I/O cell configuration for multiple I/O standards
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United States of America Patent
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-
Aug 7, 2001
Grant Date -
N/A
app pub date -
Mar 23, 2000
filing date -
Mar 24, 1999
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Circuitry is provided to individually configure each I/O of an integrated circuit to be compatible with a different LVTTL I/O standards. This can be done with only one I/O supply voltage, where that voltage is the highest of the I/O voltages needed in a particular application. The circuitry operates by regulating the output voltage of the I/O cell so that it is above the VOH and below the maximum VIH for the LVTTL standard for which it will comply with. Since each I/O cell is individually configurable, any I/O can drive out to any LVTTL specification.
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