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M27C64A Datasheet(PDF) 8 Page - STMicroelectronics |
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M27C64A Datasheet(HTML) 8 Page - STMicroelectronics |
8 / 12 page tAVPL VALID AI00779 A0-A12 Q0-Q7 VPP VCC P G DATA IN DATA OUT E tQVPL tVPHPL tVCHPL tPHQX tPLPH tGLQV tQXGL tELPL tGHQZ tGHAX PROGRAM VERIFY Figure 6. Programming and Verify Modes AC Waveforms AI01167 n = 1 Last Addr VERIFY P = 1ms Pulse ++n > 25 ++ Addr VCC = 6V, VPP = 12.5V FAIL CHECK ALL BYTES 1st: VCC = 6V 2nd: VCC = 4.2V YES NO YES NO YES NO P = 3ms Pulse by n Figure 7. Programming Flowchart ERASURE OPERATION (applies to UV EPROM) The erasure characteristics of the M27C64A 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 wave- lengths in the 3000-4000 Å range. Research shows that constant exposure to room level fluo- rescent lighting could erase a typical M27C64A in about 3 years, while it would take approximately 1 week to cause erasure when exposed to direct sunlight. If the M27C64A 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 M27C64A window to prevent unintentional era- sure. The recommended erasure procedure for the M27C64A is exposure to short wave ultraviolet light which has a wavelength of 2537 Å. The inte- grated 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 M27C64Ashould 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. 8/12 M27C64A |
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