Refresh period signal generator with digital temperature information generation function

A refresh period signal generator with a digital temperature information generation function, comprising:

• a first period signal generating part that generates a first period signal having a period varying according to a temperature;
• a second period signal generating part that generates a second period signal having a predetermined period regardless of the temperature;
• a dividing part that outputs first to fourth dividing period signals by dividing the first period signal and the second period signal at a plurality of predetermined dividing ratios;
• a temperature information generating part that generates temperature information by using the first dividing period signal and the second period signal;
• a refresh period signal generating part that outputs a refresh period signal by selecting one signal having a shorter period between the third dividing period signal and the fourth dividing period signal;
• and
• an operation timing control part that operates the temperature information generating part and the refresh period signal generating part at different timings.