Interface circuit for a functional unit of a multi-chip system
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United States of America Patent
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Issued Date -
Sep 20, 2007
app pub date -
Dec 22, 2006
filing date -
Mar 17, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An interface circuit connected between the functional unit and the output/input bus in a multi-chip system is disclosed. One characteristic of the present invention is that the positive voltage protecting diode located between the independent power of the functional unit and the output/input bus in the functional circuit is not required. Therefore, the signal on the output/input bus will not be distorted due to the low resistance load caused by shutting down the independent power of the functional unit. Another characteristic of the present invention is that the negative voltage protecting diode located between the output/input bus and the grounding in the functional circuit is changed to a stable voltage Zener diode. Therefore, the high voltage static electricity is guided into the grounding via the Zener diode so that the goals of anti-static electricity and protecting the functional unit are achieved.
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