Multi-channel semiconductor integrated circuit devices are provided including a plurality of memory devices that are independently accessible, each of the plurality of memory devices including at least one power generation unit and a control unit for controlling an operation of the at least one power generation unit, a detection unit for detecting an operation state of the plurality of memory devices, and a common control unit for commonly controlling an operation of the at least one power generation unit of the plurality of memory devices, according to the operation state of the plurality of memory devices detected by the detection unit. The control unit of each of the plurality of memory devices controls the operation of the at least one power generation unit of a corresponding one of the plurality of memory devices.