Low leakage IO circuit and associated apparatus
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United States of America Patent
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Nov 25, 2014
Grant Date -
Jun 14, 2012
app pub date -
Jul 22, 2011
filing date -
Dec 13, 2010
priority date (Note) -
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Abstract
A low-leakage IO circuit is provided. The IO circuit includes an impedance path between a pad and a power supply. The impedance path bypasses a signal path of the pad and includes a switch circuit. According to a relationship between voltages of the power supply and the pad of the IO circuit, the switch circuit selectively conducts the impedance path. When the power supply provides power normally, the switch circuit conducts the impedance path to provide a pull-up resistor between the pad and the power supply. When the power supply provides no power and its voltage is lower than a voltage of the pad, the switch circuit disconnects the conducting path to effectively reduce power leakage.
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