Input buffer for supplying semiconductor device with internal signal based on comparison of external signal with reference potential
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United States of America Patent
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Feb 6, 2001
Grant Date -
N/A
app pub date -
Feb 5, 1998
filing date -
Jun 16, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An input buffer of a semiconductor device is provided. A first voltage shift circuit converts an input signal formed of a low amplitude logic signal overlapping 1.65V or 2.9V to a first signal formed of a complimentary signal formed of the low amplitude logic signal overlapping 2.9V or 1.65V. A second voltage shift circuit converts a reference potential of 1.65V or 2.9V to a second signal of 2.9V or 1.65V. A differential amplifier compares the reference potential with the input signal when the reference potential is 1.65V, and compares the first signal and the second signal when the reference potential is 2.9V. The input buffer thus operates normally whichever of 1.65V and 2.9V is the reference potential.
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