Patent ID: 9691469
Date: 2017-06-27
CPC Classifications: G11C

Claim:
1. A semiconductor memory device comprising: an oscillating signal generation section suitable for generating an oscillation signal oscillating with a period, which is defined by a predetermined temperature-period function; a period control section suitable for controlling the period of the oscillation signal according to a combined temperature-period function which is combined two or more predetermined temperature-period functions, which are different from one another, in response to a refresh characteristic information; and a memory cell array suitable for performing a refresh operation in response to the oscillation signal, wherein the combination of two or more predetermined temperature-period functions has two or more temperature sections defined by the function transition points, wherein the combined temperature-period function has each of the two or more temperature-period functions including a first function and a second function, which are different from one another, in each of the temperature sections, wherein the combined temperature-period function corresponds to the first function before a function transition point, and corresponds to the second function after the function transition point, wherein the period control section comprises a plurality of discharge units, wherein each of the discharge units includes a diode and a transistor for electrically coupling to the oscillating signal generation section for defining the slopes of the first function and the second function.