I. Introduction
Today, the memory market has changed from Synchronous Dynamic Random Access Memories (SDRAMs) to Synchronous high-speed Double Data Rate (DDR) with transfer rates of up to 800 Mb/sec/pin (DDR-II). Many solid state recorders on board satellite systems use SDRAMs as their memory element. However, obsolescence of this family necessitates searching for alternative memory types. Here, candidate memory types are DDR/DDR-II/DDR-III and FLASH devices subject to acceptable total ionizing dose (TID) and SEE radiation performances [2].