摘要:
A plurality of substrate bias circuits (14, 16, and 18) are designed to provide a stable substrate reference potential for a variety of operating modes. Only one of the bias circuits is enabled by a control circuit (12) at any time for any operational mode. An on-demand boost bias circuit (16) is enabled whenever a level detector (20) indicates substrate bias has exceeded a predetermined limit during special operating modes such as burn-in or parallel test.
摘要:
A circuit is designed with a decoder circuit (10), responsive to a first input signal (81) having a first voltage range, for producing a first output signal. An output circuit (11), responsive to the first output signal, produces a second output signal (26) having a second voltage range. The second voltage range includes a voltage less than a least voltage of the first voltage range and a voltage greater than a greatest voltage of the first voltage range.
摘要:
A circuit is designed with a decoder circuit (10), responsive to a first input signal (81) having a first voltage range, for producing a first output signal. An output circuit (11), responsive to the first output signal, produces a second output signal (26) having a second voltage range. The second voltage range includes a voltage less than a least voltage of the first voltage range and a voltage greater than a greatest voltage of the first voltage range.
摘要:
In memory devices, and particularly in dynamic random access memory devices that use boosted word lines, voltage leakage in word lines and transfer gates to memory cells cause data error. A circuit, device, and method to detect voltage leakage is disclosed. The test circuit includes a sample and hold circuit that is connected to the word line of an addressed memory cell to store the voltage level on the word lines as it charges. A comparator is connected to compare the stored voltage level with the voltage level on the word line after it is charged and to indicate if the voltage level of the word line falls below a predetermined amount. The circuit can detect a voltage differential as small as 50 millivolts for a high resistance short as large as 2 megaohms in about 200 nanoseconds. The circuit can be incorporated into a random access memory device thereby significantly increasing the speed at which all memory cells and word lines can be tested. The method disclosesd a process for testing word line to memory cell leakage.
摘要:
A fuse circuit as used in self-repairing memory devices or the like employs a CMOS inverter and a feedback transistor to provide zero static or standby current. The fuse is in series with the feedback transistor across the supply, and the CMOS inverter has as its input the node between the fuse and feedback transistor. The inverter output controls the gate of the feedback transistor, which is N-channel or P-channel, depending upon whether the circuit is connected for high or low voltage output.
摘要:
A CMOS bistable circuit is employed as an address buffer or latch for a semiconductor memory or the like. The circuit includes a pair of differential gated inputs, one from an address terminal, and the other from a reference voltage. The same clock used to gate the inputs also preconditions the circuit to be in a balanced status, and holds off conduction of any transistor in the circuit. In this manner, a circuit of high speed, low power, and minimum complexity is provided.
摘要:
A random access read/write MOS memory device employs an array of rows and columns of dynamic memory cells which are accessed by multiplexed row and column addresses latched in by row address strobe and column address strobe signals. For refresh operations, only the row address is needed, so no column address strobe occurs. During long periods of refresh-only operations, deterioration of internal clocks based on the column address strobe signal is avoided by boosting these clocks from the row address strobe signal.
摘要:
Methods and ferroelectric devices are presented, in which pulses are selectively applied to ferroelectric memory cell wordlines to discharge cell storage node disturbances while the cell plateline and the associated bitline are held at substantially the same voltage.
摘要:
Methods (200) and systems (108) are provided for reading data from ferroelectric memory cells (106) in which charge is removed from a sense amp input (SABL/SABLB) prior to application of a plateline signal (PL) to the target cell capacitor (CFE). Where the sense amp input (SABL/SABLB) is initially precharged to zero volts, the extraction of charge provides a negative voltage on the data bitline (BL/BLB) when the plateline signal (PL) is applied, allowing adequate voltage to be applied across the cell capacitor (CFE) together with reduced plateline voltages (PL).
摘要:
A semiconductor memory device includes an array of storage cells, each cell having a transfer transistor with a gate electrode. A separate wordline 32 interconnects the gate electrodes of each row of the storage cells. A first conductive layer includes stripes 38, each stripe overlying a different row of the storage cells and connecting to the wordline and the gate electrodes of the storage cells of a different odd numbered row of the storage cells. An insulator surrounds the stripes of the first conductive layer. A second conductive layer, separated from the stripes of the first conductive layer by the insulator, includes stripes 39, each stripe of the second conductive layer overlying a different even numbered row of storage cells and connecting to the wordline and the gate electrodes of the different even numbered row of storage cells. This arrangement reduces parasitic delay caused by the wordlines in a high density memory and increases the minimum pitch between stripes of any one level of conductor layer.