I/O driver for integrated circuit with output impedance control
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United States of America Patent
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Apr 3, 2012
Grant Date -
Oct 29, 2009
app pub date -
Oct 27, 2008
filing date -
Apr 24, 2008
priority date (Note) -
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Abstract
An I/O driver has v/i characteristic control for maintaining a substantially flat output impedance response using a transmission gate configuration at an I/O output pad. The configuration includes a linear resistive element electrically connected at an I/O pad for limiting a processed data I/O signal, an active impedance element for receiving and processing the data signal, which comprises data represented by a series of voltage state transitions, and pull-up and pull-down array calibration words, for generating and outputting a processed I/O output signal to the resistive element to output a substantially flat v/i response at switching of the data signal.
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