| 摘要 |
PURPOSE:To change over and use the same device to a low power consumption type or high speed type in accordance with the purpose by changing over and setting a control signal with a row address buffer and a column address buffer. CONSTITUTION:When an electric power source is turned on, a change-over signal VD is inputted from an external circuit to a selecting circuit 16, and by the output, a row address buffer 14 and a column address buffer 15 execute the usual action with a constant level signal. Next, for initialization when the level of the signal VD is changed to a higher level, a chip enable signal CE' is outputted through the selecting circuit 16 and supplied to the buffers 14 and 15. Consequently, in accordance with the signal VD, changing-over and setting can be executed concerning whether a memory array 11 is controlled by the signal CE' or the array is always controlled by a constant signal.
|
