NEC Electronics Corp. and its subsidiaries in the US and Europe today introduced the industry’s first Pseudo Static Random Access Memory (PSRAM) device [.jpg] designed in accordance with the Common Specifications for Mobile RAM (COSMORAM) Rev. 3, a memory interface standard developed and promoted jointly by Toshiba, Fujitsu, and NEC Electronics for the mobile handset market.
“The rapid evolution of mobile handsets with advanced functions such as music playback, digital image processing, games and videoconferencing has spawned a need for memory devices that offer a combination of superior performance with low power consumption,” stated Masazumi Ikebe, general manager, System Memory Division.
“By developing our latest PSRAM solution in line with the COSMORAM Rev. 3 standard, NEC Electronics aims to help system developers meet these demands, while achieving faster time-to-market and lower system costs.”
NEC Electronics’ μPD46128953 device has a 128-megabit memory capacity and achieves a stable operating frequency of 83MHz during burst mode** while maintaining a low operating voltage of 1.8V. This performance was made possible by NEC Electronics’ development of a new type of delay circuit that regulates the internal pulse mechanism.
A 32-bit high-speed I/O interface doubles previous data transmission speeds achieved with 16-bit interfaces, enabling rapid communication with the handset’s central processing unit (CPU). Three driver output settings allow system developers to adjust the level of noise, setting the optimal configuration for their application. In standby power mode only necessary memory blocks remain operational, enhancing power savings. The device is available in a 127-pin plastic fine pitch ball grid array (FBGA) package.
The μPD46128953 is the industry’s first product to be standardized to COSMORAM Rev.3, the specifications agreed upon by Toshiba, Fujitsu and NEC Electronics in September 2004. The three companies have collaborated on random access memory since 1998, and introduced the first COSMORAM standard in 2002. As a result of these agreements, customers can use PSRAM solutions from the three companies interchangeably, eliminating the need for separate product designs for the memory portion of the handset, and ensuring steady procurement as the companies can act as alternative supply sources for each other. Via: NEC Electronics