Yenra : Hardware : DDR SDRAM : Super self refresh memory checks and corrects data with a reduced current that extends battery life for portable electronics


Elpida Memory has shipped samples of a 256 Megabit DDR SDRAM device that embeds Elpida's innovative Super Self Refresh (SSR) technology which achieves a dramatic 95% reduction in self refresh current (IDD6) to extend the battery life for portable consumer electronics applications with no trade off in performance. Other applications may include automobile infotainment systems and server storage systems. These systems require both high performance and high density DRAM for multimedia processing, as well as low current consumption to preserve battery life.

"Super Self Refresh technology is a fundamental advancement that will drive the expansion of DDR SDRAM into portable consumer electronics applications, because it enables a drastic change in scale for battery backup requirements," said Jun Kitano of Elpida. "By utilizing Elpida's DDR SDRAM with SSR technology, system designers can now decrease battery size, offer dramatically extended battery operation, or boost functionality without sacrificing performance."

SSR is a new circuit technology that dramatically extends the internal refresh interval by working with embedded Error Correction Circuit (ECC), which checks and corrects the data when exiting the self refresh cycle. The SSR function simply replaces the self refresh that is familiar in conventional SDRAMs. Utilizing an on-chip temperature sensor commonly known as Auto Temperature Compensated Self Refresh (ATCSR), SSR also automatically adjusts the self refresh timing to compensate for internal temperature variations. Devices with embedded SSR technology require only minuscule self refresh current: one twentieth of the current requirement compared with similar devices that do not include SSR technology.

Elpida Memory (now Micron) manufactures DRAM products.