Data output circuit of a semiconductor apparatus

摘要

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.

主权项

1. A data output circuit of a semiconductor apparatus, comprising:
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; a control block configured to generate the selection signals in response to mode register signals; and 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.