Electronic Components Datasheet Search |
|
M27C64A-25F1TR Datasheet(PDF) 8 Page - STMicroelectronics |
|
M27C64A-25F1TR Datasheet(HTML) 8 Page - STMicroelectronics |
8 / 11 page at 12.5V, will program that M27C64A. A high level E input inhibits the other M27C64A from being programmed. Program Verify A verify (read) should be performed on the pro- grammed bits to determine that they were correctly programmed. The verify is accomplished with E and G at VIL, P at VIH,VPP at 12.5V and VCC at 6V. 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 M27C64A. To activate this mode, the programming equipmentmust force 11.5V to 12.5V on address line A9 of the M27C64A, 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 Signa- ture mode. Byte 0 (A0=VIL) represents the manufacturer code and byte 1 (A0=VIH) the device identifier code. For the SGS-THOMSON M27C64A, these two identi- fier bytes are given in Table 4 and can be read-out on outputs Q0 to Q7. ERASURE OPERATION (applies to UV EPROM) The erasure characteristics of the M27C64A is such that erasure begins when the cells are ex- posed to light with wavelengths shorter than ap- proximately 4000 Å. It should be noted that sunlight and some type of fluorescent lamps have wave- lengths in the 3000-4000 Å range. Research shows that constant exposure to room level fluo- rescent lighting could erase a typical M27C64A in about 3 years, while it would take approximately 1 week to cause erasure when exposed to direct sunlight. If the M27C64A 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 M27C64Awindow to prevent unintentional era- sure. The recommended erasure procedure for the M27C64A is exposure to short wave ultraviolet light which has a wavelength of 2537 Å. The inte- grated 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 uW/cm2 power rating. The M27C64A should be placed within 2.5 cm (1 inch) of the lamp tubes during the erasure. Some lamps have a filter on their tubeswhich should be removed beforeerasure. DEVICE OPERATIONS (cont’d) Speed -15 150 ns -20 200 ns -25 250 ns -30 300 ns Package F FDIP28W C PLCC32 Temperature Range 1 0 to 70 °C 6 –40 to 85 °C Option X Additional Burn-in TR Tape & Reel Packing Example: M27C64A -15 F 1 TR ORDERING INFORMATION SCHEME For a list of available options (Speed, 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. 8/11 M27C64A |
Similar Part No. - M27C64A-25F1TR |
|
Similar Description - M27C64A-25F1TR |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | 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 |