Hi folks-
Does anybody know what memory devices are embedded in the Datakey memory tokens?
For example, this part:
which is from datakey.com.
I'm pretty sure these devices are just embedded serial EEPROMs but Datakey doesn't reveal the part inside.
Thanks - John
They say it's an SPI EEPROM, and the interface exposes the usual set of signals. Why wouldn't you believe them? I mean it's possible they have some sort of SPI interface device and some other sort of ROM behind that, but if they do, it'll still look like an SPI EEPROM to you.
I want to replicate the token in a new circuit design that embeds a token within. I need to know the exact EEPROM part number so I don't have to embed the whole datakey token. My plan has size and cost advantages.
You could be right about extra chips inside but the data sheets don't give any hints about any additional chips. The interface specs are suspiciously similar to the famous 25LC320A EEPROM but there are enough differences that excludes the 25LC320A.
John
Is the 25LC320A customizable? Could they be buyin' and bashin'?
Alternately (and horribly, from your point of view), could they have enough business that they buy semi-custom parts?
-- Tim Wescott Wescott Design Services http://www.wescottdesign.com
looks rather like it's a standard SOIC-8 part on a PCB. It could be 'artist's concept' or CGI or something, but it seems like there's nothing smart inside. I rather doubt they would be fabbing their own EEPROM chips - they don't advertise anything special about them beyond the plastic case.
Theo
It's like you're reading my mind, Tim. It's a risk.
JJS
I have information from a trusted source that the part inside is a single off-the-shelf Atmel AT25256B SPI EEPROM.
JJS
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