| 摘要 |
<p>PURPOSE:To speed up an access by providing a charge means at a side opposite to the row decoder of row lines, and charging up a row line speedily if the line is selected. CONSTITUTION:When address data A1-An shift and a row line is selected, a control signal phi temporarily goes to a high level, and the potential at a point C goes to a ground potential VS. Thereafter, if the row line is charged up, the potential of the point A reaches a high voltage level comparatively fast, but that of a point B rises only gradually because of the resistor and the stray capacity of the row line. When the potential of the point C exceeds the logical threshold of an inverter circuit 3 through a capacity element C1, the output of the circuit 3 goes to a low level, a P-type MOSFET Tr4 turns on to supply a high voltage from the power source VC to the point B. Therefore, the charge-up of a selected row line is quickly executed, hence the access is speeded up.</p> |
