 |
Motore di ricerca datesheet componenti elettronici |
|
|
Motore di ricerca datesheet componenti elettronici |
|
FM18W08-SG Scheda tecnica(PDF) 5 Page - Ramtron International Corporation |
|
||||||||||||||||||||||||||||||
FM18W08-SG Scheda tecnica(HTML) 5 Page - Ramtron International Corporation |
|
|
5 / 11 page  FM18W08 Rev. 2.0 Dec. 2011 Page 5 of 11 A second design consideration relates to the level of VDD during operation. Battery-backed SRAMs are forced to monitor VDD in order to switch to battery backup. They typically block user access below a certain VDD level in order to prevent loading the battery with current demand from an active SRAM. The user can be abruptly cut off from access to the nonvolatile memory in a power down situation with no warning or indication. F-RAM memories do not need this system overhead. The memory will not block access at any VDD level that complies with the specified operating range. The user should take measures to prevent the processor from accessing memory when VDD is out-of- tolerance. The common design practice of holding a processor in reset during powerdown may be sufficient. It is recommended that Chip Enable is pulled high and allowed to track VDD during powerup and powerdown cycles. It is the user’s responsibility to ensure that chip enable is high to prevent accesses below VDD min. (2.7V). Figure 3 shows a pullup resistor on /CE which will keep the pin high during power cycles assuming the MCU/MPU pin tri-states during the reset condition. The pullup resistor value should be chosen to ensure the /CE pin tracks VDD yet a high enough value that the current drawn when /CE is low is not an issue. Figure 3. Use of Pullup Resistor on /CE CE WE OE A(14:0) DQ FM18W08 VDD MCU/ MPU R |
Codice articolo simile - FM18W08-SG |
|
Descrizione simile - FM18W08-SG |
|
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEETIT.COM |
| Lei ha avuto il aiuto da alldatasheet? [ DONATE ] |
Di alldatasheet | Richest di pubblicita | contatti | Privacy Policy | scambio Link | Ricerca produttore 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 |
Italian ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
