Patent application number | Description | Published |
20090090973 | SEMICONDUCTOR DEVICE AND METHOD OF MANUFACTURING THE SAME - A semiconductor device includes a device isolation insulating film which is provided in a semiconductor substrate, and an insulated-gate field-effect transistor which is disposed adjacent to the device isolation insulating film in a gate length direction, the insulated-gate field-effect transistor including a gate insulation film which is provided on the semiconductor substrate, a gate electrode which is provided on the gate insulation film, a pair of impurity diffusion layers which are provided spaced apart in the semiconductor substrate in a manner to sandwich the gate electrode, and a redundant impurity diffusion layer which is provided between the device isolation insulating film and one of the pair of impurity diffusion layers. | 04-09-2009 |
20090279377 | SEMICONDUCTOR MEMORY DEVICE - A semiconductor memory device comprises a memory cell array including a plurality of mutually intersecting word lines and bit lines, and a plurality of memory cells connected at intersections thereof and each having a read port and a write port provided independently; and a plurality of word line drivers operative to drive the word lines. The elements contained in the memory cell have respective sizes in common with the elements contained in the word line driver. | 11-12-2009 |
20090303777 | SEMICONDUCTOR MEMORY DEVICE - A semiconductor memory device according to an aspect of the invention includes plural writing word lines; first and second writing bit lines that intersect with the writing word lines; and plural memory cells that are provided at portions in which the plural writing word lines and the first and second writing bit lines intersect with each other. In the semiconductor memory device, the memory cell includes a flip-flop circuit that includes first and second nodes of a complementary pair; a first transfer transistor that is connected between the first writing bit line and the first node, a gate of the first transfer transistor being connected to the writing word line; and a second transfer transistor that is connected between the second writing bit line and the second node, a gate of the second transfer transistor being connected to the writing word line. The first and second writing bit lines are in a floating state whenever data is not written in the memory cell. | 12-10-2009 |
20100232244 | SEMICONDUCTOR MEMORY DEVICE - A semiconductor memory device comprises: a memory cell array including a plurality of word lines, a plurality of bit line pairs containing a first bit line and a second bit line, and a plurality of memory cells; a plurality of replica bit lines formed in the same manner as the first and second bit lines; a write buffer circuit operative to drive the first or second bit line to the ground voltage; a replica write buffer circuit operative to drive the replica bit lines to the ground voltage; and a boot strap circuit operative to drive the first or second bit line currently driven to the ground voltage further to a negative potential at a timing when the potential on the replica bit lines reaches a certain value. | 09-16-2010 |
20100302831 | SEMICONDUCTOR STORAGE DEVICE - A memory cell of a static random access memory (SRAM) includes a pair of drive transistors, a pair of load transistors, a pair of write-only transfer transistors, a pair of read-only transfer transistors, a pair of read-only drive transistors, and a pair of column selection transistors. The memory cell also includes a word line, a pair of write bit lines, a pair of read bit lines, and a column selection line. | 12-02-2010 |
20110069574 | SEMICONDUCTOR MEMORY DEVICE - A semiconductor memory device includes a memory cell array, a word line driver, and a bit line booster. The memory cell array has multiple word lines WL, multiple bit line pairs BL, and multiple memory cells MC provided at the respective intersections of the word lines WL and the bit line pairs BL. The word line driver drives a selected word line WL to a positive voltage VWL when data is written to the memory cells MC. The bit line booster drives a selected bit line pair BL to a negative voltage VBL corresponding to the voltage VWL when data is written to the memory cells MC. | 03-24-2011 |
20120063210 | Semiconductor Device - Provided is a semiconductor device including an SRAM memory cell that includes: a first inverter and a second inverter that are connected to a single power-supply node and are cross-coupled to each other; a first transfer transistor; and a second transfer transistor. A predetermined voltage is applied from a voltage generation unit to a source terminal of an NMOS transistor included in the first inverter. An inversion detection unit is connected to the SRAM memory cell via the first and second transfer transistors. When a word-line selection potential is applied to a word line with the SRAM memory cell having data written therein, the inversion detection unit detects whether or not the data written in the SRAM memory cell is inverted. In accordance with the detection result of the inversion detection unit, a word-line selection-potential determination unit controls the word-line selection potential to be applied to the word line. | 03-15-2012 |
20140376319 | DELAY CIRCUIT AND SEMICONDUCTOR MEMORY DEVICE - According to an embodiment, a load adjusting circuit adjusts the load of an inverter circuit based on a threshold voltage of a first conductive type transistor provided on the inverter circuit, and a driving force adjusting circuit adjusts the driving force of the inverter circuit based on the threshold voltage of the first conductive type transistor. | 12-25-2014 |