HYPERRAM™ Self-refresh DRAM ISSI HYPERRAM™ Self-Refresh DRAMs are high-speed CMOS with a HYPERBUS™ interface. The HYPERBUS is a low signal count, Double Data Rate (DDR) interface that allows high-speed read and write throughput. These devices are available in KGD/KTD and 24-pin BGA packages with 32Mb, 64Mb, 128Mb, and 256Mb densities. Other features include hidden refresh operation and low power consumption. These memory devices are ideal for mobile and automotive applications.