C637549898198653333%7CUnknown%7CTWFpbGZsb3d
> 8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C
> 3000&sdata=xbzyHHr1J%2BLquzg5Qh98XLYWpeorkiSXXEtEryirtaQ%3D&re
> served=0 Selling or trading? Use marketplace at synth-diy.org
>
_______________________________________________
Synth-diy mailing list
Synth-diy at synth-diy.org
https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fsynth-diy.org%2Fmailman%2Flistinfo%2Fsynth-diy&data=04%7C01%7CPeter.Ullrich%40kapsch.net%7C8fc66b6778464eb2e27308d908412687%7C5f9ce5277e3e4e83a8a4b6c848f85ab5%7C1%7C1%7C637549898198653333%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=xbzyHHr1J%2BLquzg5Qh98XLYWpeorkiSXXEtEryirtaQ%3D&reserved=0
Selling or trading? Use marketplace at synth-diy.org



The information contained in this e-mail message is privileged and confidential and is for the exclusive use of the addressee. The person who receives this message and who is not the addressee, one of his employees or an agent entitled to hand it over to the addressee, is informed that he may not use, disclose or reproduce the contents thereof, and is kindly asked to notify the sender and delete the e-mail immediately.




More information about the Synth-diy mailing list