Semiconductor device
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United States of America Patent
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N/A
Issued Date -
Oct 5, 2006
app pub date -
Mar 31, 2006
filing date -
Apr 5, 2005
priority date (Note) -
Abandoned
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Abstract
A semiconductor device includes an internal circuit having a data holding circuit, and at least one leakage current cut-off circuit provided between the internal circuit and a power supply or a ground, and is capable of preventing data in the data holding circuit from being destroyed. A ground-side cut-off circuit includes a switch and a control circuit. The switch electrically connects or cuts a path between a source of a ground-side transistor of the internal circuit and the ground. The control circuit turns off the switch upon detecting that source potential of the ground-side transistor is substantially equal to that of the ground. Upon detecting that the source potential of the ground-side transistor rises to a predetermined potential lower than a potential necessary for holding the data in the data holding circuit, the control circuit turns on the switch.
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