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M27V102-90N1TR Datasheet(PDF) 9 Page - STMicroelectronics |
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M27V102-90N1TR Datasheet(HTML) 9 Page - STMicroelectronics |
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9 / 15 page  and G at VIL, P at VIH,VPP at 12.75V and VCC at 6.25V. On-Board Programming The M27V102 can be directly programmed in the application circuit. See the relevant Application Note AN620. Electronic Signature The Electronic Signature (ES) mode allows the reading out of a binary code from an EPROM that will identify its manufacturer and type. This mode is intended for use by programming equipment to automatically match the device to be programmed with its correspondingprogramming algorithm. The ES mode is functional in the 25 °C ± 5°C ambient temperature range that is required when program- ming the M27V102. To activate the ES mode, the programming equipmentmust force 11.5Vto 12.5V on address line A9 of the M27V102 with VPP =VCC = 5V. Two identifier bytes may then be sequenced from the device outputs by togglingaddress line A0 from VIL to VIH. All other address lines must be held at VIL during Electronic Signature mode. Byte 0 (A0=VIL) represents the manufacturer code and byte 1 (A0=VIH) the device identifier code. For the STMicroelectronics M27V102, these two iden-tifier bytes are given in Table 4 and can be read-out on outputs Q0 to Q7. Note that the M27V102 and M27C1024 have the same identifier bytes. ERASURE OPERATION (applies to UV EPROM) The erasure characteristics of the M27V102is 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 M27V102 in about 3 years, while it would take approximately 1 week to cause erasure when exposed to direct sunlight. If the M27V102 is to be exposed to these types of lighting condi- tions for extended periods of time, it is suggested that opaque labels be put over the M27V102 win- dow to prevent unintentional erasure. The recom- mended erasure procedure for the M27V102 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 dosage is approximately 15 to 20 minutes using an ultravioletlamp with 12000 µW/cm2 power rating. The M27V102 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. 9/15 M27V102 |
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