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ST6255C 数据表(PDF) 13 Page - STMicroelectronics |
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ST6255C 数据表(HTML) 13 Page - STMicroelectronics |
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13 / 84 page  13/84 ST6255C ST6265C ST6265B PROGRAMMING MODES (Cont’d) 1.4.2 EPROM Erasing The EPROM of the windowed package of the MCUs may be erased by exposure to Ultra Violet light. The erasure characteristic of the MCUs is such that erasure begins when the memory is ex- posed to light with a wave lengths shorter than ap- proximately 4000Å. It should be noted that sunlight and some types of fluorescent lamps have wave- lengths in the range 3000-4000Å. It is thus recommended that the window of the MCUs packages be covered by an opaque label to prevent unintentional erasure problems when test- ing the application in such an environment. The recommended erasure procedure of the MCUs EPROM is the exposure to short wave ul- traviolet light which have a wave-length 2537A. The integrated dose (i.e. U.V. intensity x exposure time) for erasure should be a minimum of 15W- sec/cm2. The erasure time with this dosage is ap- proximately 15 to 20 minutes using an ultraviolet lamp with 12000µW/cm2 power rating. The ST62E65C should be placed within 2.5cm (1Inch) of the lamp tubes during erasure. |
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