Electronic Components Datasheet Search |
|
M27W201-150K6TR Datasheet(PDF) 11 Page - STMicroelectronics |
|
M27W201-150K6TR Datasheet(HTML) 11 Page - STMicroelectronics |
11 / 24 page M27W201 Device Description 11/24 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°C ± 5°C ambient temperature range that is required when programming the M27W201. To activate the ES mode, the programming equipment must force 11.5V to 12.5V on address line A9 of the M27W201 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) repres ents the manufacturer code and byte 1 (A0 = VIH) the device identifier code. For the STMicroelectronics M27W201, these two identifier bytes are given in Table 3 and can be read-out on outputs Q7 to Q0. Note that the M27W201 and M27C2001 have the same identifier byte. 2.10 Erasure operation (applies to UV EPROM) The erasure characteristics of the M27W201 are 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. Data shows that constant exposure to room level fluorescent lighting could erase a typical M27W201 in about 3 years, while it would take approximately 1 week to cause erasure when exposed to direct sunlight. If the M27W201 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 M27W201 window to prevent unintentional erasure. The recommended erasure procedure for the M27W201 is exposure to short wave ultraviolet light which has wavelength of 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 M27W201 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 removed before erasure. Table 3. Electronic Signature Identifier A0 Q7 Q6 Q5 Q4 Q3 Q2 Q1 Q0 Hex Data Manufacturer’s Code VIL 0 0 1 000 00 20h Device Code VIH 0 1 1 000 01 61h |
Similar Part No. - M27W201-150K6TR |
|
Similar Description - M27W201-150K6TR |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |