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M27C4001-15XB1 Datasheet(PDF) 11 Page - STMicroelectronics |
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M27C4001-15XB1 Datasheet(HTML) 11 Page - STMicroelectronics |
11 / 24 page M27C4001 Device operation 11/25 2.10 Erasure operation (applies to UV EPROM) The erasure characteristics of the M27C4001 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 some type of fluorescent lamps have wavelengths in the 3000-4000 Å range. Data shows that constant exposure to room level fluorescent lighting could erase a typical M27C4001 in about 3 years, while it would take approximately 1 week to cause erasure when exposed to direct sunlight. If the M27C4001 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 M27C4001 window to prevent unintentional erasure. The recommended erasure procedure for the M27C4001 is exposure to short wave ultraviolet light which has 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 M27C4001 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 2. Operating Modes(1) 1. X = VIH or VIL, VID = 12V ± 0.5V. Mode E G A9 Vpp Q7 - Q0 Read VIL VIL XVCC or VSS Data Out Output Disable VIL VIH XVCC or VSS Hi-Z Program VIL Pulse VIH XVPP Data In Verify VIH VIL XVPP Data Out Program Inhibit VIH VIH XVPP Hi-Z Standby VIH XX VCC or VSS Hi-Z Electronic Signature VIL VIL VID VCC Codes Table 3. Electronic Signature Identifier A0 Q7 Q6 Q5 Q4 Q3 Q2 Q1 Q0 Hex Data Manufacturer’s Code VIL 0 010 00 00 20h Electronic Signature VIH 0 100 00 01 41h |
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