摘要:
In a semiconductor integrated circuit device that includes macro cells (circuit blocks that can be designed independently) such as a storage circuit and operates synchronously with an external clock, total delay time from signal input to output is reduced and the speed of operation is increased. In the semiconductor integrated circuit device which has plural circuit blocks coupled in series for signal transmission and whose whole operation is controlled by a clock signal, the semiconductor integrated circuit device including first circuit blocks that receive input signals in response to a first timing signal based on a clock signal, and a second circuit block that forms output signals in response to a second timing signal based on the clock signal, a time difference between the first timing signal and the second timing signal is set to a non-integral multiple of the cycle of the clock signal.
摘要:
In a semiconductor integrated circuit device that includes macro cells (circuit blocks that can be designed independently) such as a storage circuit and operates synchronously with an external clock, total delay time from signal input to output is reduced and the speed of operation is increased. In the semiconductor integrated circuit device which has plural circuit blocks coupled in series for signal transmission and whose whole operation is controlled by a clock signal, the semiconductor integrated circuit device including first circuit blocks that receive input signals in response to a first timing signal based on a clock signal, and a second circuit block that forms output signals in response to a second timing signal based on the clock signal, a time difference between the first timing signal and the second timing signal is set to a non-integral multiple of the cycle of the clock signal.
摘要:
An information processing system having an original clock oscillator for delivering at least one original clock signal K defined as a first clock signal and a plurality of information processing units supplied with the original clock signal K, wherein each information processing unit comprises clock generating means for generating at least one second clock signal K.sub.1 which is phase-locked with the original clock signal K and which has a predetermined duty cycle and a logic device whose operation timing is controlled by the second clock signal K.sub.1, and the operation timing of an interface provided between at least one pair of logic devices is synchronously controlled by the clock signal K.sub.1.
摘要:
A semiconductor apparatus including built-in power supply circuits capable of supplying a large current with high voltage accuracy. The semiconductor apparatus includes a semiconductor chip including a circuit area and power supply circuits, coils and capacitors. The semiconductor chip, coils and capacitors are provided in a package. Each power supply circuit, a coil and a capacitor compose a switching regulator. The semiconductor chip and the package are connected such that a power supply voltage which will be produced by the switching regulator is supplied to the circuit area. The power supply circuit is supplied with a power supply voltage from the outside of the semiconductor apparatus.
摘要:
An information processing system having an original clock oscillator for delivering at least one original clock signal K defined as a first clock signal and a plurality of information processing units supplied with the original clock signal K, wherein each information processing unit comprises clock generating means for generating at least one second clock signal K1 which is phase-locked with the original clock signal K and which has a predetermined duty cycle and a logic device whose operation timing is controlled by the second clock signal K1, And the operation timing of an interface provided between at least one pair oflogic devices is synchronously controlled by the clock signal K1.
摘要:
A PLL circuit includes a phase comparator which makes a comparison between an internal clock signal and a clock signal supplied from an external terminal, a charge pump circuit which produces a charging-up or discharging current in accordance with the output of the phase comparator, so as to drive a filter capacitor, a voltage-controlled oscillator the oscillation frequency of which is controlled by the held voltage of the filter capacitor, and a frequency divider circuit which generates the internal clock signal on the basis of the oscillation output of the voltage-controlled oscillator. The PLL circuit is additionally provided with a voltage detector circuit which detects whether the held voltage of the filter capacitor has been raised to a predetermined voltage or higher, and the function of forcibly lowering the held voltage of the filter capacitor down to a predetermined potential in accordance with the detection output of the voltage detector circuit. Besides, a system is provided with a detection and setting circuit which detects a state brought about by the electrical disconnection of the feedback loop of the PLL circuit, and which brings the PLL circuit into a predetermined state.
摘要:
A unidirectional switching circuit having no charge storage effect for performing a high-speed switching operation is disclosed in which one of the anode and cathode terminals of a Schottky-barrier diode is connected to one of the source and drain terminals of a field effect transistor to form the series combination of the Schottky-barrier diode and the field effect transistor, that one of end terminals of the series combination which exists on the anode side of the diode, is used as an input terminal, the other end terminal existing on the cathode side is used as an output terminal, the gate electrode of the field effect transistor is used as a switching control electrode, and a current flowing through the switching circuit in a direction from the input terminal to the output terminal is controlled in accordance with a signal applied to the switching control electrode.
摘要:
An electric current flowing to an upper side power MOSFET during soft-start is detected according to an on-voltage of the MOSFET and an on-pulse width of a PWM pulse for driving the upper side power MOSFET is forced to be reset in the idle and decided according to a signal generated when the voltage falls below a predetermined specified voltage.
摘要:
A semiconductor integrated circuit device having a plurality of logic circuits integrated on a semiconductor substrate is provided which can operate with a power source potential difference substantially less than 5 V. The logic circuit includes a bipolar transistor having a base and its collector-emitter current path coupled between a first power source terminal and an output terminal, together with at least one field effect transistor having its gate responsive to an input signal applied to an input terminal and its source-drain current path coupled between the first power source terminal and the base of the bipolar transistor. A semiconductor switch means is also provided which is responsive to the input signal applied to the input terminal for performing ON/OFF operations complementary to the ON/OFF operations of the bipolar transistor and which has a current path between its paired main terminals coupled between the output terminal and the second power source terminal. In order to improve the operating speed, a potential difference reducing element is provided having a current path between its paired main terminals coupled between the first power source terminal and the output terminal for reducing the potential difference, which is present between the first power source terminal and the output terminal based on the base-emitter forward voltage of the bipolar transistor when the bipolar transistor is ON.
摘要:
An information processing system having an original clock oscillator for delivering at least one original clock signal K defined as a first clock signal and a plurality of information processing units supplied with the original clock signal K, wherein each information processing unit comprises clock generating means for generating at least one second clock signal K.sub.1 which is phase-locked with the original clock signal K and which has a predetermined duty cycle and a logic device whose operation timing is controlled by the second clock signal K.sub.1, and the operation timing of an interface provided between at least one pair of logic devices is synchronously controlled by the clock signal K.sub.1.