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M27128A-2F6 Datasheet(PDF) 8 Page - STMicroelectronics |
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M27128A-2F6 Datasheet(HTML) 8 Page - STMicroelectronics |
8 / 10 page Program Verify A verify should be performed on the programmed bits to determine that they were correctly pro- grammed. The verify is accomplished with G = VIL, E = VIL, P = VIH and VPP at 12.5V. 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 the25 °C ± 5°C ambient temperature range that is required when program- ming the M27128A. To activate this mode, the programming equipment must force 11.5V to 12.5V on address line A9 of the M27128A. Two identifier bytes may then be se- quenced from the device outputs by toggling ad- dress 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 manufac- turer code and byte 1 (A0 = VIH) the device identifier code. For the SGS-THOMSON M27128A, these two identifier bytes are given below. ERASURE OPERATION (applies to UV EPROM) The erasure characteristic of the M27128A 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 M27128A in about 3 years, while it would take approximately 1 week to cause erasure when exposed to direct sunlight. If the M27128A 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 M27128A window to prevent unintentional erasure. The recommended erasure procedure for the M27128A 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 ultra- violet lamp with 12000 µW/cm2 power rating. The M27128A should be placed within 2.5cm (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% -4 450 ns, 5V ± 5% -20 200 ns, 5V ± 10% -25 250 ns, 5V ± 10% -30 300 ns, 5V ± 10% Package F FDIP28W Temperature Range 1 0 to 70 °C 6 –40 to 85 °C Example: M27128A -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 further information on any aspect of this device, please contact SGS-THOMSON Sales Office nearest to you. 8/10 M27128A |
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