04-03-2020, 08:19 AM
This interesting tidbit shows how necessary the sticker over the window is:
Even though it would take the sun a week to erase the whole chip, one or two locations could be changed within hours.
Quote:The erasure characteristics of the M2732A are such that erasure begins when the cells are exposed to light with wavelengths shorter than approximately 4000 Å. It should be noted that sunlight and certain types of fluorescent lamps have wavelengths in the 3000-4000 Å range. Research shows that constant exposure to room level fluorescent lighting could erase a typical M2732A in approximately 3 years, while it would take approximately 1 week to cause erasure when exposed to the direct sunlight. If the M2732A is to be exposed to these types of lighting conditions for extended periods of time, it is suggested that opaque labels be put over the M2732A window to prevent unintentional erasure.
Even though it would take the sun a week to erase the whole chip, one or two locations could be changed within hours.