Difference 23512 and 27512 Eprom

From: Dwight K. Elvey <dwight.elvey_at_amd.com>
Date: Fri Oct 22 16:09:28 2004

 I guess the next thing is to find a pinout for
the 23512 to see if they have a select that is inverted
that might need to be patched around to read on
a standard programmer.

>From: birs23_at_zeelandnet.nl
>Dwight, not missing the discussion ;-)
>At 19:15 22-10-2004, you wrote:
>> >From: ard_at_p850ug1.demon.co.uk
>> >
>> >>
>> >> Hi,
>> >>
>> >> I know very little about electronics and eproms so this question might be
>> >> really easy. I would like to know what the difference is between a 23512
>> >> eprom and a 27512 and if there are any differences if its possible to
>> make
>> >
>> >I thought the 23512 was the mask-programmed part (not an EPROM), and is
>> >otherwise the same device. You should be able to read it (unless your
>> >programmer tries to be clever and read the manufacturer's ID word, etc).
>> >
>> >-tony
>> >
>>Hi Tony
>> I think you are right about the 23xxx being mask versions.
>>The problem with the newer EPROM parts is that they do not
>>require pulsing of the programming voltage. Many programmers
>>simply leave the programming voltage high while reading or
>>verifying. This is real bad for mask parts. Also, most mask
>>parts use the programming voltage pin as another select.
>>This means that it may need to be in the opposite state that,
>>even a programmer that allows setting of the program voltage,
>>may not be in the right state to read.
>> Also, I think this fellow is off the list and doesn't realize
>>that he is talking to a list. I suspect he is missing our
>>conversations related to his issue.
Received on Fri Oct 22 2004 - 16:09:28 BST

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