X2210 and X2212 NVRAM - Page 1
Forum section: electronics / projects

author: jfphp
author_rank: Regular Contributor
timestamp: January 09, 2016, 11:20:26 am
content: Hello,I am facing, even with NOS parts, a general failure of the XIRCOR Non Volatile RAMs X2210 and X2212. I have not place enough to put DALLAS battery backed RAMs. Could anybody propose a substitute ? Thank you

author: MagicSmoker
author_rank: Super Contributor
timestamp: January 09, 2016, 12:19:35 pm
content: I very seriously doubt you will find a modern SRAM/EEPROM with a: A) parallel interface; B) 4b wide organization; C) Vcc of 5V; D) PDIP-18 package.This is a 30+ year old IC, after all.

author: amyk
author_rank: Super Contributor
timestamp: January 09, 2016, 05:48:00 pm
content: http://www.onsemi.com/PowerSolutions/product.do?id=CAT22C10http://www.jameco.com/1/1/50788-cat22c10pit-30-256-bit-nonvolatile-cmos-static-ram-single-5v-supply-nvsram.htmlhttp://www.electronicsurplus.com/catalyst-cat22c12p-30-ic-sram-non-volatile-nvrams-18-dipI don't know why the 1K version is so much more expensive, but apparently it's still manufactured for military applications.

author: MagicSmoker
author_rank: Super Contributor
timestamp: January 09, 2016, 09:06:35 pm
content: Quote from: amyk on January 09, 2016, 05:48:00 pmWell, I stand corrected - nice find!

author: jfphp
author_rank: Regular Contributor
timestamp: January 10, 2016, 11:21:46 am
content: Thank you for answer. I do know the CAT22C10 but the main problem is the --C12 (X2212) apparently no more manufactured. I have to support form some years a lot of equipments with X2210 and essentialy X2212. I have bought many many X2212 IC on the US surplus market but all died very quicly with temperature changes and in some cases with vibrations. I am looking for a long term solution. The number of IC involved in not enough to allow a custom IC by a specialized manufacturer. I have tried a home made SMC hybrid adapter with a ram, an EEPROM and a PIC but, during the start, the recovery time from the EEPROM is too long and modifying the software is too tricky ; therefor my question in the forum.

author: MagicSmoker
author_rank: Super Contributor
timestamp: January 10, 2016, 12:12:59 pm
content: Quote from: jfphp on January 10, 2016, 11:21:46 amI am always surprised - though I shouldn't be by now - when a company tries to hang on to a hardware design that is so old it could be in a museum. The sensible thing to do here is redesign the board and/or product to use modern components - this is just something that has to be done if you want to stay in business - but assuming management is too pointy-haired to learn this lesson anyway but the hard way, and given that you've already tried to kludge something with an EEPROM and MCU, I would consider using a small FPGA (CPLD, really) to emulate this 256b SRAM.

author: branadic
author_rank: Super Contributor
timestamp: May 14, 2023, 08:44:54 am
content: I found this one on the web:https://webcache.googleusercontent.com/search?q=cache:E-uMtBFN93cJ:https://www.arcadeitalia.net/viewtopic.php%3Ft%3D31042&cd=3&hl=de&ct=clnk&gl=de-branadic-

author: coromonadalix
author_rank: Super Contributor
timestamp: May 14, 2023, 10:50:02 am
content: They have 0 adapters on handAnd for the used old depreciated technology, sometimes you're stuck with theses ......we had old xylinx xc95 series, managed to do some substitutes with ATF1504 ... but lost an option, but still workBut sometimes you can not access or find or get the old designs, codes, schematics etc .... people left ...and yes the final thing is to redesign