erasing eprom

[LL205gti]

hi to all.

I need a technical information: in the forum I heard of eprom erasable electrically; and behold, I was wondering what the difference was between these and those erasable by uv rays.

how do I recognize them? that tool need for such cancellation "electric"?

thank you in advance if I want to clarify this doubt.

[Already]

The gate or by the programmer or by uv or not the gates just

[LL205gti]

by means of programmer that means? that the programmer uses, and what functions?

if you are not the gate for? I have to throw...or you can rewrite the above without deleting them first?

[elettro72]

if you are looking for with ****** it explains the difference.....the eprom, which is erased by uv rays, by now, not make more? those are now deleted by the programmer on purpose, however the difference you see why? those uv have a transparent window........

[LL205gti]

I'm sorry smentirti but I have bought recently, mindful erasable with uv, then do it!

rather I would like to know how to recognize those that can be canceled with the programmer, and how to do it...all the programmers have such a function?

[sno74]

As said elettro72 to erase the eprom with UV must have the window, what you've bought that have been clear you with UV....

[LL205gti]

yes, I know those erasable with uv, and are the ones that I bought, with the window.

while I do not know these can be canceled by the programmer: how do I recognize? they have some initials?

if they are without a window ? possible to mix them with those which are not rewritable...or am I wrong?

[elettro72]

on each integrated c? an acronym...and for each integrated c? its datasheet...

[LL205gti]

ok thanks for the advice elettro72. to be electrically-erasable (by the programmer) must be EEPROM, right?

[legendaryslave]

ok thanks for the advice elettro72. to be electrically-erasable (by the programmer) must be EEPROM, right?
but what kind of memory we speak

[LL205gti]

for example, I'm using for the pi? the 27c512. there are those erasable electrically?

[legendaryslave]

No some are not cancelable only those with the window can be erased with uv

[ugoboss]

that I know the eprom is erased only with the uv rays and have to force the window, electrically (with programmer) you clear of other types of memory, such as the e2prom and flash.

[LL205gti]

pu? be that there are such EEprom or flash type 27c512?

[ugoboss]

it seems to me, the 27c512 can be found in dip28 format or plcc32 but always eprom are.

[LL205gti]

therefore, either have the window (erasable by UV), or they are only writable once.

then I have been cheated by a seller who sold me one without the window, such as eprom; I have trusted in thinking that they were electrically erasable....let's say that I have made fool. also the price has definitely exaggerated, I gave a (without window) for 4.5 euros, while recently I have purchased from a German website (the ones with the window) to 3.40.

[carmageddon]

pu? be that there are such EEprom or flash type 27c512?

yes, 27SF512

I would add : the electric ones are ALL EEprom...but the habit of all ? not to make any distinctions...the Eprom are the ones with the window in the EEprom are all of the other

[LL205gti]

good news, thanks carmageddon. prover? to look on the web.
do you know what type of programmer you can delete? all programmers can do it, or you need a specific type?

[carmageddon]

all programmers support the eepronm like these, I use them always in the place of the 27CXXX on the old car where I have to use the emulator and do the tests several times

[LL205gti]

perfect. thank you very much.

will try? shops uk online who sell them. maybe from the site of the SST have the list of distributors for italy.
thanks again.

[maurof650]

Sorry, but reading the various discussions I did not understand if for example the 27C256 without inspection window can be erased electrically.

[carmageddon]

the eprom 27cxxx without window are OTP (one time programmable) and can only be programmed once, can not be deleted.
the eeprom (electrically erasable programmable read only memory) equivalent of the 27cxxx but erasable-programmable at will are the 27sfxxx

[maurof650]

I figured it out. You know the end programmers also the delete function?

[carmageddon]

yes, of course, everyone, even those prehistoric as the needhams emp20

[maurof650]

The good (and clear as ever.....thanks). Regarding the cancellation with UV (of the eprom window) I suppose that is sufficient for a normal lamp widely used for other uses; how many seconds of exposure are required for the cancellation of the rewritable eprom?

[carmageddon]

there are kits of uv lamps affixed to the little cost that should be fine, the time varies from 2 min 6-7 min

[booster]

I'm looking for the 27sf512 but not ? easy to find them in italy
in addition, it seems that we are in trade of fake chips
I am attaching the link with instructions on how to recognize them http://support.moates.net/fake-27sf512-chips/
I hope it can be useful

[LL205gti]

I had already seen this link. ? well let it be known to those who never knew him in this community.
it seems to me that many sellers are a bit too hasty to sell one thing for another; perhaps they think that there is no difference: I recently ? did you purchase from germany of the 27c512 that according to the description were TexasInstruments (supported by my programmer); when I arrived home, I found that instead they were of the ST and who, therefore, were not supported by my programmer. what a nice surprise.