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Datakey silicon inside

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  Datakey silicon inside John Speth <johnspeth@yahoo.com> - 2017-07-19 16:35 -0700
    Re: Datakey silicon inside Robert Wessel <robertwessel2@yahoo.com> - 2017-07-19 18:51 -0500
      Re: Datakey silicon inside John Speth <johnspeth@yahoo.com> - 2017-07-19 17:34 -0700
        Re: Datakey silicon inside Tim Wescott <seemywebsite@myfooter.really> - 2017-07-22 16:28 -0500
          Re: Datakey silicon inside John Speth <johnspeth@yahoo.com> - 2017-07-24 09:37 -0700
        Re: Datakey silicon inside Theo Markettos <theom+news@chiark.greenend.org.uk> - 2017-07-23 23:30 +0100
    Re: Datakey silicon inside John Speth <johnspeth@yahoo.com> - 2017-07-25 13:32 -0700

#27059 — Datakey silicon inside

Hi folks-

Does anybody know what memory devices are embedded in the Datakey memory 
tokens?

For example, this part:

http://datakey.com/downloads/SST_Series_DS_REVD.pdf

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

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#27060

On Wed, 19 Jul 2017 16:35:40 -0700, John Speth <johnspeth@yahoo.com>
wrote:

>Hi folks-
>
>Does anybody know what memory devices are embedded in the Datakey memory 
>tokens?
>
>For example, this part:
>
>http://datakey.com/downloads/SST_Series_DS_REVD.pdf
>
>which is from datakey.com.
>
>I'm pretty sure these devices are just embedded serial EEPROMs but 
>Datakey doesn't reveal the part inside.


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.

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#27061

On 7/19/2017 4:51 PM, Robert Wessel wrote:
> On Wed, 19 Jul 2017 16:35:40 -0700, John Speth <johnspeth@yahoo.com>
> wrote:
> 
>> Hi folks-
>>
>> Does anybody know what memory devices are embedded in the Datakey memory
>> tokens?
>>
>> For example, this part:
>>
>> http://datakey.com/downloads/SST_Series_DS_REVD.pdf
>>
>> which is from datakey.com.
>>
>> I'm pretty sure these devices are just embedded serial EEPROMs but
>> Datakey doesn't reveal the part inside.
> 
> 
> 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

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#27069

On Wed, 19 Jul 2017 17:34:43 -0700, John Speth wrote:

> On 7/19/2017 4:51 PM, Robert Wessel wrote:
>> On Wed, 19 Jul 2017 16:35:40 -0700, John Speth <johnspeth@yahoo.com>
>> wrote:
>> 
>>> Hi folks-
>>>
>>> Does anybody know what memory devices are embedded in the Datakey
>>> memory tokens?
>>>
>>> For example, this part:
>>>
>>> http://datakey.com/downloads/SST_Series_DS_REVD.pdf
>>>
>>> which is from datakey.com.
>>>
>>> I'm pretty sure these devices are just embedded serial EEPROMs but
>>> Datakey doesn't reveal the part inside.
>> 
>> 
>> 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

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#27072

On 7/22/2017 2:28 PM, Tim Wescott wrote:
> On Wed, 19 Jul 2017 17:34:43 -0700, John Speth wrote:
> 
>> On 7/19/2017 4:51 PM, Robert Wessel wrote:
>>> On Wed, 19 Jul 2017 16:35:40 -0700, John Speth <johnspeth@yahoo.com>
>>> wrote:
>>>
>>>> Hi folks-
>>>>
>>>> Does anybody know what memory devices are embedded in the Datakey
>>>> memory tokens?
>>>>
>>>> For example, this part:
>>>>
>>>> http://datakey.com/downloads/SST_Series_DS_REVD.pdf
>>>>
>>>> which is from datakey.com.
>>>>
>>>> I'm pretty sure these devices are just embedded serial EEPROMs but
>>>> Datakey doesn't reveal the part inside.
>>>
>>>
>>> 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?

It's like you're reading my mind, Tim.  It's a risk.

JJS

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#27070

John Speth <johnspeth@yahoo.com> wrote:
> 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.

http://datakey.com/uploads/site_images/datakey-hero-cutout.png

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

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#27073

On 7/19/2017 4:35 PM, John Speth wrote:
> Does anybody know what memory devices are embedded in the Datakey memory 
> tokens?
> 
> For example, this part:
> 
> http://datakey.com/downloads/SST_Series_DS_REVD.pdf
> 
> which is from datakey.com.
> 
> I'm pretty sure these devices are just embedded serial EEPROMs but 
> Datakey doesn't reveal the part inside.

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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