摘要:
When an operation of an internal circuit is initiated, a current is supplied from an external power supply node to a sub-power source line for a predetermined period. A semiconductor device having a hierarchical power source structure is provided, which can have a voltage variation in the sub-power source line reduced and which can recover the varied voltage speedily to a predetermined voltage level in an operating state of the internal circuit.
摘要:
The level converting circuit includes a first current cutting circuit, a second current cutting circuit, a level shift circuit and an inverter. The first current cutting circuit includes two PMOS transistors connected to a node having a boosted potential Vpp. The second current cutting circuit includes two NMOS transistor connected to a ground node. The level shift circuits include two PMOS transistors and two NMOS transistors. Before a through current flows between the node having the boosted potential Vpp and the ground node, any of the transistor included in the first current cutting circuit and any of the transistors included in the second current cutting circuits are turned off. Therefore, through current between the node having the boosted potential Vbb and the ground node can be prevented.
摘要:
Semiconductor device according to the present invention includes package frame, bonding wire, pad, first internal power supply line, second internal power supply line, internal circuit, stabilize circuit, GND package frame, GND bonding wire, GND pad, and internal GND line. Bonding wire, pad, and first and second internal power supply lines function as a filter. As a result, noise generated by operation of the internal circuit is absorbed in propagating to the stabilize circuit through first internal power supply line, pad, and the second internal power supply line. Therefore, effects of noise given to the stabilize circuit are small.
摘要:
Respective ones of a plurality of memory array blocks are rendered drivable independently of each other under control of an array activation control circuit. When data is read from one array block under control of the array activation control circuit, the data can be transferred to another array block by selecting and coupling a column in the other array block to a global I/O bus.
摘要:
A tester is connected to a signal output terminal provided in a DRAM chip, and a frequency of a clock signal output from an internal timer is monitored. The frequency of the clock signal is varied by changing the combination of 3 bit signals, so as to obtain signals by which the frequency closest to the set value is obtained. A fuse in the internal timer is disconnected to set the frequency of the clock signal so as to obtain the same state as in the case where that signal is applied.
摘要:
A main source voltage transmission line for transmitting a source voltage VCH as one power source and a sub source voltage transmission line are provided corresponding to a gate circuit. A resistive element having a high resistance is provided between the main source voltage transmission line and the sub source voltage transmission line. A capacitor comprised of an insulated gate field effect transistor is connected to the sub source voltage transmission line. The gate circuit is operated with a voltage on the sub source voltage transmission line as an operating source voltage. Thus, the voltage on the sub source voltage transmission line can be maintained at a voltage level that balances with a sub-threshold current flowing through the gate circuit, and the voltage on the sub source line can be stably maintained by the capacitor. A semiconductor memory device can be realized which reduces the sub-threshold current that flows upon standby of the gate circuit and minimizes a difference in voltage between the sub source voltage transmission line and the main source voltage transmission line to operate at high speed with low current consumption.
摘要:
For each memory block, a predecoder for predecoding an applied address signal, an address latch circuit for latching the output signal of the predecoder, and a decode circuit for decoding an output signal of the address latch circuit and performing a memory cell selecting operation in a corresponding memory block are provided. Propagation delay of latch predecode signals can be made smaller and the margin for the internal read timing can be enlarged. In addition, the internal state of the decoder and memory cell selection circuitry are reset to an initial state when a memory cell is selected and the internal data output circuitry is reset to an initial state in accordance with a state of internal data reading. Thus, a non-volatile semiconductor memory device that can decrease address skew and realize an operation with sufficient margin is provided.
摘要:
In an exclusive OR circuit (XOR gate) constituting an ECC circuit, the drivability of P channel MOS transistors is set larger than the drivability of N channel MOS transistors. Accordingly, the speed of the logic level of an output node being set to an H level from an L level identified as a reset state is increased than the case where the drivability is set equal. Thus, the time required to output a syndrome from a plurality of stages of XOR gates can be reduced to allow execution of error correction processing at high speed.
摘要:
In a memory cell array of an MRAM, a normal memory cell is compared with a reference memory cell which holds a reference value, thereby storing data of one bit per cell. Two spare memory cells store data of one bit as a whole. By writing complementary values to the two spare memory cells and connecting these spare memory cells to a sense amplifier, the stored data of one bit is read. A spare memory cell section which is often arranged in an array peripheral portion becomes more resistant against a variation in finished dimensions of elements and a success rate for replacing and relieving a defective memory cell by a spare memory cell increases.
摘要:
Dummy cells are disposed in alignment with memory cells arranged in rows and columns in a memory array. The memory cell includes a variable resistance element and a select transistor having a collector connected to a substrate region and selecting the variable resistance element in response to a row select signal. Corresponding to a row of memory cells, there is provided a word line connecting to memory cells on corresponding row and transmitting the row select signal, and a word line shunting line electrically connected at predetermined intervals to each word line. Moreover, corresponding to a row of dummy cells and a column of dummy cells, there is provided substrate shunt lines electrically connected to the substrate region. The voltage distribution in the substrate region is eliminated to achieve stable operating characteristics of the memory cell transistor. In addition, a word line is driven at high speed by a word line shunt structure.