Power-on detector, operating method of power-on detector and memory device including the same
AssigneeSamsung Electronics Co., Ltd.
InventorsMingun Park, Chanho Kim, Sangwon Hwang
Life of this patent
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Abstract
A power-on detector supplied with a power supply voltage from an external source and detects a variation of the power supply voltage. The operating method of the power-on detector comprises calculating the slope of the rise of power supply voltage from a first voltage to a second voltage higher than the first voltage; and calculating the expected time for the power supply voltage to reach a target voltage level, based on the calculated slope.
Claims11
An operating method of a power-on detector supplied with a power supply voltage from an external source and operates in response to a variation of the power supply voltage, the operating method comprising:
- calculating a slope of rise of the power supply voltage;
- and
- calculating the time it will take for the voltage level of the power supply voltage to rise to a target voltage level, based on the calculated slope.
A power-on detector comprising:
- a first voltage detector configured to detect whether the voltage level of a power supply voltage provided from an external source reaches a first voltage;
- a second voltage detector configured to detect whether the voltage level of the power supply voltage reaches a second voltage higher than the first voltage;
- a time counter configured to output a count value;
- and
- a calculator configured to calculate the slope of the power supply voltage based on the first voltage, the second voltage, and the count value output by the counter when the voltage level of the power supply voltage reaches the second voltage from the first voltage.
A memory device comprising:
- a memory cell array;
- a read/write circuit configured to access the memory cell array;
- and
- a power supply circuit configured to power the memory cell array and the read/write circuit,
- wherein the power supply circuit calculates the slope of rise of a power supply voltage provided from an external source, calculates the time taken for the power supply voltage to reach a target voltage level based on the calculated slope, and generates a control signal when the calculated time elapses.
Dependencies are inferred from the claim text.