Abstract:
A MOS dynamic type RAM comprises memory cells (10), dummy cells (11), bit line pairs (BL, BL), word lines (WL), dummy word lines (DWL) and sense amplifiers (12). In a non-active cycle, the potentials of each pair of bit lines (BL, BL) are precharged at 1/2 of a supply potential V.sub.CC. Each sense amplifier (12) operates in an active cycle following the non-active cycle, while each active pull-up circuit (13) pulls up the potential of a higher level one of the pair of bit lines to V.sub.CC. This active cycle is defined by an internal RAS internal signal, which is generated by a NAND circuit (27) in response to an external RAS signal and an RPW signal obtained by delaying the external RAS signal by a delay circuit (20) and having a trailing edge obtained by delaying the trailing edge of the external RAS signal by a prescribed period.
Abstract:
An input signal is inverted by a CMOS inverter and provided for an output signal line. The CMOS inverter is provided between a power supply and a ground, and its node on the side of the power supply is charged all the time to prevent the potential thereof from being lowered. An output signal provided for the output signal line is delayed by a delay circuit to be applied to a boosting capacitor. The potential of the node is further boosted by this boosting capacitor. Consequently, the potential of the output signal is also boosted. When the potential of the node is raised higher than a supply voltage, an N channel MOSFET for charging is turned off to prevent a reverse flow of a charge.
Abstract:
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.
Abstract:
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.
Abstract:
A dynamic RAM has dummy capacitors (C6, C7) having the same capacitance as a memory capacitor connected to a pair of bit lines (BL1, BL1), respectively. During an active period, respective dummy capacitors (C6, C7) are charged to the H level and L level, which are signal levels of the bit lines (BL1, BL1) and during precharge period, both dummy capacitors are equalized. Since both dummy capacitors (C6, C7) respectively connected to a pair of bit lines (BL1, BL1) are equalized during precharge period, so that the stored charge values of the dummy capacitors (C6, C7) both become the intermediate value of the ground level and supply potential level.