摘要:
Provided is a semiconductor memory device including: multiple bit lines arranged in parallel to one another; multiple sense-amplifier bit lines arranged away from end portions of the bit lines; a fourth sense-amplifier bit line formed with a wire of a first layer arranged below the bit lines; selection transistors with a pair of gate electrodes arranged in a direction normal to the first to sixth bit lines; a first wire arranged below the bit lines and the sense-amplifier bit lines, and having an end portion extending to below the third bit line and connected to the bit line; a third wire formed with a layer of the gate electrode used as a wire, the third wire including a first end portion positioned below the fourth sense-amplifier bit line and connected to the fourth sense-amplifier bit line, and a second end portion positioned below the second sense-amplifier bit line; and a fourth wire formed with a wire of the first layer and arranged between the third wire and the second sense-amplifier bit line to connect the third wire to the second sense-amplifier bit line.
摘要:
According to one embodiment, a semiconductor memory device includes a memory cell array includes memory cells, lines provided to correspond to the memory cells, a first decoder configured to select a first line as an inspection target from the lines, a second decoder configured to select a second line for generating a reference voltage from the lines, a driver configured to charge the first and second lines, a discharging circuit configured to simultaneously discharge the first and second lines, and a sense amplifier configured to compare a voltage of the first line with a voltage of the second line to detect a defect of the first line while the first line is discharged.
摘要:
A reference voltage generating circuit receives a power supply voltage and generates a reference voltage. A reference voltage level guarantee circuit generates a sense signal when the circuit senses that a value of the reference voltage has reached a predetermined value. A power supply voltage sensing circuit has a voltage comparator circuit which compares a voltage obtained by dividing a power supply voltage with the reference voltage and outputs a power ON reset signal. An operation of the voltage comparator circuit is controlled based on a sense signal. When the value of the power supply voltage increases and the value of the reference voltage reaches a predetermined value, the voltage comparator circuit operates, and a power ON reset signal is outputted in response to a result of comparison between a divisional voltage and the reference voltage.
摘要:
A semiconductor memory device includes memory cell arrays, word lines, bit lines, column gates, sense amplifiers, and an error correcting circuit. The memory cell array includes first regions and a second region. The first region includes first element isolating regions which have stripe shapes along the bit lines. The memory cell is formed on an element region between the adjacent element isolating regions. The first regions are arranged in plurality along the word line direction. The second region is provided adjacent to the first region in a direction along the word lines. The second region includes a second element isolating region whose width along the word line direction is greater than that of the first element isolating region. Addresses of the bit line adjacent to the second region are different from one another among the memory cell arrays.
摘要:
A semiconductor device of this invention includes a first circuit for initializing a predetermined circuit in accordance with the level of a power source voltage, a second circuit for controlling the output from the first circuit by activation or deactivation, and an activation control circuit for activating or deactivating the second circuit in accordance with external input.
摘要:
A semiconductor device of this invention includes an initialization circuit for initializing a predetermined circuit in accordance with the level of a power source voltage, and a status setting unit for setting the status. of the semiconductor device to “busy” during a period in which the initialization circuit performs initialization.
摘要:
A reference voltage generating circuit receives a power supply voltage and generates a reference voltage. A reference voltage level guarantee circuit generates a sense signal when the circuit senses that a value of the reference voltage has reached a predetermined value. A power supply voltage sensing circuit has a voltage comparator circuit which compares a voltage obtained by dividing a power supply voltage with the reference voltage and outputs a power ON reset signal. An operation of the voltage comparator circuit is controlled based on a sense signal. When the value of the power supply voltage increases and the value of the reference voltage reaches a predetermined value, the voltage comparator circuit operates, and a power ON reset signal is outputted in response to a result of comparison between a divisional voltage and the reference voltage.
摘要:
A semiconductor memory device includes a row address transition detector. The semiconductor memory device remedies a fault by replacing a column in a memory cell array with a redundancy bit line. The row address transition detector detects a change in a row address signal for selecting the row direction of the memory cell array. Only when a change in the row address signal is detected by the row address transition detector, the redundancy bit line is sensed.
摘要:
A semiconductor device of this invention includes an initialization circuit for initializing a predetermined circuit in accordance with the level of a power source voltage, and a status setting unit for setting the status of the semiconductor device to “busy” during a period in which the initialization circuit performs initialization.
摘要:
A semiconductor device of this invention includes an initialization circuit for initializing a predetermined circuit in accordance with the level of a power source voltage, and a status setting unit for setting the status of the semiconductor device to “busy” during a period in which the initialization circuit performs initialization.