| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a highly reliable EEPROM which can make data-hold time be infinite similar to a mask ROM and hold data over a long period of time. <P>SOLUTION: A nonvolatile semiconductor storage device comprises: a first nonvolatile semiconductor storage element 100 having a thermal equilibrium state threshold voltage which is positive with respect to a predetermined sense level, for storing positive data; and a second nonvolatile semiconductor storage element 200 having a thermal equilibrium state threshold voltage which is negative with respect to the predetermined sense level, for storing negative data. Accordingly, data-hold time is made to be infinite. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
