摘要:
A semiconductor device and a computer system, incorporating the same, is capable of capturing an external signal at a high speed and stably operating independent of the duty ratio of a clock signal. An external signal ADD is captured into an address latch 22 by a level latch. The level latch is controlled to a through state at the timing in which the external signal is decided and controlled to a latched state in the decision period of the external signal. A pulse generation circuit controls the timing for switching a latch to the through state to a desired timing by a pulse generation circuit 30 in a chip. According to the above structure, the capture of the external signal ADD can be accelerated because the capture of the signal is determined by the setup timing. Moreover, because a latching period is controlled by the pulse generation circuit in the chip, operations are performed in a stable manner without having to depend upon the pulse width of an external clock CLK.
摘要:
A logic circuit is provided for a memory device which can be operated at a high speed with a lower voltage power source level than conventional devices. This logic circuit can be used in a multi-bit test circuit executing the wired-OR-logic operation of complementary logic signals from a plurality of pre-sense amplifiers, receiving the output of the wired-OR-logic operation by an emitter follower using a bipolar transistor, and outputting an AND signal of the complementary logic signals by a level comparing circuit. A sense amplifier is also provided for executing the wired-OR-logic operation of complementary logic signals from a plurality of pre-sense amplifiers, raising the level of the output of the wired-OR-logic operation by a level shift circuit having a semiconductor element for applying an inverse bias potential to an input signal, executing the wired-OR-operation of the shifted up output and outputs from other blocks, and receiving and amplifying the output of the wired-OR-logic operation.
摘要:
Parasitic capacitances formed between bit lines to which signals are to be read out of memory cells and a signal transmission line arranged above them are to be reduced. Second complementary global bit lines for transmitting data read out of memory cells MC via complementary bit lines are arranged above a memory cell array. Each second global bit line is so arranged that a triangle having as its vertexes the center of the section of one of the complementary bit lines, that of the section of the other and that of the section of the second global bit line arranged directly above these complementary bit lines be an isosceles triangle.
摘要:
There is provided a method of controlling an internal address signal of an RAM in which a late-write method is realized on a chip. Two sets of address registers for reading and writing are provided for each address and further a middle register is provided between the two sets of address registers. The middle register is controlled by a signal formed by obtaining the AND result of a clock signal and a write enable signal and the two sets of address registers for reading and writing are controlled only by the clock signal. A selection circuit selects outputs of the two sets of address registers as an input in accordance with the write enable signal to control an internal address.
摘要:
A semiconductor integrated circuit device is divided into a plurality of blocks, which are individually equipped with signal generate units such that the signal generate units are distributed in the semiconductor integrated circuit device. The semiconductor integrated circuit device is preferably constructed to generate the pulse signal by the pulse generate units which are provided for the individual blocks, after all initial logic operations on the data and control signals have been taken. Thanks to this construction, an SRAM, for example, can have its write recovery time minimized to 0 so that it can achieve high-speed operations. Moreover, since predecoders are provided for the individual blocks, the wiring line number and area in the chip can be reduced to improve the degree of integration of the semiconductor integrated circuit device. Still moreover, signal delay and skew can be reduced in the chip so that high-speed can be achieved. Another feature is that either the input/output pads of the data into or out of the semiconductor integrated circuit device or their accompanying circuit units are distributed in the semiconductor integrated circuit device. The individual features described above can be used solely or in combination, if necessary, to achieve the above-specified objects.
摘要:
A constant current generating circuit is provided with a first current generating circuit unit which generates a first current having a positive temperature dependency and includes a pair of first and second bipolar transistors, a first current mirror circuit comprised of a plurality of first MOS transistors which regulates a current density ratio of the currents fed to the first and second bipolar transistors to be constant and derives the first current and a first circuit disposed between the first and second bipolar transistors and the first current mirror circuit for limiting dependency of the currents flowing through the first and second bipolar transistors on a voltage of a power source applied to the first current mirror circuit, a second current generating circuit unit is also provided which generates a second current having as negative temperature dependency and which includes a third bipolar transistor and a second resistor through which the second current is derived. Also, a summing current generating circuit unit is provided which sums the first current and the second current and generates a constant current with substantially no temperature dependency representing the summed current. This summary current generating circuit unit includes a second current mirror circuit comprised of a plurality of second MOS transistors which generates the constant current representing the summed current.
摘要:
Parasitic capacitances formed between bit lines to which signals are to be read out of memory cells and a signal transmission line arranged above them are to be reduced. Second complementary global bit lines for transmitting data read out of memory cells MC via complementary bit lines are arranged above a memory cell array. Each second global bit line is so arranged that a triangle having as its vertexes the center of the section of one of the complementary bit lines, that of the section of the other and that of the section of the second global bit line arranged directly above these complementary bit lines be an isosceles triangle.
摘要:
An area of a semiconductor chip, on which a memory is disposed, is divided into a plurality of memory blocks and redundant memory blocks, each memory block is divided into a plurality of unit arrays of columns for replacing, each redundant memory block is divided into a plurality of unit arrays of redundant columns, a plurality of memory cells are disposed in each unit array of columns for replacing and each unit array of redundant columns, a memory cell group in each unit array of columns for replacing is connected to a word line and a data line, a redundant memory cell group of each unit array of redundant columns is connected to a redundant word line and a redundant data line, a first data selection circuit for controlling data selection with respect to the unit array of redundant columns is disposed in each memory block, a second data selection circuit for controlling data selecting with respect to the unit array group of redundant columns is disposed in each redundant memory block, and a third data selection circuit for selecting and transmitting only data selected either of the data selection circuit is disposed, wherein, if each memory block has no defect, data selected by the first data selection circuit, that is, data selected from the unit array of columns for replacing of each memory block is transmitted as it is by way of the third data selection circuit, if any one of the memory blocks has a defect, data selection with respect to the unit array of columns for replacing that has encountered the defect is inhibited, the unit array of redundant columns of the redundant memory block is instructed in place of the unit array of columns for replacing that has encountered the defect, and data is, by the second data selection circuit, selected from the selected unit array of redundant columns in place of the replacement unit array that has encountered the defect as to transmit the selected data by way of the third data selection circuit.
摘要:
The invention provides a method of producing a semiconductor device conforming to plural supply voltage specifications without increasing the chip size and the production cost, while the device achieves a high-speed performance. The method includes plural processes for forming plural types of MOS transistors supplied with different power supply voltages in correspondence with external power supply voltages, which are comprised of a first process common to the plural types of MOS transistors, a second process following the first process, which is different by each of the plural types of MOS transistors, and a third process following the second process, which is common to the plural types of MOS transistors.
摘要:
Parasitic capacitances formed between bit lines to which signals are to be read out of memory cells and a signal transmission line arranged above them are to be reduced. Second complementary global bit lines for transmitting data read out of memory cells MC via complementary bit lines are arranged above a memory cell array. Each second global bit line is so arranged that a triangle having as its vertexes the center of the section of one of the complementary bit lines, that of the section of the other and that of the section of the second global bit line arranged directly above these complementary bit lines be an isosceles triangle.