Author Topic: FM24C256 drastic endurance difference ?!  (Read 963 times)

0 Members and 1 Guest are viewing this topic.

Offline nipilTopic starter

  • Contributor
  • Posts: 12
  • Country: fr
FM24C256 drastic endurance difference ?!
« on: May 22, 2023, 08:03:06 pm »
Hello, quick question, hopefully simple enough...

FM24C256 from Fairchild :
Endurance: up to 100K data changes

FM24C256 from Ramtron :
High Endurance 100 Billion (10^11) Read/Writes

How can the same référence, with the same technologue, have SIX ORDERS of magnitudes of difference ?!

Am i missing something ?

Thanks in advance
Nicolas
 

Offline voltsandjolts

  • Supporter
  • ****
  • Posts: 2549
  • Country: gb
Re: FM24C256 drastic endurance difference ?!
« Reply #1 on: May 22, 2023, 08:06:19 pm »
Fairchild device is an eeprom
 

Offline nipilTopic starter

  • Contributor
  • Posts: 12
  • Country: fr
Re: FM24C256 drastic endurance difference ?!
« Reply #2 on: May 22, 2023, 08:50:17 pm »
Fairchild device is an eeprom

Soooooo.... it seems i have bought the right name, from the wrong manufacturer, because it was cheaper. Great.

And... all that because i was not smart enough to guess that there could be two COMPLETELY different functions. How the hell can this happen ?!

It's the first time i stumble upon dissimilar references, is it something common or is it rare ? Should i be more attentive when shopping, as i usually only lookup references ?
« Last Edit: May 22, 2023, 08:52:26 pm by nipil »
 

Offline tom66

  • Super Contributor
  • ***
  • Posts: 7336
  • Country: gb
  • Electronics Hobbyist & FPGA/Embedded Systems EE
Re: FM24C256 drastic endurance difference ?!
« Reply #3 on: May 22, 2023, 09:42:16 pm »
You have made the unfortunate mistake of truncating the part number.

FM24C256-G for instance is one instance of a Fairchild/Onsemi part.

FM24C256N for instance is one instance of a Fairchild/Onsemi part.

"FM24C256" is just a type identifier for a non-volatile memory, the technology can be multiple types.  Though this is the first case I have seen of mixing FRAM and EEPROM... and I can't lie and say I wouldn't make the same mistake.
 

Offline Benta

  • Super Contributor
  • ***
  • Posts: 6420
  • Country: de
Re: FM24C256 drastic endurance difference ?!
« Reply #4 on: May 23, 2023, 12:32:48 am »
Well, would you blindly replace an M6 hardened steel bolt with some M6 decorative brass bolt?
Read the data sheets. I feel no pity, sorry.
 
The following users thanked this post: nipil

Offline nipilTopic starter

  • Contributor
  • Posts: 12
  • Country: fr
Re: FM24C256 drastic endurance difference ?!
« Reply #5 on: May 23, 2023, 05:45:06 am »
"FM24C256" is just a type identifier for a non-volatile memory, the technology can be multiple types. 
OK i now understand there could be "base IDs" for "function" and suffixes for "implementation details". So that is something i'll have to watch out for.

Well, would you blindly replace an M6 hardened steel bolt with some M6 decorative brass bolt?
Read the data sheets. I feel no pity, sorry.
If you read Ramtron datasheet, you will actually see that they name the component in it's short version "fm24c256", in what seems all of it, except the ordering information which adds "-S1" at the end, without telling what the suffix means (at least in rev 1.1 of the datasheet from 2001).

Fairchild adds clock and packaging information in the end of the package name, which is more "well known" for newcomers like me, who understood early that a suffix is often for packages (N for TH, for example) or other options

So my point was not about "not reading the datasheet", but the fact that shopping for references could be actually misleading. AFAIK, searching Digikey for FM24C256 only brings up Fairchild, so i thought that Ramtron was obsolete or had been bought back by Fairchild, or whatever.

Not all of us are electronics gurus, we all start to learn somewhere ; and even if we do not look for pity, when the way is paved with some hard-to-distinguish-details, i think there should be a clearer way for shopping sites.

Thanks for your help and have a nice day
Edit : typos
« Last Edit: May 23, 2023, 06:02:37 am by nipil »
 

Offline nipilTopic starter

  • Contributor
  • Posts: 12
  • Country: fr
Re: FM24C256 drastic endurance difference ?!
« Reply #6 on: May 23, 2023, 06:20:45 am »
Well, would you blindly replace an M6 hardened steel bolt with some M6 decorative brass bolt?
Read the data sheets. I feel no pity, sorry.

By the way, i'll take the bait.
Your example is misleading, because any fool on the planet (except for colorblind people, sadly) is capable of seeing the color difference, even if they do not know the name of the material nor their properties.

Actually, your example is even not that bad ... as you say "hardened steel", instead of O1 or A2 or whatever.
Which would actually prove your own point, that we should be more aware and watchful.

My point was not about learning the difference in the material.
But the fact that if you shop for A2 tool steel, and got O1 delivered, either be it because some idiot put the wrong label on it, or mis-sorted it in the bins,
or because the order instructions were not clear enough (having a capital i mistaken for a lowercase L, or a zero for an 0)
then you would not know a thing looking at it, or using it, except if you were actually expecting differences.

That was my point : if it looks like a duck, sounds like a duck, is should be clear that it is a freaking duck, not a chicken.
Just my 2 cents, but to each one his opinion
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf