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STMicro rolls out 256Mb, 128Mb memory devices

Posted: 19 Jul 2004 ?? ?Print Version ?Bookmark and Share

Keywords:stmicroelectronics? nand flash memory? nand256? nand128? nand128w3a?

According to a recently released press statement, STMicroelectronics has completed its 'Small Page' NAND Flash memory roadmap with the release of 256Mb and 128Mb devices designed for a range of consumer products that require large amounts of low cost memory such as mobile phones, PDAs and other portable equipment.

Available in 3V and 1.8V power supply versions, the NAND256 and NAND128 provide ultra-fast data throughput and erase capability, coupled with low power programming and low voltage operation. The devices have been developed using an advanced 120nm technology, and their small memory cell size ensures that the cost of mass memory is minimized.

The Address lines and Data Input/Output signals of all members of the family are multiplexed unto an 8-bit bus, reducing pin count and allowing the use of a modular NAND interface, which enables systems to be modified to use higher (or lower) density devices without changing the footprint, the company explained.

The memories are organized into 1024 (NAND128) or 2048 (NAND256) 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 without the need for external buffering, a feature that is typically used to move the data if a Page Program operation fails due to a defective block. A Block Erase command is provided, with a block erase time of 2ms. Each block is specified for 100,000 Program and Erase cycles, and 10-year data retention.

Device options include 'Automatic Page 0 Read after Power Up', and 'Chip Enable Don't Care', which simplifies the microcontroller interface and streamlines the use of NAND Flash in combination with other types of memory such as NOR Flash and SRAM. A device ID can be factory programmed, and a User Programmable Serial number supports increased security in the target application.

A software toolchain available from STMicro allows fast development of products that use the new memory chips, and can help to extend their useful life. Tools include Error Correction Code (ECC) software, Bad Block Management (BBM), Wear Leveling algorithms, File System OS Native reference software, and hardware simulation models.

The NAND128W3A and NAND256W3A (3V), and the NAND128R3A and NAND256R3A (1.8V), are available for sampling. They are housed in TSOP48 or VFBGA55 8-by-10mm ball array packages. Pricing for 100,000 units is $5.80 for the 256Mb product and $4.20 for the 128Mb device.

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