| 摘要 |
Reducing power consumption of a semiconductor memory device having a serial interface is disclosed. After parallel read-out data from a memory-cell matrix 14 are held in a data latch 17 , the parallel read-out data are selected sequentially by a serial output selector 18 according to timing signals SL 0 -SL 15 from a controller 20 and are outputted serially from an output buffer 19 as an output data DO. In an activating control unit 23 , outputting an operation control signal AC to a gate-voltage generating unit 21 , a drain-voltage generating unit 22 , and a sense amplifier 16 is being halted during from when a timing signal SL 0 is finished to when a timing SL 10 is finished. Consequently, during the above mentioned period, the unnecessary operations of the gate-voltage generating unit 21 , the drain-voltage generating unit 22 , and the sense amplifier 16 are being halted and then the power consumption thereof can be reduced.
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