摘要:
The present invention concerns a semiconductor device having a low-resistivity wiring structure. Wirings formed directly on a hill and valley structure result in a thin portion and, in an extreme case, a disconnected portion. This increases the resistivity of wirings on the hill and valley structure and lowers the reliability of the connection. In a case where the wirings are data lines of a memory, with an increased effective length, the resistance and the parasitic capacitance of the data line is greater. The above mentioned problems have been solved by wirings which comprise at least two layers of conductive film including a first conductive film as a lower layer and a second conductive film as an upper layer, and the first conductive layer has a surface moderating or planarizing the hills and valleys in the underlying material.
摘要:
An arrangement is provided to enhance the speed in the operation of erasing and programming of a nonvolatile semiconductor memory that is driven by a single supply voltage and to reduce the number of transistors making up the subword decoder circuit thereby minimizing the size of the device. For this purpose, in the subword decoder circuits WDi1-WDij that drive the word lines Wi1-Wij, the block selection address lines Bip and Bin generated from the first address line group are used as supply voltages for the inverter circuit that controls the voltage of the word line, and the gate selection address line Gj generated from the second address line group is used a gate input line.
摘要:
A clock-generating circuit for forming internal clock signals by comparing a signal obtained by delaying, through a variable delay circuit, an input clock signal input through an external terminal with the input clock signal through a phase comparator circuit, and so controlling the delay time of the variable delay circuit that they are brought into agreement with each other, wherein the clock-generating circuit and an internal circuit to be operated by the clock signals formed thereby are formed on a common semiconductor substrate, and an element-forming region in which the clock-generating circuit is formed is electrically isolated from an element-forming region in which the digital circuit is constituted on the semiconductor substrate relying upon the element-isolation technology. The power-source passages, too, are formed independently of other digital circuits.
摘要:
A clock-generating circuit for forming internal clock signals by comparing a signal obtained by delaying, through a variable delay circuit, an input clock signal input through an external terminal with the input clock signal through a phase comparator circuit, and so controlling the delay time of the variable delay circuit that they are brought into agreement with each other, wherein the clock-generating circuit and an internal circuit to be operated by the clock signals formed thereby are formed on a common semiconductor substrate, and an element-forming region in which the clock-generating circuit is formed is electrically isolated from an element-forming region in which the digital circuit is constituted on the semiconductor substrate relying upon the element-isolation technology. The power-source passages, too, are formed independently of other digital circuits.
摘要:
A synchronous DRAM is provided which includes arrangements for operations of power supply circuitry based upon whether the DRAM is in a power down mode or not. In one embodiment, a first power supply circuit and a second power supply circuit are provided which both receive externally supplied voltages and output internal supply voltages. The first power supply circuit is not in operation when a semiconductor device of the synchronous DRAM is in a power down mode. However, the second power supply circuit is continuously in operation during the power down mode. In another arrangement, the operation of a voltage limiter circuit is controlled based on whether or not the DRAM is in a power down mode.
摘要:
A semiconductor integrated circuit is provided having first and second logic circuits coupled to first and second sub-power supply lines, respectively. First and second switching transistors are also provided to connect the first and second sub-power supply lines to a main power supply line. The first and second switching transistors are kept off in an operation stop state of the first and second logic circuits, and are kept on in operable state of the first and second logic circuits.
摘要:
A synchronous DRAM is provided which includes arrangements for operations of power supply circuitry based upon whether the DRAM is in a power down mode or not. In one embodiment, a first power supply circuit and a second power supply circuit are provided which both receive externally supplied voltages and output internal supply voltages. The first power supply circuit is not in operation when a semiconductor device of the synchronous DRAM is in a power down mode. However, the second power supply circuit is continuously in operation during the power down mode. In another arrangement, the operation of a voltage limiter circuit is controlled based on whether or not the DRAM is in a power down mode.
摘要:
A field-effect semiconductor element implemented with a fewer number of elements and a reduced area and capable of storing data by itself without need for cooling at a cryogenic temperature, and a memory device employing the same. Gate-channel capacitance is set so small that whether or not a trap captures one electron or hole can definitely and distinctively be detected in terms of changes of a current of the semiconductor FET element. By detecting a change in a threshold voltage of the semiconductor element brought about by trapping of electron or hole in the trap, data storage can be realized at a room temperature.
摘要:
A clock-generating circuit for forming internal clock signals by comparing a signal obtained by delaying, through a variable delay circuit, an input clock signal input through an external terminal with the input clock signal through a phase comparator circuit, and so controlling the delay time of the variable delay circuit that they are brought into agreement with each other, wherein the clock-generating circuit and an internal circuit to be operated by the clock signals formed thereby are formed on a common semiconductor substrate, and an element-forming region in which the clock-generating circuit is formed is electrically isolated from an element-forming region in which the digital circuit is constituted on the semiconductor substrate relying upon the element-isolation technology. The power-source passages, too, are formed independently of other digital circuits.
摘要:
A memory system comprises a controller capable of controlling a memory operation, and memory connectors capable of mounting memory modules therein, both of which are provided on a system board. Each of the memory modules has a plurality of memory chips connected to module data wirings and module power wirings respectively. The module data wirings of each memory module are connected in series form through series paths lying within the connectors. Each individual module data wirings do not constitute branch wirings to system data wirings on the system board. Thus, such signal reflection as caused by branching from the data wirings on the system board is not developed. Since the power is supplied in parallel from the system board through parallel paths lying within the connectors, the supply of the power is stabilized.