The QDR Consortium, which includes Cypress Semiconductor Corp. and Renesas Electronics Corporation, today claimed the industry’s fastest quad data rate (QDR) SRAMs (static random access memory). The new memory devices, which will begin sampling in mid 2011, will be named QDRII+ Xtreme and will operate at clock speeds up to 633 megahertz (MHz). The companies report that they will be fit-, form- and function-compatible with existing QDR II+ devices. Target applications include network switches, routers, and aggregation platforms.
The new QDR II+ Xtreme SRAMs will be offered with either x18 or x36 word widths, and with bursts of 4 or 2 access. The burst of 4 devices delivers a random transaction rate (RTR) of 633 million random transactions per second, operating at clock speeds of 633 MHz, the highest available for a QDR SRAM. The burst of 2 offerings operate at a frequency of 450 MHz and offer an RTR of 900 million random transactions per second, which doubles the RTR of the prior generation burst of 4 devices running at the same frequency. (Random transaction rate is defined as the number of fully random memory accesses per second and is the critical memory metric enabling increased line/switching rates. )
First engineering samples of the 36 megabit (Mb) and 72Mb QDR II+ Xtreme devices from Cypress are expected for lead customers in mid-2011.
QDR Consortium website