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ST unveils VFBGA55 version of Small Page NAND Flash memory chip

Posted: 09 Dec 2004 ?? ?Print Version ?Bookmark and Share


STMicroelectronics (ST) announced volume production of the VFBGA55 version of its 256Mb 'Small Page' NAND flash memory chip.

The press release said that the availability of the device in its 8-by-10mm BGA package will allow manufacturers to use a significant amount of memory in portable equipment such as camera phones and smart phones, low cost digital cameras, PDAs and USB camera sticks, and in other products where board space is limited. The 1mm thick package maintains ball-out compatibility with other NAND products, but will save around 20 percent of board space in typical applications, added ST.

The NAND256 is part of the company's NAND flash portfolio, which includes 128Mb, 256Mb, 512Mb and 1Gb devices, operating on either 1.8V or 3V power supplies. It provides ultra-fast data throughput and erase capability, coupled with the low power programming and low voltage operation. In addition, it has been developed using an advanced 120nm technology and the small memory cell size ensures that cost is minimized for price-sensitive products.

The memory is organized into 2,048 nominal 16KB blocks, each of which is divided into pages of 512-bytes, plus 16 spare bytes per page, that can be read and programmed by page. The spare bytes are typically used for Error Correction Codes, software flags or Bad Block identification. A Copy Back Program mode enables data stored in one page to be programmed directly into another, a feature that is typically used to move data from a defective block; and a Block Erase command achieves an erase time of 2ms.

ST's software toolchain allows fast development of products that use any of the devices in the NAND flash family, and can help to extend their useful life. Tools include Error Correction Code (ECC) software, Bad Block Management (BBM), Wear Leveling algorithms to optimize the ageing of the device, File System OS Native reference software, and hardware simulation models.

The NAND256W3A (3V) and the NAND256R3A (1.8V) are available in the VFBGA55 8-by-10mm ball array package (ZA), priced at $6.50 for 100,000 units.

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