Product category:
Memory Devices and Modules
News Release from: Gleichmann-Sunrise | Subject: QDR II and DDR II SRAMs
Edited by the Electronicstalk Editorial
Team on 02 September 2002
Second-generation DDR and QDR SRAMs
available now
Available now from Sunrise Electronics are NEC's QDR II quad datarate and DDR II double datarate families of SRAM products.
Available now from Sunrise Electronics are NEC's QDR II quad datarate and DDR II double datarate families of SRAM products These products are fully compliant with the second-generation of high-performance QDR and DDR communication memory standards for network switches, routers and other communications applications
This article was originally published on Electronicstalk on 20 Feb 2001 at 8.00am (UK)
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The first of NEC's QDR II/DDR II products is available in an 18Mbit configuration, with a 36Mbit version scheduled for future availability.
Additionally, NEC's QDR II/DDR II family of SRAM products is available with input/output (I/O) configurations that support either a burst length of two or a burst length of four.
NEC's 18Mbit QDR II SRAM devices use the QDR II-standard 165-pin, 13 x 15mm fine-pitch, ball-grid array (FBGA) packaging, providing significant space savings and shorter bus lengths for minimised delays, skews and electromagnetic interference (EMI).
The products also feature a low 1.8V power source to accommodate the stringent power specifications characteristic of high-end routers and switches.
The devices also provide an unprecedented data-valid window of 65% of the clock cycle or a 1.3ns data-valid window at 250MHz.
QDR II and DDR II SRAMs enable system designers to maximise bandwidth in data-intensive communication applications by allowing operation speeds up to 333MHz.
The QDR II architecture features two data ports (input and output) operating twice per clock cycle to deliver a total of four data instructions per cycle.
The resulting performance increase is particularly valuable for high-end communications applications, where the fast movement of large amounts of data is essential.
Single I/O DDR II devices allow double datarate transfers over the I/O databus and are optimised for data-streaming operations.
The QDR II/DDR II SRAM specification is popular with many network processor vendors, and several network processors are now available with QDR II interfaces.
The QDR II and DDR II specification was mutually defined, developed and delivered by the QDR Co-Development Team for the high-speed networking market.
Engineering samples of NEC's first QDR II/DDR II SRAM products are available now from Sunrise, with production-level availability scheduled for third quarter 2002.
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