Memory device having a controller capable of disabling data input/output mask (dqm) input buffer during portions of a read operation and a write operation

Abstract

An integrated circuit memory device includes a DQM input buffer controller that enables the DQM buffer to process the DQM mask signal during a row active period of a read operation and a write operation of an integrated circuit memory device, and during a latency period of the read operation and the write operation, and that disables the DQM buffer otherwise during the read operation and the write operation. Thus, the DQM buffer is enabled to process the DQM mask signal during those portions of the read and write operations in which the external DQM mask signal is received and the DQM buffer is otherwise disabled during the read and write operations. The controller can also disable the DQM buffer during a refresh operation of the memory device and a power-down operation of the memory device. Accordingly, reduced current consumption in the DQM buffers may be obtained by only enabling the DQM input buffers when a DQM mask signal is expected during the read and write operations of the memory device.