摘要:
A semiconductor integrated circuit includes a semiconductor chip having a plurality of pad electrodes fixed in a lead frame. Electrical leads connected to the chip include outer lead portions, external to the lead frame, and inner lead portions, internal to the lead frame and electrically connected to the semiconductor chip. At least one lead is a dummy lead, providing additional space in the lead frame. Due to the extra space, the inner lead portions may have various shapes, including large leads, or branched leads, for elimination power noise.
摘要:
In an electrically erasable non-volatile semiconductor memory device, a plurality of non-volatile semiconductor memory cells are arranged in a matrix form and are connected to corresponding ones of row and column lines. In a data writing mode, a first voltage Vp at is applied to the column lines so that the drains of the memory cells are maintained at a drain potential, and a second voltage is applied to the row lines so that a sum level of the drain potential and the threshold voltage of the memory cell is not smaller than the floating gate potential of the memory cell.
摘要:
A semiconductor integrated circuit includes a CMOS circuit operated on a voltage of a first voltage level to set an output node thereof to a voltage of the first voltage level or a reference voltage; an output circuit for controlling supply of a voltage of a second voltage level which is higher than the first voltage level to a signal output node; and an isolation MOS transistor having a current path connected between the output node of the CMOS circuit and the signal output node and a gate connected to receive a control signal. The output node of the CMOS circuit is set to the reference voltage with the conduction resistance of the isolation MOS transistor kept high after the lapse of period in which the voltage of the second voltage level is kept supplied to the signal output node. After this, the conduction resistance of the isolation MOS transistor is reduced in response to the control signal.
摘要:
A semiconductor memory circuit includes a plurality of semiconductor memory areas, a plurality of data lines connected to the memory areas for the transfer of data with respect thereto, a plurality of word lines for transmitting access signals to the memory areas, a column decoder connected to the plurality of data lines and a row decoder having decoding sections respectively connected to the memory areas and switching MOS transistors connected between the decoder sections and a voltage supply terminal. The memory circuit further includes a memory selection circuit connected to the switching MOS transistors of said row decoders for controlling the conduction state of the switching MOS transistors.
摘要:
A semiconductor memory circuit includes a plurality of semiconductor memory areas, a plurality of data lines connected to the memory areas for the transfer of data with respect thereto, a plurality of word lines for transmitting access signals to the memory areas, a column decoder connected to the plurality of data lines and a row decoder having decoding sections respectively connected to the memory areas and switching MOS transistors connected between the decoder sections and a voltage supply terminal. The memory circuit further includes a memory selection circuit connected to the switching MOS transistors of the row decoders for controlling the conduction state of the switching MOS transistors.
摘要:
A memory cell array is formed of a plurality of nonvolatile memory cell transistors arranged in a matrix form. The patterns of the control gate electrode and the source region of each memory cell transistor are formed in parallel and the pattern of the erasing gate electrode is formed to intersect the source region and control gate electrode patterns. A field oxide film is formed in an intersecting portion between the source region and the erasing gate electrode.
摘要:
In a nonvolatile semiconductor memory device, a wiring layer is connected between a power source and a memory cell. Resistance of the wiring layer is larger than the on-resistance of a load transistor, so that the load transistor substantially determines the load characteristic. Therefore, the load characteristic curve is more gentle in inclination and more rectilinear in shape. This makes the data writing operation stable against a variance in the channel lengths of manufactured transistors forming the memory cells.
摘要:
A semiconductor memory device in which data can be read out in response to an address signal comprises power source lines, a plurality of row and column conductive lines, a memory cell array including nonvolatile memory cells arranged in a matrix form of rows and columns and respectively connected to the plurality of row and column lines and the power source lines, a first selector circuit for generating a signal for selecting the row conductive lines in response to an address signal, a dummy row line, and a dummy memory cells each having a source, a drain and a control gate connected to the dummy row line. In the semiconductor memory device, one of paths between the source and the power source line and between the drain and the corresponding row line is closed and the other path is opened, and it further includes a second selector circuit for selectively generating a line selection signal for selecting one of the row conductive lines in response to an address signal and a dummy selection signal for selecting the dummy row line in response to the same address signal.
摘要:
A sub-booster circuit for further stepping up an output voltage of a main booster circuit includes a first MOS transistor having a drain connected to the output terminal of the main booster circuit, and a gate connected to an input terminal of an object circuit, a second MOS transistor having a drain and a gate connected to the source of the first MOS transistor and a source connected to the input terminal of the object circuit, and a MOS capacitor having a first electrode connected to a connection node between the first and second MOS transistors and a second electrode connected to receive a clock pulse signal. A threshold voltage of the second MOS transistor is set to be larger in its absolute value than a threshold voltage of the first MOS transistor and the MOS capacitor has substantially the same threshold voltage as that of the second MOS transistor.
摘要:
A nonvolatile semiconductor memory device includes a pulse signal generator for applying a pulse signal to a capacitor, a first diode connected at an anode to the capacitor, a charging circuit for charging the capacitor in a programming mode, a voltage limiter for preventing a potential at the output node from increasing above a predetermined level, memory cells of nonvolatile MOS transistors, a load MOS transistor connected to a high-voltage terminal, a row decoder for selecting a set of memory cells arranged in one row, column gate MOS transistors connected between respective sets of memory cells arranged in one column and the load MOS transistor, a data generator responsive to the voltage at the output node to turn on or off the load MOS transistor, and a column decoder responsive to the voltage at the output node to selectively energize the column gate MOS transistors. It further comprises a second diode connected between the cathode of the first diode and the output node, and a discharging circuit for discharging the cathode of the first diode to a reference voltage level during a time other than a programming mode.