Lapis Semiconductor Co., Ltd.

Junya Ogawa

Katsuaki Matsui

A semiconductor device outputs, as an output signal synchronized to a phase-locked loop clock signal, a synchronized input signal that is synchronized to a reference clock signal of a phase-locked loop circuit. The semiconductor device includes the phase-locked loop circuit, a first flip-flop that receives the input signal in synchronization with the reference clock signal on the basis of a feedback signal inputted to a phase comparator of the phase-locked loop circuit, and a second flip-flop that receives an output from the first flip-flop on the basis of the phase-locked loop clock signal. The second flip-flop outputs the output from the first flip-flop as the output signal. A setup time to synchronize the input signal to the phase-locked loop clock signal is set to one half of a period of the reference clock signal.

Semiconductor device

Provided is a semiconductor device including a regulator that generates a first voltage and applying the first voltage to a first line; an external terminal that is connected to the first line and externally connects an external component; and a test circuit that inspects a connection state of the external component. The test circuit includes a test discharge execution unit that is configured, upon receiving a test start signal, to stop the operation of the regulator and discharge the external component by connecting the first line to a predetermined potential; and a discharge duration measurement unit that measures a time required from the reception of the test start signal to a drop of the voltage of the first line below a predetermined second voltage, as a discharge duration of the component, and generate discharge duration information about the discharge duration.

Semiconductor device and electronic device

A voltage supply circuit includes a step-down circuit configured to receive a power supply voltage, step down the power supply voltage to generate a step-down voltage having a constant value lower than a value of the power supply voltage, and a booster circuit configured to boost the step-down voltage to generate an output voltage, the output voltage having a value greater than the value of the power supply voltage.

Voltage supply circuit and semiconductor storage device

A nonvolatile semiconductor memory quickly and precisely accumulates a desired amount of charges corresponding to data-to-be-written in a charge accumulating part of a memory cell. When charges are injected into the charge accumulating part of the memory cell by applying a writing voltage corresponding to the data-to-be-written to the drain or source region of the memory cell, the writing voltage is reduced on the basis of an increase in the amount of charges accumulated in the charge accumulating part.

Growing community of inventors

Yokohama, Japan

Junya Ogawa