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M27V322-150XF6 Datenblatt(PDF) 10 Page - STMicroelectronics |
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M27V322-150XF6 Datenblatt(HTML) 10 Page - STMicroelectronics |
10 / 23 page Device operation M27V322 10/23 2.10 Electronic Signature The Electronic Signature (ES) 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. The ES mode is functional in the 25°C ± 5°C ambient temperature range that is required when programming the M27V322. To activate the ES mode, the programming equipment must force 11.5V to 12.5V on address line A9 of the M27V322, with VPP = VCC = 5V. 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. Byte 0 (A0 = VIL) represents the manufacturer code and byte 1 (A0 = VIH) the device identifier code. For the STMicroelectronics M27V322, these two identifier bytes are given in Table 3 and can be read-out on outputs Q0 to Q7. 2.11 Erasure operation (applies to UV EPROM) The erasure characteristics of the M27V322 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 M27V322 in about 3 years, while it would take approximately 1 week to cause erasure when exposed to direct sunlight. If the M27V322 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 M27V322 window to prevent unintentional erasure. The recommended erasure procedure for M27V322 is exposure to short wave ultraviolet light which has a wavelength of 2537 Å. The integrated dose (i.e. UV intensity x exposure time) for erasure should be a minimum of 30 W-sec/cm2. The erasure time with this dosage is approximately 30 to 40 minutes using an ultraviolet lamp with 12000 µW/cm2 power rating. The M27V322 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 removed before erasure. Table 2. Operating modes(1) 1. X = VIH or VIL, VID = 12V ± 0.5V. Mode E GVPP A9 Q15-Q0 Read VIL VIL X Data Out Output Disable VIL VIH X Hi-Z Program VIL Pulse VPP X Data In Program Inhibit VIH VPP X Hi-Z Standby VIH X X Hi-Z Electronic Signature VIL VIL VID Codes Table 3. Electronic signature(1) 1. Outputs Q15-Q8 are set to '0'. Identifier A0 Q7 Q6 Q5 Q4 Q3 Q2 Q1 Q0 Hex Data Manufacturer’s Code VIL 00100000 20h Device Code VIH 00110100 34h |
Ähnliche Teilenummer - M27V322-150XF6 |
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Ähnliche Beschreibung - M27V322-150XF6 |
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