Patent ID: 7610165

Claim:
A semiconductor memory device, comprising: a temperature information output unit configured to measure an internal temperature of the semiconductor memory device, and to generate a plurality of flag signals each having a voltage level varying based on the measured internal temperature; a self-refresh oscillation unit configured to provide a self-refresh period corresponding to the measured internal temperature in response to the plurality of flag signals outputted from the temperature information output unit; and a temperature information control unit configured to determine a measuring period of the temperature information output unit in response to a temperature sensing enable signal and the plurality of flag signals, wherein the temperature information control unit includes: a period signal generating unit configured to generate an initial period signal, and a plurality of additional period signals each having a different period in response to the temperature sensing enable signal; and a period signal selection unit configured to select, for determining the measuring period, one of the initial periodsignal and the plurality of additional period signals in response to the plurality of flag signals.