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M27512-25F1 데이터시트(PDF) 9 Page - STMicroelectronics |
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M27512-25F1 데이터시트(HTML) 9 Page - STMicroelectronics |
9 / 11 page Electronic Signature The Electronic Signature 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 corresponding programming algorithm. This mode is functional in the 25 °C ± 5 °C ambient temperature range that is required when program- ming the M27512. To activate this mode, the pro- gramming equipment must force 11.5V to 12.5V on address line A9 of the M27512. Two identifier bytes may then be sequenced from the device outputs by toggling address line A0 from VIL to VIH. All other address lines must be held at VIL during Electronic Signature mode, except for A14 and A15 which should be high. Byte 0 (A0 = VIL) represents the manufacturer code and byte 1 (A0 = VIH) the device identifier code. ERASURE OPERATION (applies to UV EPROM) The erasure characteristic of the M27512 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 M27512 in about 3 years, while it would take approximately 1 week to cause erasure when expose to direct sunlight. If the M27512 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 M27512 window to prevent unintentional erasure. The recommended erasure procedure for the M27512 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 ultraviolet lamp with 12000 µW/cm2 power rating. The M27512 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 re- moved before erasure. Speed and VCC Tolerance -2 200 ns, 5V ±5% blank 250 ns, 5V ±5% -3 300 ns, 5V ±5% -20 200 ns, 5V ±10% -25 250 ns, 5V ±10% Package F FDIP28W Temperature Range 1 0 to 70 °C 6 –40 to 85 °C Example: M27512 -2 F 1 ORDERING INFORMATION SCHEME For a list of available options (Speed, VCC Tolerance, Package, etc) refer to the current Memory Shortform catalogue. For fur ther inform ation o n any aspect of this device, please cont act STMicroelectronics Sales Office nearest to you. M27512 9/11 |
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유사한 설명 - M27512-25F1 |
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