| abstract |
A kind of semiconductor memory device is disclosed in the present invention. The invention is featured with containing plural memory chips MC1, MC2, and I/O (input/output) terminal 13, which is disposed in accordance with these plural memory chips. The I/O terminal, after the power source is plugged in, is capable of outputting a busy signal of busy state when the power source voltage reaches the guaranteed range in the specification, outputting a busy signal of maintaining busy state during the period before completing the initialization operations of plural memory chips, and outputting a busy signal of relieving busy state after completing the entire initialization operations of plural memory chips. |