Using non-Atmel EEPROM with BasicX 35

Started by flyerx_2000 August 12, 2005
Hello,

I wanted to use an Atmel 25256 EEPROM with a BasicX 35. Unfortunately
according to Mouser this chip has been discontinued (both voltage
variants). They recommended the ST M95256. It is SPI with 32K and
seems pin compatible. Has anyone here used a non-Atmel EEPROM? I would
suspect they are fairly standard and should be interchangeable but I
wanted to make sure.

I know I can get the Atmel chip at Digikey and some other places but I
want to use a production part since this is for a prospective
commercial device.

I have not checked with Atmel if this chip has been really
discontinued. I will call them after the weekend.

regards,

FlyerX


flyerx_2000 wrote:

> I wanted to use an Atmel 25256 EEPROM with a BasicX 35. Unfortunately
> according to Mouser this chip has been discontinued (both voltage
> variants). They recommended the ST M95256. It is SPI with 32K and
> seems pin compatible. Has anyone here used a non-Atmel EEPROM? I would
> suspect they are fairly standard and should be interchangeable but I
> wanted to make sure.

The criteria to watch out for is page writes versus single byte writes.
BasicX needs SPI EEPROMs that support single byte writes. Also watch out
for SPI modes, voltage and temperature of course. Mouser also have a
similar chip from Catalyst. The part you mention is not regularly
stocked by Mouser and you will need to order 2000. Not sure if this is
what you wanted. If you really are in the market for 2000 chips then you
should be able to get samples from the manufacturer.

>
> I know I can get the Atmel chip at Digikey and some other places but I
> want to use a production part since this is for a prospective
> commercial device.

I would go with Digikey and get the Atmel part. They also have the
25256A which is faster (I think this might be important if you have new
BX-35s that are based on the Mega8535P). The Atmel parts from Digikey
are $1.20 which is also cheaper than Mouser non-Atmel part. If you are
in the market for manufacturing quantities than this makes a huge difference

BTW I'm a big fan of Mouser but they do not actively stock Atmel parts.
Mike



At 01:02 AM 8/13/2005 -0000, you wrote:

I wanted to use an Atmel 25256 EEPROM with a BasicX 35. Unfortunately
according to Mouser this chip has been discontinued (both voltage
variants).

<---It's only been discontinued in the DIP package. You can't use the SMD
version?

Ken

------
President and CTO - Arcom Communications
Makers of state-of-the-art repeater controllers and accessories.
http://www.ah6le.net/arcom/index.html
We offer complete Kenwood TKR repeater packages!
We are now an authorized Telewave Dealer!
AH6LE/R - IRLP Node 3000
http://www.irlp.net



Flyerx,

I just got off the Atmel web site and found only one version of the AT25256A
chip that is
not recommended for new designs. It was an older "automotive" version that
was superceded
by a newer version. The AT25256A-10PI-2.7 appears to still be an active
chip. DigiKey has
828 of the 1.8V-5.5V versions available now and will be shipping the
2.7V-5.5V chip early
next week. Hope this is helpful.

Chuck


Thanks for the replies.

Indeed the Atmel AT25256A is still active but not stocked by Mouser
and I wrongly assumed that it was the same discontinued part AT25256.
In fact the AT25256A is recomended for new designs according to
Atmel's site.

Just to be sure I will order samples from ST and Catalyst for testing.

regards,

FlyerX