Datenblatt-Suchmaschine für elektronische Bauteile |
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M27W512-150N6TR Datenblatt(PDF) 8 Page - STMicroelectronics |
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M27W512-150N6TR Datenblatt(HTML) 8 Page - STMicroelectronics |
8 / 21 page M27W512 8/21 quenced from the device outputs by toggling ad- dress line A0 from VIL to VIH. All other address lines must be held at VIL during Electronic Signa- ture mode. Byte 0 (A0 = VIL) represents the man- ufacturer code and byte 1 (A0 = VIH) the device identifier code. For the STMicroelectronics M27W512, these two identifier bytes are given in Table 3. and can be read-out on outputs Q7 to Q0. Note that the M27W512 and M27C512 have the same identifier byte. ERASURE OPERATION (APPLIES FOR UV EPROM) The erasure characteristics of the M27W512 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 M27W512 in about 3 years, while it would take ap- proximately 1 week to cause erasure when ex- posed to direct sunlight. If the M27W512 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 M27W512 window to prevent unintentional erasure. The recommend- ed erasure procedure for the M27W512 is expo- sure 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 dosage is approximately 15 to 20 minutes us- ing an ultraviolet lamp with 12000 µW/cm2 power rating. The M27W512 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. |
Ähnliche Teilenummer - M27W512-150N6TR |
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Ähnliche Beschreibung - M27W512-150N6TR |
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