| 摘要 |
PROBLEM TO BE SOLVED: To realize an internal boosting circuit in which output voltage of external positive power source voltage is constant and is operated stably in a wide voltage range from low voltage to high voltage, also reliability of elements is secured, and a semiconductor chip. SOLUTION: One voltage drop circuit 12 and two boosting circuits 13, 14 are provided in a chip, the voltage drop circuit 12 generates constant voltage VARY from external voltage VDD and supplies voltage to a bit line, the first boosting circuit 13 supplies external voltage VDD, generates internal boosting voltage VPPL, and supplies voltage to a pre-charge circuit of a bit line, the second boosting circuit 14 supplies internal boosting voltage VPPL, generates internal boosting voltage VPPH, and supplies voltage to a word line. Voltage difference between VPPL and VARY is assumed to constant, and adjusted higher than a threshold value of MOS constituting the pre-charge circuit, and voltage difference between VPPH and VARY is assumed to constant, and adjusted higher than a threshold value of MOS constituting a memory cell.
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