SEMICONDUCTOR MEMORY DEVICE

摘要

PURPOSE: A semiconductor memory device is provided to pre charge a local data bus within a short time by turning a signal detected from sensed data and to increase burst property and AC property. CONSTITUTION: A semiconductor memory device contains a column pre charge controller(130), a column decoder(40) and a sense amplifier(170) and adds a 'FDB' signal. The data of a bit line sense amplifier(50) is loaded on a local data bus and transferred to a data bus sense amplifier(170) to be sensed. Then the sensed data is fed to a global data bus and the FDB signal is enabled at the same time. Thus, the local data bus is pre charged in a Vprc(pre charge voltage) state and the data bus sense amplifier is pre charged or on standby during disabling Yi and PRC in the column pre charge controller and a column decoder(40).