I/O buffer with wide range voltage translator
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United States of America Patent
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Feb 28, 2006
Grant Date -
Mar 31, 2005
app pub date -
Mar 22, 2004
filing date -
Sep 26, 2003
priority date (Note) -
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Abstract
In accordance with an aspect of an input/output device for providing fast translation between differential signals from a core of an integrated circuit and higher voltage signals that are external to the core, an I/O buffer includes low voltage devices for receiving core input signals, a cascode stage for setting a bias between the input devices and an output stage, and an output stage including a current mirror for providing a translated external output. Another aspect of the invention further includes a feedback path to cut off the current mirror to prevent static current and a keeper device to maintain an output level after cut off of the current mirror.
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