Static information storage and retrieval – Powering
Reexamination Certificate
2007-04-10
2007-04-10
Nguyen, Tuan T. (Department: 2824)
Static information storage and retrieval
Powering
C365S228000, C365S185180, C365S185260, C365S189090
Reexamination Certificate
active
10528997
ABSTRACT:
When an input voltage determining circuit24determines that an input voltage exceeds a prescribed voltage, a control circuit25of a positive polarity power selector circuit22turns on a first switch SW1and turns off second and third switches SW2and SW3, thereby supplying the input voltage to a memory cell array21via the first switch SW1. When the input voltage determining circuit24determines that the input voltage is not higher than the prescribed voltage, the control circuit25turns off the first switch SW1and turns on the second and third switches SW2and SW3, thereby supplying a voltage from a charge pump23via the second and third switches SW2and SW3. By this operation, the memory element is able to retain storage of two bits or more even if miniaturized, to execute stable operation with a small circuit area and to prevent circuit malfunction attributed to a small current supplied to the memory cell array.
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Iwata Hiroshi
Nawaki Masaru
Shibata Akihide
Tokui Kei
Yaoi Yoshifumi
Nguyen Tuan T.
Wendler Eric J.
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