EEPROM

GoogleGroups
1

The AT24C01 parts in the "official reference schematic" is listed as "not
recomended for new designs" per the part's web page -
http://www.atmel.com/dyn/products/product_card.asp?part_id=2772

Is there a recommended alternative part so we all don't randomly pick
different EEPROMs?

The 24AA01 part seems like a reasonable alternative.

2

What is wrong with the ATC24C01B? That is their recommended replacement.

Gerald

3

What is wrong with the ATC24C01B? That is their recommended replacement.

Gerald

Do you mean the AT24C01B? I couldn't find a ATC24C01B datasheet.

Digikey lists the AT24C01B in SOT23-5 as nonstocked whereas the 24AA01 in
SOT23-5 is listed as a stocked part.

4

Well, I found over 120,000 pieces at various distributors. http://www.stkcheck.com/evs/atmel/atmelheader2.asp?mfg=atmel&part=AT24C01B

Almost 4000 at DigiKey in an 8 pin dip package http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=AT24C01B-PU-ND

Gerald

5

None of those are SOT23 unless misdecoded the suffix. Of the packages, the
SOT23 is the smallest of the leaded package.

6

So, you want to have a SOT-23? Why?

Gerald

7

I think you can use 24AA01 from Microchip, this one has SOT23 package. It has 8-byte page write in compare with 4-byte page write of Atmel part.

But I think this will not cause any problem since 4-byte page write code should work correctly.

8

We will be sticking with the ATC24C01B. We already have boards with it on it.

Gerald

9

So, you want to have a SOT-23? Why?

Size. No room to squeeze in a larger part. The pad layout of the SOT23-5 foot
print allows a tiny bit more room to squeeze in vias.

10

I think you can use 24AA01 from Microchip, this one has SOT23 package. It
has 8-byte page write in compare with 4-byte page write of Atmel part.

But I think this will not cause any problem since 4-byte page write code
should work correctly.

Yes. And I aware that the important part is being read compatible. Once the
contents are available, we can branch to do different things.

However, it would be nice to have sanctioned 2nd sources for the part that we
are tryng to standardize on. I think it is also important to have options for
different packages to so the id prom can be added with minimal impact on the
board.

11

I will stick with the ATC24C10B. If you choose to deviate, that is your call.

Gerald