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Winbond touts 'highest-density' Pseudo SRAM

Posted: 01 Nov 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Winbond? Pseudo SRAM? W968D6B? CRAM? CellularRAM?

Winbond Electronics has announced what it touts as the Pseudo SRAM with the largest density in the market. The W968D6B SRAM conforms to CellularRAM 1.5G standard and features a 256Mbit density (16M x 16), operating voltage and I/O voltage of 1.8V, and frequency up to 133MHz.

Rapid advances in mobile phone functionality, such as color photo browsing, JAVA game download and digital camera modules, have led to the need for more RAM buffer space in the handset memory. This increased demand in memory has made Pseudo SRAM an important part of the data cache. In recent years, it has completely replaced the traditional 6T SRAM in handsets. Pseudo SRAM's advantages include high capacity, low cost, high clock rates and lower power consumption. In many communication applications, the need today is for low-power memory that costs less but provides more capacity. In the future, Pseudo SRAM products will provide greater capacity and lower power consumption at even lower prices to meet this market demand, Winbond explained.

The Pseudo SRAM architecture is comprised of a DRAM macro core coupled with standard SRAM interface. DRAM macro core uses the traditional DRAM as its core where each memory cell is 1 Transistor + 1 Capacitor; the SRAM interface is designed specifically to be compatible with traditional SRAM. Pseudo SRAM includes an on-chip refresh circuit design that communicates with the outside world through the SRAM interface. This provides improved access speeds while minimizing design loading to take care refresh task. Pseudo SRAM is manufactured using existing DRAM processes including those down to 110nm and 90nm. This has greatly reduced the cost of manufacturing Pseudo SRAM. Winbond said the lower cost per Mb is now the main advantage of Pseudo SRAM.

There are currently three Pseudo SRAM standards in the market. Apart from the proprietary standard used by Samsung and the CSOMO standard used by Japan vendors, the most popular standard on the market is the CellularRAM Alliance's CRAM 1.0G/1.5G/2.0G standard. Winbond's Pseudo SRAM product line cover both COSMO and CRAM, ensuring that our products can meet any requirements. Winbond Electronics is currently a member of the CellularRAM Alliance.

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