Elpida Enables 1.60GHz DDR3 Memory with New Technologies

Elpida Develops New Circuit Technologies for DDR3 Memory

by Anton Shilov
02/12/2006 | 11:40 PM

Elpida Memory, a leading maker of memory, announced the development of new high-speed, low-power circuit technologies for high-speed DDR3 SDRAM in a paper presented at the International Solid State Circuits Conference (ISSCC). Using the new technologies, Elpida produced a 512Mb DDR3 device with a column access time of 8.75ns and clock-speed of 1.60GHz.

 

The new technologies consist of a transfer circuit that realizes high-speed access time (data readout time), and a data readout timing generator that enables stable high-speed data transfer rate in the dynamic random access memory’s (DRAM’s) output block.

Elpida found that the data readout speed could be increased by blanket-reading data from the DRAM’s memory array and transferring that data to the output circuit using time division, thus cutting down on the number of data signal lines required and reducing the parasitic capacitance. The company also devised a technology that would enable high-speed data transfer by developing counters that could control generation of the data readout timing on a clock with double the cycle time of DDR2 while still providing enough operating margin.

Elpida produced 512Mb DDR3 SDRAM devices using 90nm process technology. Repeated evaluation results showed that even at low 1.5V operation, consistent, high yield production of DDR3 SDRAM chips with low voltage-a column access time of 8.75ns and a data transfer rate of 1.6Gb/s is achievable using these new technologies. Elpida is ready to start the production of DDR3 SDRAM using these new technologies, the company indicated.

The new technologies developed by Elpida are the following:

Tests results show that the circuit supports an input clock of 800MHz and achieves a transfer rate in the DRAM’s output block of 1.6Gb/s (or 1600MHz). Moreover, even when a high-speed clock was used, the standby current during clock operation showed a 22% drop.