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发明授权
CN104184308B 半导体集成电路及其动作方法 有权

半导体集成电路及其动作方法
摘要：
一种半导体集成电路及其动作方法，降低在电源供给电路执行对主电源的电源电压和来自辅助电源的备份电源电压的选择时的电压下降，减轻辅助电源的功耗。半导体集成电路的电源供给电路具备测量电路、开关控制电路和开关电路，开关电路包括：第1开关元件，连接于被供给主电源电压(VM)的第1输入端子与输出端子之间；第2开关元件，连接于被供给辅助电源电压(VB)的第2输入端子与输出端子之间。测量电路通过第1输入端子的主电源电压而动作，将(VM)和(VB)进行比较。在(VM)是比(VB)低的电压的情况下，响应测量电路的判定信号(SD)，开关控制电路将开关电路的第1开关元件和第2开关元件分别控制为截止状态和导通状态。
摘要（英）：

The present invention is made to not only reduce voltage drop when a power supply circuit makes a selection between a power supply voltage from a main power supply and a backup power supply voltage from an auxiliary power supply, but also reduce the power consumption of the auxiliary power supply. The power supply circuit, which is in a semiconductor integrated circuit, includes a measurement circuit, a switch control circuit, and a switch circuit. The switch circuit includes a first switch element and a second switch element. The first switch element is coupled between an output terminal and a first input terminal. The second switch element is coupled between the output terminal and a second input terminal. The measurement circuit operates on the main power supply voltage at the first input terminal and compares the main power supply voltage with the auxiliary power supply voltage.

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