Patent ID: 9065444
Filing Date: 2015-06-23
Classification: H03K

Abstract:
1. A power-up initial circuit, comprising: a power-up control unit for receiving a high voltage start-up signal, and generating a first power-up control signal; a first switch having a first terminal for receiving an external voltage, a second terminal coupled to the power-up control unit for receiving the first power-up control signal, and a third terminal; and a second switch having a first terminal coupled to the third terminal of the first switch, a second terminal coupled to the power-up control unit for receiving the first power-up control signal, and a third terminal for coupling to a high voltage generator; wherein the high voltage generator is turned on or off according to the high voltage start-up signal, and potential of the third terminal of the second switch is equal to the external voltage or an internal high voltage according to conditions of turning-on and turning-off of the high voltage generator, the first switch, and the second switch.