Difference 23512 and 27512 Eprom

From: birs23_at_zeelandnet.nl <(birs23_at_zeelandnet.nl)>
Date: Fri Oct 22 15:33:47 2004

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.
>Dwight
Received on Fri Oct 22 2004 - 15:33:47 BST