[Coco] Has anyone seen these? Any info?

[Salvador Garcia]

 "... using the Winbond W27C512 (64KB) EERPROM,"

Then the seller's statement is wrong? (The extra "R" not withstanding.)

And this datasheet also says it is an EEPROM:

http://pdf.datasheetcatalog.com/datasheet/WinbondElectronics/mXrtxsu.pdf

He references the EPROM when he brings up the OTP:

"Do NOT buy EPROMs (single 'E', as they can only programmed ONCE and are old!"

I see that some manufacturers do use the OTP EPROM nomenclature (Microchip). I guess it doesn't make sense to me, since once the OTP is programmed, that's it. It can't be erased, at least not by the conventional UV lamp method. If anything, I see OTP ROMs falling in the PROM group.

I am just trying to understand the description and determine whether this is a legitimate product, given the inconsistencies that we've seen in said description.

Thanks, Salvador





On Tuesday, July 9, 2019, 01:35:02 PM CDT, wrcooke at wrcooke.net <wrcooke at wrcooke.net> wrote:
 
 <snipped>
  The 27c512 is an EPROM, not EEPROM.  It is, when the package has a
  quartz window, erasable.  However, they make OTP (one time programmable
  ) versions which can't be erased so are effectively not
  reprogrammable.  The quartz window is expensive.  That is a
  cost-cutting measure.

  Will

<snipped>