поискавой системы для электроныых деталей |
|
M27C64A-20C1X датащи(PDF) 4 Page - STMicroelectronics |
|
M27C64A-20C1X датащи(HTML) 4 Page - STMicroelectronics |
4 / 12 page Programming When delivered (and after each erasure for UV EPROM), all bits of the M27C64A are in the "1" state. Data is introduced by selectively program- ming "0"s into the desired bit locations. Although only "0"s will be programmed, both "1"s and "0"s can be present in the data word. The only way to change a "0" to a "1" is by die exposition to ultra- violet light (UV EPROM). The M27C64A is in the programming mode when Vpp input is at 12.5V, E is at VIL and P is pulsed to VIL. The data to be programmed is applied to 8 bits in parallel to the data output pins. The levels required for the ad- dress and data inputs are TTL. VCC is specified to be 6V ± 0.25V. High Speed Programming The high speed programming algorithm, described in the flowchart, rapidly programs the M27C64A using an efficient and reliable method, particularly suited to the production programming environ- ment. An individual device will take around 1 minute to program. Program Inhibit Programming of multiple M27C64A in parallel with different data is also easily accomplished. Except for E, all like inputs including G of the parallel M27C64A may be common. A TTL low level pulse applied to a M27C64A P input, with E low and VPP 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 (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 program- ming the M27C64A. To activate the ES mode, the programming equipment must 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 STMicroelectronics M27C64A, these two iden- tifier bytes are given in Table 4 and can be read-out on outputs Q0 to Q7. 4/12 M27C64A |
Аналогичный номер детали - M27C64A-20C1X |
|
Аналогичное описание - M27C64A-20C1X |
|
|
ссылки URL |
Конфиденциальность |
ALLDATASHEETRU.COM |
Вашему бизинису помогли Аллдатащит? [ DONATE ] |
Что такое Аллдатащит | реклама | контакт | Конфиденциальность | обмен ссыками | поиск по производителю 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 |