摘要:
A semiconductor memory device having a semiconductor substrate includes a plurality of reference cells 4 and a plurality of bit lines 10. The reference cells 4 are formed in a region near the centerline of a predetermined region of the semiconductor substrate which is perpendicular to the bit lines 10. The bit lines 10 form pairs each composed of two adjacent bit lines. Two bit lines 10 in each pair have a first parallel state and a second parallel state in which positions of the two bit lines are reversed from the first parallel state. Each pair of bit lines 10 has at least one cross section 11 where one of the pair of bit lines 10 crosses the other, to switch between the first parallel state and the second parallel state. The cross section 11 is provided in the predetermined region of the semiconductor substrate such that the length of a bit line 10 in the first parallel state is equal to the length of the bit line 10 in the second parallel state. The semiconductor memory device is reduced in size.
摘要:
In order to omit a reset transistor between a storage node and a cell plate line of a memory cell, a cell plate line is fixed to a potential substantially equal to a ground potential and a bit line is driven with positive and negative voltages.
摘要:
In order to omit a reset transistor between a storage node and a cell plate line of a memory cell, a cell plate line is fixed to a potential substantially equal to a ground potential and a bit line is driven with positive and negative voltages.
摘要:
In a semiconductor substrate of a first conductivity type, first and second high-concentration layers of a second conductivity type are formed in spaced relation to each other. A reference voltage is applied to the second high-concentration layer. A conductive layer provides an electrical connection between the first high-concentration layer and an input pad for inputting an input signal to an input circuit or input/output circuit. A first low-concentration layer of the second conductivity type is formed in the region of the semiconductor substrate immediately underlying the first high-concentration layer.
摘要:
A memory control device for controlling a random access memory provides with an arbiter for generating write start and read start signals in response to WRITE and READ commands which are obtained by frequency-dividing writing and reading clock signals, respectively and a memory control circuit comprised of first and second delay circuits for delaying the write start and read start signals by predetermined times, respectively, and first and second RS flip-flop circuits for generating write and read control signals in response to the write start and read start signals, respectively, which are reset by reset signals output from the first and second delay circuits, respectively.
摘要:
A dynamic type semiconductor memory in which a bit line is made to be connected to an electric potential different from a precharge potential after a precharge of the bit line is effected and one of word lines is selected and before a sensing amplifier operates. Thereby, all data stored in memory cells of the same row address can be cleared or preset in a cycle. Further, data stored in all of memory cells of which the number is equal to that of row addresses multiplied by that of column addresses can be cleared or preset in cycles of which the number is equal to that of the row addresses. Consequently, a clearance of contents of or a presetting of all memory cells can be effected at a high speed.
摘要:
A semiconductor device contains circuits composed on a semiconductor substrate which are divided at least into two circuit blocks as seen from the aspect of supplying electrical power, and the pad and wiring for feeding a supply potential and/or grounding potential to the first circuit block, and the pad and wiring for feeding the supply potential and/or grounding potential to the second circuit block other than the first circuit block are electrically independent of each other. In this constitution, it is possible to prevent malfunctions of the second circuit block and distortions of the output signal due to fluctuations of the supply potential or grounding potential occurring during operation of the first circuit block. It is also possible to prevent malfunctions of the first circuit block and distortions of the signal on the first circuit block due to fluctuations of the supply potential or grounding potential occurring due to a malfunction of the second circuit block.
摘要:
This invention is realized, in sum, by providing at least one reset input terminal, aside from a reset input terminal to which a request end signal is supplied, to output stage RS flip-flops of plural latch circuits to which plural request signals are supplied respectively. The signal of a first output terminal of the output stage RS flip-flop of a specified latch circuit of the plural latch circuits is supplied to a reset input terminal of the output stage RS flip-flop of the other latch circuit and a delay circuit is connected between a second output terminal and the other reset input terminal of the output stage RS flip-flops of each latch circuit. Accordingly, if plural request signals are supplied at substantially the same time, the competition of these request signals may be settled. Besides, by setting the delay time of each delay circuit longer than the time required from the supply of the signal to the set input terminal of the corresponding output stage RS flip-flop until the signal is latched in the output terminal, even if pulsive signals are supplied to the output stage RS flip-flops, oscillation of the output stage RS flip-flops may be prevented.
摘要:
In a semiconductor integrated circuit device having at least one shift register, a plurality of 5 stages of the shift register are electrically connected in series, the 1st stage of said shift register is located in the closest position to the data input terminal, and other succeeding stages are sequentially and straightly located at intervals; the chain of the stages is folded at a particular stage, and further succeeding stages are sequentially and straightly located at intervals so as to fill in the spaces between the other stages, thus, the unbalance of the load capacitance between said stages and the functional unbalance between the shift registers can be minimized.