4Mb FRAM does not require a battery for data backup

[Ziya]

http://www.ramtron.com/4MbFRAM/Default.asp

How FRAM Works

At the core of FRAM technology are tiny ferroelectric crystals integrated into a capacitor that allow FRAM products to operate like fast nonvolatile RAMs. The electric polarization of the ferroelectric crystals is shifted between two stable states by the application of an electric field. The direction of this electric polarization is sensed by internal circuits as either a high or a low logic state. Each orientation is stable and remains in place even after the electric field is removed, preserving the data within the memory without periodic refresh.

TI fabricates planar FRAM cells using a capacitor-on-plug approach to minimize cell area. The ferroelectric capacitor is formed using Iridium electrodes and a thin Lead Zirconate Titanate (PZT) ferroelectric layer.