Serial EERAM

EERAM is a serial SRAM product that has hidden nonvolatile bits. On any power disruption, the active SRAM array content is moved to the nonvolatile bits.  When power is restored, the nonvolatile content is restored to the SRAM array and SRAM operation continues.

EERAM offers unlimited writes to the SRAM array, allowing you to constantly write to the device. Since power loss events are typically random or unpredictable, EERAM works in applications that absolutely cannot lose the quickly changing SRAM data on any sudden power loss. It provides designers of data logging/black box or monitoring systems with a safe and accurate way to safely, reliably and automatically store the last data bytes prior to the power loss event. The capacitor connected to the VCAP pin provides the necessary energy to safely copy the RAM’s contents to the secure nonvolatile backup on power loss. Upon power-up, data is recalled automatically from the nonvolatile cells to the SRAM.