NAND

Memory Issues in Space & Medical Applications

How an alpha particle disrupts a memory bitThe Memory Guy was recently asked about using memories in a satellite. What would be a good technology to use in a space application?

The problem with space is that there is a lot of radiation.  Radiation on the earth’s surface is lower because it is stopped by the atmosphere, but in space there is an abundance of radiation that interferes with most semiconductors.  Radiation is also a concern in certain medical applications where a memory must maintain its contents while undergoing sterilization through irradiation.  Experiments on conventional flash memories have shown data loss at only 2% of the Continue reading

Obama Honors SanDisk Co-Founder

Eli Harari Receiving National Medal of Technology and Innovation. Photo Credit: Ryan K Morris and the National Science and Technology Medals FoundationSanDisk co-founder Eli Harari was awarded the National Medal of Technology and Innovation on November 20 by President Obama.  The medal, which was bestowed upon Dr. Harari in a White House ceremony, is the United States’ highest honor for scientific and technological achievement, and  recognizes those whose lasting contributions have created a greater understanding of the world and improved the lives of many.

Harari co-founded SanDisk more that 25 years ago with the vision that flash memory would be used to store data in mobile products, a vision that initially took seed in photography in the 1990s, and has since become the fastest-growing Continue reading

Is Apple Losing Dollars to Save a Few Cents?

Is Apple Losing Big Bucks by Trimming its Costs by a Few Cents?An article in a recent issue of Business Korea posits that Apple may be having trouble stemming from the company’s adoption of TLC flash in it’s new iPhone 6.

The article states:

considering that technical defects mainly occur in the 128GB version of the iPhone 6 Plus, there might be a problem in the controller IC of triple-level cell (TLC) NAND flash.

The problem has led to numerous warranty replacements and the looming prospects of a recall.

(Note that Continue reading

Fundamentals of Memory – Free Online Course

Fundamentals of Memory Course - EE TimesSome time ago The Memory Guy was asked by Numonyx (later acquired by Micron) to put together an online course for EE Times on memory technologies, explaining how each one works and where it is used.

Although the course was very well received, I never posted a link to it on The Memory Guy blog.  This post is intended to correct that error.

The course runs 75 minutes and covers the basics of DRAM, non-volatile RAM, SRAM, NAND flash, NOR flash, mask ROM, and EEPROM.  It explains each technology’s advances in size, cost and performance, leading up to the development of Continue reading

Is the DRAM Market Entering a Shortage?

DRAM Spot Prices are Consistently above ContractLong-term clients of mine, even those dating back to my decade at Dataquest in the 1990s, are familiar with the concept that spot prices behave differently during a shortage.  When there is too much DRAM spot prices remain below contract prices, because OEMs who bought too much product clear their inventory at quarter end (and other times) by selling at a loss.

During a shortage the opposite is true: OEMS find that they can’t get as much DRAM as they wanted through their contract sources, so they shop for the balance on the spot market.  Since there are more buyers than sellers, spot prices invariably raise higher than contract prices.

When the prices change from one state of affairs to the other then it is safe to assume that Continue reading

What is a “Multilayer Cell”?

MLCFrom time to time I get questions from investors in the memory business asking: “What is a multilayer cell?”

The answer is: “There is no such thing: It’s a misstatement.”

The term “MLC” has, by a number of people, been mistranslated to “multi-layer cell.”  The misunderstanding appears to have originated in the financial community.  People in the flash memory business never use the term at all.

Yes, we talk about MLC, but to us the term means “multilevel cell”.

A multilevel cell is a cell that uses varying voltage levels to represent different states.  With four voltage levels the resulting four states on a single cell can be turned into Continue reading

Hynix Recovery – Not so Soon?

Hynix Wuxi FireDuring SK hynix’ October 29 earnings call the company further clarified the status of its Wuxi fab line that was hit by a fire on September 4.  In brief, the company may miss its expected end-November date to recover to full operation.

Interestingly, although DRAM bit shipments declined by 2% because of the fire, revenues increased by 3% thanks to price increases caused by the resulting tight DRAM supply.  This gave the company a revenue boost taking total semiconductor revenues from ₩3.93 trillion ($3.54B US) in the second quarter to ₩4.08 trillion ($3.66B US) in the third quarter.  Not only was this revenue a record number for SK hynix, but margins also reached a record high.

All in all, it was a very good quarter, despite the fire, and perhaps because of it.

The company disclosed that restoration of the air ventilation system and the clean room have been Continue reading

Micron NAND Reaches 16nm

Die Photo of Micron 16nm 128Gb NAND chipMicron has announced that it is sampling a new 128Gb NAND flash chip based upon a 16nm process, with production slated for the fourth quarter.  To The Memory Guy’s knowledge this is the tightest process available.

The company, with its partner Intel, gained a lead with its 20nm process generation through its use of a Hi-k tunnel dielectric, a new material that replaces more conventional silicon dioxide layer with a new material (Micron won’t say what) that yields the same capacitance with a thinner layer.  This has become very important with today’s tight processes because of issues of inter-cell interference.

Other NAND makers are migrating to Continue reading

Macronix Solves Flash Wear Problem

Macronix Headquarters, Hsinchu TaiwanThe December issue of the IEEE Spectrum includes a fascinating article about a 100 million cycle flash memory developed by Macronix.  The company will present this design at at IEDM this month.

In brief: Macronix’ researchers buried a heater in the array to heat the tunnel dielectric, annealing out the disruptions & traps that might cause a bit to fail.

A prototype has so far been tested more than 100 million cycles and it shows no sign of impending failure.  Researchers believe that it is likely to reach one billion or more cycles, but such testing will take several months.  This just may be able to Continue reading

Samsung Revenues Reflect NAND Price Increase

Samsung Memory Revenue History 3Q09-2Q12NAND prices have increased since July, and that appears to have helped Samsung to increase its memory revenues in the past quarter.  That comes as a welcome change!

As this post’s graphic illustrates the company has has seen downward-trending memory revenues for five of the past six quarters, but Q2 revenues increased by ten percent.  Interestingly enough, the last quarter-to-quarter increase was a miniscule 0.3% one in Q2 of 2011.  It looks as if growth tends to regularly occur in Samsung’s second quarter.

Last quarter’s revenue growth helps to debunk rumors that Samsung was Continue reading

Contact

Jim Handy Objective Analysis Memory Market Research +1 (408) 356-2549 Jim.Handy (at) Objective-Analysis.com

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