GLOBAL DATA BUS LATCH

摘要

PURPOSE: A global data bus latch is provided which increases timing margin of a data bus by making data be retained in the data bus for a sufficient time. CONSTITUTION: In a semiconductor memory device including a global data bus and a local data bus, a global data bus latch includes: the first storing unit(102) to store data transferred through the first global data bus, and to reset the stored data by the first control signal from the external; the second storing unit(104) to store the inverted data of the data transferred through the second global data bus and to reset the stored data by the first control signal; the first local data bus driver(106) to transfer the data stored in the first storing unit to the first local data bus in response to the second control signal from the external; and the second local data bus driver(108) to transfer the data stored in the second storing unit to the second local data bus in response to the second control signal. Thus, the global data bus latch increases the timing margin of the data bus by making the data be retained in the data bus for a sufficient time.