A semiconductor IC device which includes a common column signal generating block and a column strobe signal generating block. The common signal generating block can provide precolumn strobe signals by using external command signals and a first group of bank addresses among a plurality of bank addresses. The column strobe signal generating block can provide a plurality of column strobe signals to selectively activate a plurality of banks by using the precolumn strobe signals and a second group of bank addresses among the plurality of bank addresses that are not used when the precolumn strobe signals are generated.