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M27C2001-10N1TR Datasheet(PDF) 10 Page - STMicroelectronics |
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M27C2001-10N1TR Datasheet(HTML) 10 Page - STMicroelectronics |
10 / 25 page M27C2001 Device operation 10/25 2.7 Program Inhibit Programming of multiple M27C2001s in parallel with different data is also easily accomplished. Except for E, all like inputs including G of the parallel M27C2001 may be common. A TTL low level pulse applied to a M27C2001's P input, with E low and VPP at 12.75V, will program that M27C2001. A high level E input inhibits the other M27C2001s from being programmed. 2.8 Program Verify A verify (read) should be performed on the programmed bits to determine that they were correctly programmed. The verify is accomplished with E and G at VIL, P at VIH, VPP at 12.75V and VCC at 6.25V. 2.9 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 ± 5°C ambient temperature range that is required when programming the M27C2001. To activate the ES mode, the programming equipment must force 11.5 to 12.5V on address line A9 of the M27C2001 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 M27C2001, these two identifier bytes are given in Table 3 and can be read-out on outputs Q7 to Q0. 2.10 Erasure operation (applies to UV EPROM) The erasure characteristics of the M27C2001 are such that erasure begins when the cells are exposed to light with wavelengths shorter than approximately 4000Å. It should be noted that sunlight and some type of fluorescent lamps have wavelengths in the 3000-4000Å range. Data shows that constant exposure to room level fluorescent lighting could erase a typical M27C2001 in about 3 years, while it would take approximately 1 week to cause erasure when exposed to direct sunlight. If the M27C2001 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 M27C2001 window to prevent unintentional erasure. The recommended erasure procedure for the M27C2001 is exposure to short wave ultraviolet light which has wavelength of 2537Å. The integrated dose (i.e. UV intensity x exposure time) for erasure should be a minimum of 15W-s/cm2. The erasure time with this dosage is approximately 15 to 20 minutes using an ultraviolet lamp with 12000µW/cm2 power rating. The M27C2001 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. |
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