Abstract:
PROBLEM TO BE SOLVED: To provide a ferroelectric memory comprising a DDR interface which improves data maintainability at instantaneous power interruption, and to provide a memory system. SOLUTION: When a source voltage is less than a predetermined value V down, power-interruption notification is transmitted to the ferroelectric memory by using a CKE pin of a DDR interface. When the power-interruption notification is transmitted, after the completion of reading data from a memory cell to a sense amplifier circuit, data held in the sense amplifier circuit is written back to the memory cell. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a manufacturing method of a semiconductor device capable of satisfactorily extracting characteristics of a ferroelectric film even if it is made thin. SOLUTION: After a lower electrode film 9 is formed, the ferroelectric film 10 is formed on the lower electrode film 9. Then, the ferroelectric film 10 is crystallized by subjecting the ferroelectric film 10 to heat treatment in an oxygen atmosphere. Further, an upper electrode film 11 is formed on the ferroelectric film 10. Upon the heat treatment (crystallization annealing), a flow rate of oxidative gas is assumed to be 10 sccm to 100 sccm. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a thin film laminate where a thin film having superior crystallinity, sufficient piezoelectricity, electrostriction property, ferroelectricity or electro-optical effect can epitaxially be grown, and to provide an actuator element using the thin film laminate, a filter element, a ferroelectric memory and an optical deflection element. SOLUTION: The thin film laminate 10 has a single crystal substrate 11, and a zirconium oxide film 12, a C-rare earth structure film 13 and a simple perovskite structure film 14, which are sequentially laminated on the single crystal substrate 11 with epitaxial growth. The C-rare earth structure film 13 of rare earth oxide having a crystal structure of a C-rare earth structure (cubic join) is formed on the zirconium oxide film 12. Thus, the simple perovskite structure film 14 consisting of metal oxide of the crystal structure having a simple perovskite lattice can be formed in plane orientation (001). The simple perovskite structure film 14 is rotated with respect to the C-rare earth structure film 13 by 45° with a crystal growth direction as a rotation axis so as to grow it. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
분할 커패시터를 갖는 감지 증폭기를 사용하여 메모리 셀을 판독하는 방법 및 디바이스가 설명된다. 감지 증폭기는 판독 동작의 특정 부분 동안 더 큰 정전용량을 제공하고 판독 동작의 다른 부분 동안 더 낮은 정전용량을 제공하도록 구성될 수 있는 제1 커패시터 및 제2 커패시터를 포함할 수 있다. 일부 경우에, 제1 커패시터 및 제2 커패시터는 더 높은 정전용량을 제공하기 위해 판독 동작의 제1 부분 동안 신호 노드와 전압 소스 사이에 병렬로 결합되도록 구성된다. 제1 커패시터는 제2 부분 동안 더 낮은 정전용량을 제공하기 위해 판독 동작의 제2 부분 동안 제2 커패시터로부터 분리될 수 있다.
Abstract:
【課題】強誘電体メモリのビット線の放電によるプレート線へのノイズの発生を抑制する。 【解決手段】一対のビット線BL k ,BLb k に蓄積されている電荷を放電する第1の放電回路142と、一対のビット線に蓄積されている電荷を放電させる第2の放電回路141と、第1及び第2の放電回路のうちの第2の放電回路だけを動作させる低速放電モード、第1及び第2の放電回路を共に動作させる高速放電モード、第1及び第2の放電回路を共に停止させる停止モードを選択的に実行する制御部と、を含む。 【選択図】図3