| 摘要 |
PROBLEM TO BE SOLVED: To reduce power consumption at the time of a self-refresh operation in a semiconductor memory device having hierarchical input/output line constitution. SOLUTION: At the time of the self-refresh operation, a delay circuit 22 outputs a delay signal ZBBUD responding to a self-refresh instruction signal ZBBU outputted form a self-refresh switching circuit 5. A switching driver 140 receives the delay signal ZBBUD, and makes a pair of global input/output line and a pair of local input/output line non-connection. Consequently, at the time of the self-refresh operation, voltage is not transferred between the pair of global input/output line and the pair of local input/output line.
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