I want to replace some eproms with the code tmm275120-25 do I need to get the same ones or are other compatible? This is for a road blasters PCB with corrupted eproms if that matters.
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Just make sure the # after the dash is the same or lower (-25, -20, -17, -15, etc....)
You can also use 27C512 EPROMs too...
If an eprom won't erase does that mean its bad?
Maybe.
Look up the data sheet for it at http://www.datasheetarchive.com and see what the speed values are for a version of chip that doesn't have it labeled.
RJ
Justing putting in my two cents, the -25 and the -20 are the speed at which the EPROM can read the data, so you always want something that is the same OR faster. Just wanted to point that out to anyone else looking at this thread.
Yeah I usually use Goo Gone to clean the window on my EPROMs when I can't get them erase completely. Use a little bit of goo gone and then a bit of windex and I'm good to go. I have had some old EPROMs that just go bad, but I think I've only encountered 2 or 3 out of all the ones I have ever tried programming.
The number is the access time in nanoseconds. The lower the number, the fewer nanoseconds it takes to read the data, and thus the faster it is.So is the lower the number the faster it reads ? Funny thing to me at least,
I tried to erase it now it comes up with an error saying it does not recognize the chip under that description, so I think that chip is done?
The number is the access time in nanoseconds. The lower the number, the fewer nanoseconds it takes to read the data, and thus the faster it is.
What do you mean by this? Does it give you this error when you try to program the chip, or does it give you this error when you try to blank check it? Are you sure you have the correct chip selected in the programmer software? Can you program the chip full of 00's?
-Ian