Patent ID: 7075845

Claim:
A sense amplifier array having a data bus pull-down sensing function for sensing data outputted through a data bus from a cell array having a hierarchical bit line architecture including main bit lines and sub bit lines, the sense amplifier array comprising: a bus pull-up unit for pulling up the data bus in a precharge mode; a bus pull-down unit for pulling down a voltage of the pulled-up data bus to a predetermined level before data are sensed; a sense amplifier unit for sensing a voltage of the data bus depending on a previously set sensing detection threshold voltage; a lock switch unit for selectively transmitting data sensed in the sense amplifier unit in response to a lock signal; a data latch unit for storing data transmitted through the lock switch unit; a data-out regulating unit for transmitting data stored in the data latch unit to a data buffer for external output; and a write switch unit for selectively transmitting data of the data-out regulating unit to the data bus for data restoration.