Data output circuit of a semiconductor apparatus
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United States of America Patent
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-
May 31, 2016
Grant Date -
Oct 1, 2015
app pub date -
Jul 8, 2014
filing date -
Mar 27, 2014
priority date (Note) -
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Abstract
A data output circuit of a semiconductor apparatus is provided. The data output circuit may include a pull-up driver including a plurality of leg units configured to provide respective resistance values which are selected based on code signals, provide a total resistance value which is selected in response to one or more of the plurality of leg units being selectively activated based on selection signals, and configured to apply an output voltage with an output voltage level selected according to the selection of the total resistance value among a plurality of output voltage levels, to a data output pad. The data output circuit may include a control block configured to generate the selection signals in response to mode register signals. The data output circuit may include a code generator configured to generate the code signals based on a comparison of a reference voltage to a replica output voltage which varies according to an external resistance.
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