SEMICONDUCTOR MEMORY DEVICE

摘要

PURPOSE: A semiconductor memory device is provided to secure margin of a global input and output line by optimally setting an activation section of a pipe input signal. CONSTITUTION: A column selection signal generating unit(110) receives a read command signal(RD_CMD). The column selection signal generating unit generates a column selection signal with a pulse width of a read command signal or a column selection signal which is extended than the pulse width of the read command signal in response to a bank grouping mode signal. A pipe input signal generating unit(120) receives a column selection signal outputted from the column selection signal generating unit. The pipe input signal generating unit generates a pipe input signal(RD_PIN) with a pulse width of a column selection signal or a pipe input signal which is reduced than the pulse width of the column selection signal.