Low power consumption

The following are calculations of Mobile RAM™ standby current.

Standby current (IDD6 at room temperature) of Mobile RAM used in mobile phones:

• 90 nm product device: 400 µA (512 Mbit stack product)
• 70 nm product device: 300 µA (1 Gbit product)

Thus, switching to the 70 nm process enables a 100 µA (0.1 mA) reduction in current consumed by memory.

In terms of a mobile phone's standby time, this means a 59-hour increase in standby time when compared to 90 nm process Mobile RAM products.

Typical specs for today's mobile phones: Battery capacity is 850 mAh Continuous standby time is 680 hours (stationary) Based on this, the standby current consumption is 850 mAh / 680 h = 1.25 mA. The 70 nm process Mobile RAM enables standby-mode memory current consumption to be reduced to 100µA (0.1 mA), so the continuous standby time becomes 850 mAh / (1.25 mA - 0.1 mA) = 739 h.

Mobile RAM density / volume ratios

In recent years, R&D competition has been heating up in the area of compact, light-weight mobile phones sporting advanced functions.

What can Elpida's 70 nm process Mobile RAM do to further improve mobile phones? Let us compare Elpida's conventional 90 nm process Mobile RAM with its new 70 nm process Mobile RAM.

In a conventional 90 nm process Mobile RAM, the maximum capacity of a chip to be encapsulated in a small package for mobile phones was 512 Mbits. (Two-layer and three-layer products realize 1 Gbit and 1.5 Gbits, respectively.)

In contrast, a 70 nm process Mobile RAM can incorporate 1 Gbit Mobile RAM in a package of about the same size as a 90 nm process product owing to chip miniaturization, which, by layering chips, realizes 2 Gbit and 3 Gbit packages. This improves the capacity/volume ratio by about 40%.

400 Mbps high-speed operation

We provide a lineup of 400 Mbps products to handle applications needed for even higher data transfer ability which accompanies the ever increasing high functionality of mobile phones.

Elpida's 70 nm process Mobile RAM is paving the way for smaller, lighter, more energy efficient devices featuring advanced functions.

In recent years, R&D competition has been heating up in the area of compact, light-weight mobile phones sporting advanced functions. Elpida's 70 nm process DRAM enables the DDR2-1066 to operate faster while using only 1.8 V power. Front Runner in Mass Production of 70 nm Process Devices Eyes a Comeback in DRAMs for PCs and Servers

* The explanations contained herein use electrical current, operation speed, operation temperature and other quantities measured by Elpida, but we do not guarantee the values of the data described. The values are for reference only. Please refer to the relevant data sheets for the guaranteed values of each product.

Mobile RAM is a trademark of Elpida Memory, Inc. All trademarks are the intellectual property of their respective owners.