Mobile LPDDR2 SDRAM ISSI Mobile LPDDR2 SDRAMs achieve high-speed operation using a double data rate architecture. The Mobile LPDDR2 SDRAM double data rate architecture is a pre-fetch architecture with an interface designed to transfer two data words per clock cycle at the I/O pins. The ISSI Mobile LPDDR2 data paths are internally pipelined and 4n bits pre-fetched to achieve very high bandwidth.