摘要:
A semiconductor memory device comprises active pull-up circuits (APU.sub.1, APU.sub.2) each provided for one bit line (BL.sub.1, BL.sub.1). Each active pull-up circuit (APU.sub.1) has connections to two bit lines. That is, an active pull-up circuit (APU.sub.1) for a first bit line (BL.sub.1) comprises a first transistor (Q.sub.1) connected between a power supply terminal (V.sub.CC) and the first bit line, a second transistor (Q.sub.2) connected between the gate of the first transistor and the first bit line, and a capacitor (C.sub.1) connected to the gate of the first transistor. The gate of the second transistor is connected to a second bit line (BL.sub.1) which is paired with the first bit line. The capacitor receives an active pull-up signal (.phi..sub.AP). A circuit (Q.sub.3, Q.sub.4, Q.sub.5) is provided for transmitting a high level potential to the gate (N.sub.1) of the first transistor to precharge the capacitor.
摘要:
A semiconductor memory device has fuses coated with a protecting layer. The protecting layer is selectively etched to open windows so as to expose narrow center portions of the fuses. After the opening of the center windows, the fusing operation of the fuses is carried out to open a gap in the center window portion of the fuse material. In a preferred embodiment, another protective layer is then added to fill the gaps in the blown fuses.
摘要:
A semiconductor memory device wherein a redundancy memory cell array incorporated with main memory cell matrixes is disclosed. Memory cells of the main memory cell matrixes are selected by first and third decoders while memory cells of the redundancy memory cell array are selected by second and third decoders. When the redundancy memory cell array is selected by the second decoder, the transmission of a clock signal to the first decoders is stopped by a switching circuit.
摘要:
A semiconductor integrated circuit including a memory unit for storing address information of a failed circuit portion and for replacing the failed circuit portion by a redundant circuit portion. The semiconductor integrated circuit provides a comparison unit for detecting coincidence between data read from the memory unit and a received input address. Data produced from the comparison by the comparison unit is delivered through an external connection terminal.
摘要:
In a semiconductor memory device having stacked capacitor-type memory cells, the capacitor of each memory cell comprises an electrode, an insulating layer, and a counter electrode. The electrode is connected electrically to a source or drain region of a transfer transistor and extends over a part of a word line adjacent to another word line serving a gate electrode of the transfer transistor, at which part no memory cell is formed.
摘要:
A semiconductor memory device including at least two groups, each of said groups including a plurality of memory cell array blocks. The number of the memory cell array blocks which are activated in one group is made different from the number of memory cell array blocks which are activated in another group by providing a sequential circuit, thus reducing the maximum power consumption.
摘要:
In a semiconductor memory device having stacked capacitor-type memory cells, the capacitor of each memory cell includes a base electrode, an insulating layer, and a counter electrode. The base electrode of each memory cell is partly superposed without contact on the base electrodes of other adjacent memory cells.
摘要:
A semiconductor memory device has an operational mode such as a nibble mode or page mode, a first address strobe signal is kept in an active state, and a second address strobe signal is successively switched between an active state and standby state, thereby enabling successive data output. Previous output data is reset once, in accordance with the switchover of the second address strobe signal to the active state while the first address strobe signal is in the active state, before outputting data, and the reset operation for outputting is also performed when both the first and second address strobe signals are switched to the standby state, so that the period in which the data is output is expanded.
摘要:
A semiconductor integrated circuit device having a fuse-blown type ROM for storing information concerning defective bits for the replacement of defective bits in a semiconductor memory device, etc., with redundant bits. The integrated circuit device comprises fuses for constituting the ROM, pads for supplying a melting current to the fuses, and PN junctions each being formed, for example, by a semiconductor substrate and a diffusion layer formed on the semiconductor substrate. Each of the fuses is melted by applying voltage to a circuit connecting the PN junction, the fuse, and the pad so that the PN junction is forward biased, thereby supplying a large current to the fuse.
摘要:
A dynamic semiconductor memory device comprising: (1) one-transistor one-capacitor type memory cells connected between word lines and bit lines and (2) flip-flops, each flip-flop being connected between a pair of word lines to clamp an unselected word line in the pair of word lines to the low voltage of a power source, thereby preventing a subsequent erroneous reading operation as a result of an increase in potential of the unselected word line.