Toshiba Corp developed what it claims is the world's first 64-Gbit NAND flash memory chip manufactured by using 19nm process technology.
Toshiba will start sample shipment in late April 2011 and volume production in the third quarter of 2011 (July to September 2011). The newly-developed 64-Gbit NAND flash memory chip is a 2-bit/cell product, but the company intends to commercialize 3-bit/cell and 1-bit/cell products, too. However, it has not yet decided when to commercialize them.
Because of the recent rapid growth of the smartphone market, the emergence of tablet PCs and the wider use of SSDs, larger capacities and higher speeds are now required for NAND flash memories. To meet such demands, Toshiba commercialized the 64-Gbit NAND flash memory chip by combining the 19nm process technology and 2-bit/cell technology.
The company reduced chip area by replacing 24nm process technology with the 19nm process technology so that 16 chips can be stacked in a small package embedded in a smartphone or a tablet PC (See related article). As for the demand for higher speeds, it employed the "Toggle DDR 2.0" interface standard, which enables to transfer data at a speed of up to 400Mbps.