Interface circuit power reduction
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United States of America Patent
Stats
-
Oct 14, 2008
Grant Date -
Apr 7, 2005
app pub date -
Sep 17, 2004
filing date -
Sep 17, 2003
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Embodiments of the invention provide an interface circuit that is capable of reducing the power consumption, which may be increased by a shoot-through current, and provide an electronic device having such an interface circuit. In one embodiment, an interface circuit exchanges signals with another electronic device via a signal transmission line. The interface circuit includes a switch for pulling up the signal transmission line and a switch for pulling down the signal transmission line. While a pull-up or pull-down is performed, the interface circuit detects the potential level of the signal transmission line to determine whether the signal transmission line is pulled down or pulled up by the other electronic device. If the signal transmission line is not pulled down/pulled up by the other electronic device, the interface circuit exercises pull-down/pull-up control.
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