| 摘要 |
<p>PURPOSE: To apply a read-out voltage, programming voltage, and deletion voltage to a word line by connecting respectively first and second separation transistors between an output of a positive polarity voltage switching means and a word line, between a deletion voltage source and a word line. CONSTITUTION: A source/drain path of a first separation transistor T1 is connected between a power terminal A of a positive polarity voltage switching circuit 10 and a terminal of a word line WL, a gate is connected respectively to a negative polarity signal processing voltage source Vcp during a read-out operation period, a read-out voltage source Vsv during a programming operation period, and an external power source voltage Vdd during a deletion operation period, through a switch SW4. A source/drain path of a second separation transistor T2 is connected between a deletion voltage source Ver/HI and a terminal of the word line WL, the gate itself is connected to the drain, and further connected to the deletion voltage source Ver/HI. Thereby, read-out voltage, programming voltage, and deletion voltage can be switched and supplied.</p> |
