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M27W101-100N6TR Datasheet(PDF) 11 Page - STMicroelectronics |
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M27W101-100N6TR Datasheet(HTML) 11 Page - STMicroelectronics |
11 / 23 page M27W101 Device description 11/23 Byte 0 (A0 = VIL) represents the manufacturer code and byte 1 (A0 = VIH) the device identifier code. For the STMicroelectronics M27W101, these two identifier bytes are given in Table Table 3 and can be read-out on outputs Q7 to Q0. Note that the M27W101 and M27C1001 have the same identifier byte. 2.10 Erasure operation (applies to UV EPROM) The erasure characteristics of the M27W101 is 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 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 M27W101 in about 3 years, while it would take approximately 1 week to cause erasure when exposed to direct sunlight. If the M27W101 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 M27W101 window to prevent unintentional erasure. The recommended erasure procedure for the M27W101 is exposure to short wave ultraviolet light which has a wavelength of 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 using an ultraviolet lamp with 12000 µW/cm2 power rating. The M27W101 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. Table 3. Electronic Signature Identifier A0 Q7 Q6 Q5 Q4 Q3 Q2 Q1 Q0 Hex Data Manufacturer’s Code VIL 00100 000 20h Device Code VIH 00000 101 05h |
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