DEVICE FOR CONTROLLING PERIOD OF SELF REFRESH

摘要

PURPOSE: A device for controlling period of self refresh is provided to reduce a self refresh current by controlling a self refresh period. CONSTITUTION: A device for controlling period of self refresh comprises a temperature detector(30) detecting an operating temperature of a semiconductor element together entering a self refresh mode, and a self refresh period controller(60) controlling a present self refresh period in accordance with a signal from the temperature detector. The temperature detector comprises a delay part(10) having a constant delay time, a variable delay part(15) having a variable delay time, and a signal composite part(20) compositing signals from the delay part and the variable delay part.