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Winbond Electronics has announced an expansion of its flash product portfolio with the introduction of a family of stackable SpiFlash memory devices. The new SpiStack W25M Series is Winbond's first to allow the "stacking" of homogeneous or heterogeneous flash, thus achieving memories of varying densities for code and/or data storage, while providing designers with the flash solutions most appropriate for their design requirements.

The Winbond SpiStack W25M series provides a wide range of densities in the well-established 8-pin package to which designers are accustomed. Additionally, W25M memories feature the popular, multi-IO SpiFlash interface and command set.

SpiStack homogeneous memories are achieved by stacking SpiFlash dies. For example, two 256Mb dies combining to form a single SpiFlash 512Mb NOR memory in the industry-standard 8-pin 8x6mm WSON package. Winbond's stacked product, W25M512JV, is also available in the widely used 16-pin SOIC or 24-pad BGA packages and is sampling now. SpiStack heterogeneous memories call for the stacking of a NOR memory with a NAND die, such as a 64Mb SpiFlash NOR blended with a 1Gb Serial NAND die, which gives designers the flexibility to store code in the NOR die and data in the NAND memory.

Winbond's SpiFlash memory devices are manufactured at the company's 12-inch wafer fabrication facility in Taichung, Taiwan.