Circuit and method for dynamically controlling the impedance of an input/output driver
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United States of America Patent
Stats
-
Aug 31, 2004
Grant Date -
Mar 4, 2004
app pub date -
Sep 4, 2002
filing date -
Sep 4, 2002
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Disclosed is an input/output (IO) device having a power supply node, an input node for receiving an input data signal, and an output node for outputting an output data signal generated in response to the input node receiving the input data bit signal. The IO device also includes a pull-up driver coupled to the power supply node and the output node, wherein the pull-up driver comprises an impedance at the output node which is constant for all voltages at the output node. Additionally, the IO device may have a circuit coupled to the input node, the pull-up driver, and the output node. This circuit is configured to generate a signal that is provided to the pull-up driver. The signal generated by the circuit varies as a function of the voltage at the output node.
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