| 摘要 |
An integrated circuit comprising a source voltage monitoring unit that monitors the level of a first source voltage supplied from an external power source, determines whether the first source voltage is supplied from the external power source, and controls an internal power source and the external power source; so as to apply the first source voltage, when determining that the first source voltage is supplied; and so as to apply a second source voltage supplied from the internal power source, whose level is lower than that of the first source voltage, when determining that the first source voltage is not supplied, wherein the integrated circuit operates with application of either one of the first source voltage and the second source voltage.
|
