摘要:
A circuit for supplying a stress to memory cells of a semiconductor memory device having the plurality of the memory cells respectively connected to a word line and a bit line comprises a circuit for generating precharge voltage for bit line, a bit line precharging and equalizing circuit which is connected between said circuit for generating precharge voltage for bit line and said memory cells, a pad connected to the bit line precharging and equalizing circuit for applying a desirable voltage to said memory cells through the corresponding bit lines, and a circuit connected to the circuit for generating precharge voltage for bit line for generating a signal for stopping the operation of said circuit for generating precharge voltage for bit line, whereby cell checker patterns can easily be realized in order to screen out possible failures not only in gate oxide films but also in capacitor dielectrics, storage node junctions or the like by applying an arbitrary stress voltage from the outside of the device.
摘要:
A memory cell array of a semiconductor memory device is split into memory blocks. A DRAM/nonvolatile mode switching circuit makes each memory cell operate similarly to a DRAM when each memory block is accessed from the exterior while making each memory cell operate as a nonvolatile memory cell to require no refreshment when each memory block is not accessed for a constant period. An internal timer circuit manages a waiting time for the memory block shifting to a nonvolatile mode after entering a non-accessed state. Thus, the semiconductor memory device can attain stable power consumption reduction hardly influenced by a user state.
摘要:
A surface-mounting structure of a surface-mounting electronic device onto the surface of a circuit medium is provided. An external terminal of the device has a first mounting surface on which a first set of protrusions are formed. The first mounting surface includes a first uncovered space in the remaining area of the first set of protrusions. A mounting pad of the circuit medium has a second mounting surface on which a second set of protrusions are formed. The second mounting surface includes a second uncovered space in the remaining area of the second set of protrusions. The second mounting surface is opposite to the first mounting surface. The second set of protrusions are inserted into the first uncovered space. The first set of protrusions are inserted into the second uncovered space. A bonding material is placed between the first and second mounting surfaces. The bonding material provides a mechanical engagement between the first and second mounting surfaces, thereby mechanically and electrically connecting the terminal of the device onto the mounting pad of the circuit medium. The mounting process and its process control are simplified, and connection accuracy and reliability are improved.
摘要:
A nonvolatile semiconductor memory device is provided which can accurately read data with low consumption current. The flash memory selects a memory cell according to an external address signal in response to the leading edge of a clock signal and reads data from the memory cell in response to the leading edge of the clock signal in the normal read mode, whereas, in the low-speed read mode for performing a read operation with lower power consumption than that of the normal read mode, reads data from the memory cell in response to the trailing edge of the clock signal. Therefore, data can be accurately read even if noise is generated in response to the leading edge of the clock signal in the low-speed read mode, because the noise level has dropped at the trailing edge of the clock signal.
摘要:
An image processing apparatus includes a motion-vector calculating unit that calculates motion vectors among images taken by an imaging device; a candidate-center calculating unit that calculates candidate centers of a movement of the imaging device and/or candidate centers of a movement of an imaging subject seen on each of the images based on the motion vectors calculated by the motion-vector calculating unit; a reliability calculating unit that calculates a reliability of each of the candidate centers based on a distance between the candidate centers calculated by the candidate-center calculating unit; and a motion-information obtaining unit that obtains information for detecting a motion change among the images taken by the imaging device based on the reliability calculated by the reliability calculating unit.
摘要:
In a flash memory, after an initial write operation ends, each bit line associated with a memory cell subjected to a write is precharged and each bit line associated with a memory cell that is not subjected to the write is discharged and verified to detect a memory cell low in threshold voltage and a memory cell thus detected is subjected to an additional write. The verification can be verified without being affected by a current flowing through the memory cell that is not subjected to the write. All memory cells can have their respective threshold voltages set accurately.
摘要:
In this AG-AND type flash memory, a layered bit line configuration where a memory array is divided into a plurality of sub blocks, new main bit lines are allocated so as to correspond to each sub block, and a main bit line is selectively connected to a global bit line in an upper layer via a switch is adopted, so that charge sharing write-in is carried out between two main bit lines. Accordingly, write-in of data into the flash memory can be carried out with low power consumption, and the threshold voltage can be controlled with precision.
摘要:
When a data write sequence is started, initially, write data is latched in a data latch circuit corresponding to one memory mat. Then, a program pulse is applied to the memory mat, and data read from a memory cell, which is a data write target bit in the memory mat, is performed. Thereafter, verify determination of the memory mat is performed. After a verify operation for the memory mat is completed, a program pulse is applied to another memory mat, and a verify operation for another memory mat is performed.
摘要:
In a flash memory, after an initial write operation ends, each bit line associated with a memory cell subjected to a write is precharged and each bit line associated with a memory cell that is not subjected to the write is discharged and verified to detect a memory cell low in threshold voltage and a memory cell thus detected is subjected to an additional write. The verification can be verified without being affected by a current flowing through the memory cell that is not subjected to the write. All memory cells can have their respective threshold voltages set accurately.
摘要:
In a chip type solid electrolytic capacitor including a capacitor element and a packaging resin covering the capacitor element, the packaging resin has a mount surface and a side surface adjacent to the mount surface. A terminal is electrically connected to the capacitor element and coupled to the packaging resin. The terminal extends along the mount surface and the side surface to have an outer surface exposed from the packaging resin and to have an inner surface opposite to the outer terminal surface. The inner surface has a stepwise shape formed by forging.