Patent ID: 8089180
Filing Date: 2012-01-03
Classification: H01L

Abstract:
1. An integrated circuit device comprising: a startup operation circuit for carrying out processing necessary for startup; and a post-startup operation circuit for carrying out a main operation after completion of the processing necessary for startup, wherein the post-startup operation circuit has a first operation guaranteed temperature range whose lower limit is higher than a lower limit of a second operation guaranteed temperature range of the startup operation circuit, the post-startup operation circuit operates when a temperature of the post-startup operation circuit is equal to or lower than a threshold temperature, which is the lower limit of the first operation guaranteed temperature range, to increase the temperature of the integrated circuit device, and starts the main operation after the temperature of the integrated circuit device exceeds the threshold temperature, if the temperature of the post-startup operation circuit is lower than the threshold temperature, the startup operation circuit starts an initializing process necessary for the main operation of the post-startup operation circuit before the temperature of the post-startup operation circuit reaches the threshold temperature, the first operation guaranteed temperature range is a range of temperature that the post-startup operation circuit can operate normally, and the second operation guaranteed temperature range is a range of temperature that the startup operation circuit can operate normally.