Arduino Forum

Using Arduino => General Electronics => Topic started by: sreedevk on Jan 05, 2013, 02:43 pm

Title: EEPROM IC
Post by: sreedevk on Jan 05, 2013, 02:43 pm
Hi,
can someone tell me about an EEPROM IC with atleast 250kb memory?
Title: Re: EEPROM IC
Post by: dc42 on Jan 05, 2013, 03:01 pm
If by 250kb you mean 250kbytes, your best solution may be an SD card. Or use two of these 1Mbit chips http://www.onsemi.com/pub_link/Collateral/CAT24M01-D.PDF (http://www.onsemi.com/pub_link/Collateral/CAT24M01-D.PDF), or similar 1Mbit chips from other manufacturers.
Title: Re: EEPROM IC
Post by: sreedevk on Jan 05, 2013, 03:32 pm
is there any around 150 kbytes?
Title: Re: EEPROM IC
Post by: retrolefty on Jan 05, 2013, 04:26 pm

If by 250kb you mean 250kbytes, your best solution may be an SD card. Or use two of these 1Mbit chips http://www.onsemi.com/pub_link/Collateral/CAT24M01-D.PDF (http://www.onsemi.com/pub_link/Collateral/CAT24M01-D.PDF), or similar 1Mbit chips from other manufacturers.


I always took 250kb to mean 250,000 bits where as 250kB means 250,000 bytes ?

Lefty
Title: Re: EEPROM IC
Post by: dc42 on Jan 05, 2013, 04:32 pm

is there any around 150 kbytes?


The largest I could find in a single chip in standard packaging were 1Mbit, however they are mostly designed so that you can put up to 4 of them on the same serial bus.
Title: Re: EEPROM IC
Post by: Grumpy_Mike on Jan 05, 2013, 04:39 pm

is there any around 150 kbytes?


Memory always has a bit size that is a power of two.
This link will show you most of what is available:-
http://uk.farnell.com/jsp/search/browse.jsp?N=2031+204558&Ntk=gensearch&Ntt=EEPROM&Ntx=mode+matchallpartial (http://uk.farnell.com/jsp/search/browse.jsp?N=2031+204558&Ntk=gensearch&Ntt=EEPROM&Ntx=mode+matchallpartial)
Title: Re: EEPROM IC
Post by: oric_dan on Jan 05, 2013, 07:37 pm
Besides the I2C eeproms that G_M mentioned, there are also SPI eeproms of the same
size, 128KBytes,

http://www.digikey.com/product-detail/en/23A1024-I%2FP/23A1024-I%2FP-ND/3543080

In addition, there are SPI Flash rom chips much larger, up to 16MBits and more, but I believe
all of these operate at 3.3V only.

http://www.digikey.com/product-search/en/integrated-circuits-ics/memory/2556980?k=flash%20spi
Title: Re: EEPROM IC
Post by: Jack Christensen on Jan 05, 2013, 08:48 pm
I just happened to be looking at ST Micro parts, 1Mbit and 2Mbit (128Kx8 and 256Kx8), these look pretty nice, e.g. M24M01-RMN6TP, M24M02-DRMN6TP. Was hoping to find some cost-competitive FRAM, but am still looking.


Memory always has a bit size that is a power of two.


Except for disk drive manufacturers, who, in an effort to make customers think they were getting more than they were, decided to define sizes in powers of ten, which is why my OS reports my so-called "750GB" drive as 676GB.

The disk manufacturers were the subject of a class-action lawsuit because of this practice; I was inadvertently part of it because I registered some disk I bought with the manufacturer. The settlement was a free download of some schlock software package that I didn't even bother with. As usual with such things, only the lawyers made money. The manufacturers were allowed to continue this practice, and just had to add cautionary language to their capacity specs. To this day I still suffer from the mental anguish and emotional scarring caused by the missing gigabytes :smiley-roll-blue: