摘要:
A semiconductor dynamic RAM provided with an I/O load (5) rendered inactive during a writing cycle comprises a monostable multivibrator (16) for receiving a read/write indicating signal W for indicating reading and writing data from and into a memory cell (2) and outputting a signal W having a shorter duration than that of the signal W at a down edge of the signal W as a trigger. The output signal W of the monostable multivibrator (16) is supplied as a control signal for rendering the I/O load (5) inactive.
摘要:
A semiconductor dynamic RAM provided with an I/O load (5) rendered inactive during a writing cycle comprises a monostable multivibrator (16) for receiving a read/write indicating signal W for indicating reading and writing data from and into a memory cell (2) and outputting a signal We having a shorter duration than that of the signal W at down edge of the signal W as a trigger. The output signal We of the monostable multivibrator (16) is supplied as a control signal for rendering the I/O load (5) inactive.
摘要:
A memory cell array is divided into four blocks #1 to #4. The blocks #1 and #3 are operated when a row address signal RA.sub.8 equals "0". The blocks #2 and #4 are operated when the row address signal RA.sub.8 equals "1". A spare row sub-decoder is provided in each of the blocks. Spare row sub-decoders in the blocks #1 and #2 are connected to a spare row main decoder through a single spare decoder selecting line. The spare row sub-decoders in the blocks #2 and #4 are connected to the other spare row main decoder through another spare decoder selecting line. The spare main decoders are responsive to the row address signal RA.sub.8 and row address signals RA.sub.2, RA.sub.2, . . . , RA.sub.7, RA.sub.7 for operating a spare row sub-decoder in a block which is in the operating state.
摘要:
A novel semiconductor memory device includes an address detection circuit that produces a short-width pulse in response to the detection of an address change. A column decoder-activating signal generator detects the start of the short-width pulse and in response generates a column decoder-activating signal. A second detection circuit detects the conclusion of the short-width pulse and generates a second pulse that triggers a preamplifier-activating signal that activates a preamplifier and latches the data that is present on the input/output line. A reset signal generator produces a reset signal to deactivate the column decoder-activating signal and to delay the preamplifier-activating signal. The preamplifier-activating signal generator and the reset signal generator are reset while the first pulse is output.
摘要:
A dynamic random access memory device having an input/output load connected between a pair of input/output lines and a control circuit used to generate an internal /RAS signal having a reset transition delayed with respect to the same transition of the external /RAS signal. The internal /RAS signal controls at least a word signal applied to a transistor of a selected memory cell and an enable signal applied to an enable transistor, whereby the time the transistor of the memory cell and the enable transistor become non-conductive is delayed with respect to the time at which a transfer transistor connected between each pair of bit lines and the input/output lines becomes non-conductive.
摘要:
44Gate potentials of transistors Q.sub.R0 and Q.sub.R1 provided in an active pull-up circuit APo are always controlled to be appropriate values by a clock signal .phi..sub.p. As a result, reverse flow of electric charge from a capacitor C.sub.R0 or C.sub.R1 to a bit line LB or BL can be prevented and unfavorable influence due to such reverse flow of electric charge can be avoided in operation of the active pull-up circuit APo.
摘要:
A semiconductor memory device comprises a data input switching circuit (20) connected between the output side of a write check bit generating circuit (2) and the input side of a check bit memory cell array (32), a data output switching circuit (30) connected to the input side of an address decoder (9), and an address switching circuit (10) connected to the output side of the address decoder (9). When a test mode is entered, the data input switching circuit (2), data output switching circuit (30) and address switching circuit (10) connect a data input signal line (l), data output signal line (m) and address signal line (n), respectively, to the check bit memory cell array (32), enabling the check bit memory cell array (32) to be accessed from the outside.
摘要:
A circuit for generating a boosted signal for a word line, coupled to a word line driving signal line for transmitting a voltage signal to the word line, coupled to a first power supply, and coupled to a second power supply for providing a voltage higher than the voltage of the first power supply, can supply a compensating voltage for the word line from the second power supply through the word line driving signal line when a voltage of the word line is decreased.
摘要:
A dynamic type MOS-RAM constructed of folded type bit lines and having sense operation cycles for amplifying potential difference appearing on respective pairs of bit lines after selection of a word line and restore operation cycles for further amplifying the potential difference on the pairs of bit lines after the sense operation cycles, wherein non-selected word lines are completely brought into electrically floating states in intervals including the sense operation cycles and the restore operation cycles.
摘要:
A semiconductor memory comprises memory cells (15-18, 27-30), a data writing terminal (1), a data readout terminal (48), transistors (3-10, 35-42), address signal input terminals (23-26), subdecode signal input terminals (43-46), driving signal generating circuits (49-52), parallel readout circuits (79-82) and test mode switching signal input terminal (53, 88). In writing of function test data for the memory cells, the driving signal generating circuits turn all of the transistors (3-10) on in response to a test mode switching signal with no regard to address signals, thereby to simultaneously write data in the memory cells (15-18). Further, in readout of the function test data for the memory cells, the parallel readout circuits read the storage contents of the memory cells (27-30) storing the test data in response to a test mode switching signal with no regard to subdecode signals. Logic circuit means (90, 91, 94) may be provided to output logical value corresponding to the test data stored in the memory cells when all of the logical values of the test data are at the same level.