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FM18W08 データシート(PDF) 5 Page - Ramtron International Corporation |
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FM18W08 データシート(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 |
同様の部品番号 - FM18W08 |
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同様の説明 - FM18W08 |
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