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Terry Yager
November 13th, 2005, 09:28 AM
Does anybody here know the programming voltage of a M27256-2FI EPROM (made by SGS-Thompson), or where to find the datasheet? The only sheet that comes up in an extensive web search is for a (generic) 27256 (no suffix). Are the programming voltages the same on these two chips? (I do know that a 27256 uses a different voltage than a 27256-A). Any help?

--T

Donni
November 14th, 2005, 04:24 AM
If I don't know the programming voltage of a eprom i want to burn, if first try 12,5V.
If that doesn't work I try 21V, and if that doesn't work i throw it away :huh:

Terry Yager
November 14th, 2005, 06:24 AM
If I don't know the programming voltage of a eprom i want to burn, if first try 12,5V.
If that doesn't work I try 21V, and if that doesn't work i throw it away :huh:

Yeah, I thought I might try the ol' trial-and-error if I have to. I've got a whole tube of 'em, so I can afford to sacrifice a couple to experimentation, if necessary.

--T

runni
November 14th, 2005, 07:26 AM
Hi,

PGM voltage is 12,5V .

R.N.

machine
November 16th, 2005, 03:57 AM
Old data is hard to get on the big variety of the old EPROMS. But if you have a good programmer like DATA I\O then it's easy to just look up the EPROM type and set the programmer to copy or program. The programmer takes care of the detail.

KeepGood
April 20th, 2006, 02:41 PM
Hi mate.

I'm not sure about the 2FI model but most M27C256 chips by SGS-T were NMOS eproms with a 5v supply voltage and 12.5/12.75 programming voltage.

Be careful if you are using a willem programmer though. A mod is required to program NMOS eprom or it will toast your progger. :)

For datasheets, check www.datasheetarchive.com.