DEVICE FOR DRIVING WORD LINE

摘要

PURPOSE: A devide is provided to selectively pull down a non-selected word line voltage to a bias voltage of a circuit board or a ground voltage according to an enabling state of a block selection signal so that it can increase a data keeping period of a cell by reducing a gate-off loss of a cell transistor at a repetition of a row active operation within the same block and enhance an efficiency by widening a process window of the cell transistor. CONSTITUTION: A device comprises a pull up driver(10), a pull down driver(20) and a pull down controller(30). The pull up driver(10) pulls up a voltage of a selected word line to a voltage(Vpp) higher than a source voltage(Vcc) by a preset voltage(Vt) according to an output signal(A) of the row decoder. The pull down driver(20) pulls down the voltage of the non-selected word line to a 1st voltage(Vss) or a 2nd voltage(Vbb) under the control of the output signal from the row decoder. The pull down controller(30) selectively switches the pull down voltage to the 1st voltage(Vss) or 2nd voltage(Vbb) according to the block selection signal(BS) controlling to activate only the cell array block selected by a row address.