Patent ID: 7154789

Claim:
A voltage detector circuit, comprising: a voltage divider configured to divide a high voltage to generate a divided voltage at an output node, the voltage divider including a first resistor having a first terminal connected to the high voltage, a second resistor having a first terminal connected to the output node, and a first low-voltage transistor having a drain connected to a second terminal of the second resistor, a source connected to a ground voltage, and a gate configured to receive a first control signal; a discharge section configured to discharge the high voltage to a power supply voltage in response to a second control signal; a comparator configured to determine whether the divided voltage at the output node reaches a reference voltage; and a control signal generator configured to output a pump control signal in response to a comparator output signal and the second control signal, the voltage divider including a high-voltage prevention circuit configured to prevent the high voltage from being applied to a second low-voltage transistor of the comparator while the high voltage is discharged, the high-voltage prevention circuit including a first high-voltage transistor having a drain connected to a second terminal of the first resistor, a source connected to the output node, and a gate connected to the power supply voltage.