摘要:
FLASH memory device contains at least one memory stack. The stack of transistors includes a first (or source) selector transistor, a second (or drain) selector transistor, and a plurality memory cell transistors connected in series therebetween. During an erase operation, each of the first and second selector transistors has a bias applied that releases the select transistors from an electrically floating state together with biasing each of the memory cell transistors.
摘要:
A contact structure for a PCM device is formed by an elongated formation having a longitudinal extension parallel to the upper surface of the body and an end face extending in a vertical plane. The end face is in contact with a bottom portion of an active region of chalcogenic material so that the dimensions of the contact area defined by the end face are determined by the thickness of the elongated formation and by the width thereof.
摘要:
A method is provided for transferring data in a memory that includes memory cells forming memory pages, and a page buffer that includes a register, with signal lines selectively transferring data stored in the register to the memory cells of a selected one of the memory pages and an output interface of the memory. Data read from or to be written to the memory cells of the selected one of the memory pages is at least temporarily stored in the register, and outputs of the register are buffered so as to decouple the outputs of the register from the signal lines. The signal lines include bitlines that are each coupled to some of the memory cells and data lines that are coupled to the output interface of the memory. The buffering comprises selectively driving the bitlines or the data lines according to a data word that is stored in the register.
摘要:
A method is provided for transferring data in a memory that includes memory cells forming memory pages, and a page buffer that includes a register, with signal lines selectively transferring data stored in the register to the memory cells of a selected one of the memory pages and an output interface of the memory. Data read from or to be written to the memory cells of the selected one of the memory pages is at least temporarily stored in the register, and outputs of the register are buffered so as to decouple the outputs of the register from the signal lines. The signal lines include bitlines that are each coupled to some of the memory cells and data lines that are coupled to the output interface of the memory. The buffering comprises selectively driving the bitlines or the data lines according to a data word that is stored in the register.
摘要:
A contact structure for a PCM device is formed by an elongated formation having a longitudinal extension parallel to the upper surface of the body and an end face extending in a vertical plane. The end face is in contact with a bottom portion of an active region of chalcogenic material so that the dimensions of the contact area defined by the end face are determined by the thickness of the elongated formation and by the width thereof.
摘要:
An electronic memory device with a high density of non-volatile memory cells has a reduced capacitance cell-to-cell interference. The memory cells are integrated on a semiconductor substrate and are organized in a matrix of cells with word lines and bit lines connected to the cells. Each memory cell includes at least one floating gate transistor having a floating gate region projecting from the substrate, and a control gate region capacitively coupled to the floating gate region. Between the cells of opposite word lines, a lateral coating is provided that includes at least one conductive layer floating along the direction of the bit lines.
摘要:
A phase change memory has an array formed by a plurality of cells, each including a memory element of calcogenic material and a selection element connected in series to the memory element; a plurality of address lines connected to the cells; a write stage and a reading stage connected to the array. The write stage is formed by current generators, which supply preset currents to the selected cells so as to modify the resistance of the memory element. Reading takes place in voltage, by appropriately biasing the selected cell and comparing the current flowing therein with a reference value.
摘要:
A circuit for converting a direct current input voltage into an output voltage greater than the input voltage. The circuit includes a charge pump and a block for generating pulse signals of a predetermined frequency to be applied to a control input of the charge pump. The settling time, i.e. the time necessary for the output voltage to attain its operating value and to maintain it with a given precision, is reduced by providing the circuit with charge injection control via modulation of the duty cycle of the pulse signals as a function of the difference between the output voltage, or a predetermined fraction thereof, and a predetermined reference voltage and in such a manner as to reduce the settling time as the difference diminishes. The circuit includes a regulator that controls the charge pump based upon the predetermined reference voltage.
摘要:
The voltage generator comprises a negative feedback loop including a programmable voltage divider having a feedback node. The voltage divider comprises a programmable resistor disposed between the output of the voltage generator and the feedback node and having variable resistance. The programmable resistor includes a fixed resistor and a plurality of additional resistors arranged in series with each other and defining a plurality of intermediate nodes. The additional resistors may be selectively connected by means of switches disposed between the output of the voltage generator and a respective intermediate node so as to define an output voltage V0 programmable on the basis of command signals supplied to the switches.
摘要:
The memory device comprises a memory array having an organization of the type comprising global word lines and local word lines, a global row decoder addressing the global word lines, a local row decoder addressing the local word lines, a global power supply stage supplying the global row decoder, and a local power supply stage supplying the local row decoder.