F-RAM

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Also found in: Acronyms.

F-RAM

(1) (fram) (FRiend spAM) Jokes and information forwarded directly to friends via email as well as social media notifications every time people post something they think is memorable. See spam.

(2) (Ferromagnetic RAM) A non-volatile memory that records bits on a magnetic surface. See MRAM.

(3) (Ferroelectric RAM) A non-volatile, random access memory technology from Ramtron International Corporation, Colorado Springs, CO (www.ramtron.com). With product shipping since 1993, F-RAM was the first commercial non-volatile RAM on the market using standard CMOS fabrication. It was initially designed as a high-performance alternative to EEPROM memory with write speed that is orders of magnitude faster and virtually unlimited write cycles. Having the attributes of RAM and the non-volatility of flash, F-RAM may eventually replace flash, DRAM and SRAM.

Polarization in a Crystal
F-RAM uses a ferroelectric capacitor composed of a crystal made up of lead and oxygen atoms plus zirconium or titanium. The crystal has two stable states. When an electric field is applied, the zirconium or titanium atom changes position. The read circuit detects the polarity of the atom as a difference in voltage, which determines the 0 or 1.

The ferroelectric name was chosen because the hysteresis characteristic of the capacitor's charge is similar to ferromagnetic materials. It is somewhat misleading because the capacitor is not made of iron (ferrous), and it is not influenced by magnetic fields. See future memory chips.


The Perovskite Crystal
Ferroelectric capacitors use perovskite crystals, which are found in certain rocks. Named after Russian mineralogist L. A. Perovski, the red dot in the middle is the titanium or zirconium atom, which changes its position. (Image courtesy of Ramtron International Corporation, www.ramtron.com)







Easy Integration
Providing the fastest non-volatile memory in this microcontroller (MCU), a small amount of F-RAM is integrated on this chip with SRAM and flash memory, input/output and processing circuits. (Image courtesy of Ramtron International Corporation, www.ramtron.com)







Just A Few Bits
These Ramtron chips provide non-volatile storage of two or four F-RAM bits in order to maintain the state of a single switch or relay (top) or an LED (bottom). When power is turned back on, these "Nonvolatile State Saver" ICs provide the last known state. (Image courtesy of Ramtron International Corporation, www.ramtron.com)
References in periodicals archive ?
FeRAM shares flash memory's ability to retain data even when not powered, and combines it with the fast operating characteristics of DRAM.
Toshiba will boost its research and development in FeRAM with an eye on its wider use, including high-performance mobile digital equipment and computers.
Ishiwara, "Impurity substitution effects in BiFe[O.sub.3] thin filmsm-dash From a viewpoint of FeRAM applications," Current Applied Physics, vol.
[1] FRAM: Ferroelectric Random Access Memory (also referred to as FeRAM).
Its principle applications are in the deposition of ferroelectric materials for FeRAM (strontium bismuth tantalate or SBT, bismuth lanthanum tantalate or BLT, and lead zirconium titanate or PZT) and high-k capacitor materials (hafnium silicate and barium strontium titanate or BST).
said Wednesday it and Infineon Technologies AG of Germany have jointly developed a ferroelectric random access memory (FeRAM) technology which provides ''the highest memory capacity yet reported'' for a FeRAM chip.
The 32-megabit device features a ''chained'' memory cell structure expected to facilitate further advances to higher-density FeRAM, the company said.
Different approaches toward that goal are studied at the moment, such as FeRAM, MRAM, or PCRAM to name just a few [3].
The FeRAM uses polarity to represent the desired "0" or "1" in a memory circuit.