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Author Topic: How old is this SRAM?  (Read 2086 times)

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Offline amperiumTopic starter

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How old is this SRAM?
« on: July 04, 2015, 08:45:03 am »
Hello,
I recently bought an old machine. I saw that there is an SRAM with internal battery in it. Can anyone tell me how old this one is? And how long the battery typically lasts (data sheet: min. 10 years)?

Chip:
DALLAS
DS1225Y - 150
NONVOLATILVE SRAM
0331S 336959
PHILIPPINES


Thanks!

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Offline dom0

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Re: How old is this SRAM?
« Reply #1 on: July 04, 2015, 08:52:27 am »
0331 could mean 2003, calendar week 31.
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Offline amperiumTopic starter

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Re: How old is this SRAM?
« Reply #2 on: July 04, 2015, 08:55:22 am »
Thanks a lot! I definitely should save the data on is!
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Offline nali

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Re: How old is this SRAM?
« Reply #3 on: July 04, 2015, 09:06:59 am »
Quote from: dom0 on July 04, 2015, 08:52:27 am
0331 could mean 2003, calendar week 31.

That's the format according to the data sheet, the life is from the date of manufacture. I guess the true state of the battery depends a lot on how long the equipment has been powered off.

They're still available, not especially cheap though.
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Offline amperiumTopic starter

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Re: How old is this SRAM?
« Reply #4 on: July 04, 2015, 09:09:55 am »
Okay thanks! Costs are not an issue. The man where I bought the machine lost the data once. It cost him about 3000 Euro to get the data and a new chip, because no body cares about this device anymore, its simply too old.
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Offline justanothercanuck

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Re: How old is this SRAM?
« Reply #5 on: July 05, 2015, 02:28:51 am »
If it really is non-volatile, then it might be possible that the battery is connected to something else.  FWIW, Maxim's version of the DS1225Y says data can persist for 10 years unpowered.

http://www.maximintegrated.com/en/products/digital/memory-products/DS1225Y.html
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Maintain your old electronics!  If you don't preserve it, it could be lost forever!
 
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