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M27C512-20C3 Fiches technique(PDF) 8 Page - STMicroelectronics |
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M27C512-20C3 Fiches technique(HTML) 8 Page - STMicroelectronics |
8 / 22 page M27C512 8/22 ERASURE OPERATION (APPLIES FOR UV EPROM) The erasure characteristics of the M27C512 is such that erasure begins when the cells are ex- posed to light with wavelengths shorter than ap- proximately 4000 Å. It should be noted that sunlight and some type 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 M27C512 in about 3 years, while it would take ap- proximately 1 week to cause erasure when ex- posed to direct sunlight. If the M27C512 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 M27C512 window to prevent unintentional erasure. The recommended erasure procedure for the M27C512 is exposure to short wave ultraviolet light which has wavelength 2537 Å. The integrated dose (i.e. UV intensity x exposure time) for erasure should be a minimum of 15 W-sec/cm2. The erasure time with this dos- age is approximately 15 to 20 minutes using an ul- traviolet lamp with 12000 µW/cm2 power rating. The M27C512 should be placed within 2.5 cm (1 inch) of the lamp tubes during the erasure. Some lamps have a filter on their tubes which should be removed before erasure. |
Numéro de pièce similaire - M27C512-20C3 |
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Description similaire - M27C512-20C3 |
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