Output buffer having sequentially-switched output
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United States of America Patent
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Dec 6, 1988
Grant Date -
N/A
app pub date -
Dec 8, 1986
filing date -
Dec 23, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An integrated semiconductor circuit includes an output stage and a control circuit. The output stage comprises several (e.g. four) pull-down output transistors, which are sequentially switched on for pulling down the output node, whereby four small current steps are made instead of one high current step. As a result the package inductance generated power supply line noise will be substantially reduced (by at least a factor four). The same technique can be used for limiting the supply line noise due to the charge current for charging the output node via pull-up transistors.
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