Difference 23512 and 27512 Eprom

From: Dwight K. Elvey <dwight.elvey_at_amd.com>
Date: Fri Oct 22 12:15:29 2004

>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.
Dwight
Received on Fri Oct 22 2004 - 12:15:29 BST