| 摘要 |
The present invention relates to a low voltage detector. The low voltage detector comprises a first flash memory cell driven by a ground voltage, for maintaining the potential of a first node to a given potential; a second flash memory cell driven by a power supply voltage, for controlling the potential of a second node; and a comparator for comparing the potentials of the first node and the second node. The difference in current between the first over-erased flash memory cell and the second weakly-programmed flash memory cell is sensed instead of using the reference voltage generator. Thus, a low voltage to be sensed can be freely determined by controlling a cell current. Further, according to the present invention, a constant current can be secured without being affected by change in the supply voltage using the over-erased flash memory cell. In addition, as a circuit to which the first and second flash memory cells are connected is symmetrically constructed, the circuit is not affected by change in the temperature or process.
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