| 摘要 |
A high-voltage sensing circuit is provided that inhibits or prevents a low-voltage from being inadvertently sensed as a high-voltage during power-up and power-down and triggering a high-voltage operation such as a chip erase. The high-voltage sensing circuit comprises a low-power supply sensing circuit for generating a control signal in response to the detection of a power supply level and a switch, controlled by the control signal, that receives the input voltage and passes an output voltage if the input voltage is greater than a reference voltage. Until the power supply exceeds a certain amount, a switching transistor will be OFF and VIN (the output of the charge pump) will not be high enough. Thus, a low-voltage is prevented from being inadvertently sensed by the high-voltage sensing circuit as a high-voltage and triggering a high-voltage operation such as a chip erase. |
