SEMICONDUCTOR MEMORY DEVICE AND DATA READ METHOD THEREOF

摘要

PURPOSE: A semiconductor memory device and a data read method thereof are provided to read data accurately during a high frequency operation. CONSTITUTION: A data output buffer(14-1,14-2) inputs data in response to an on-time control signal, and buffers and latches the above inputted data in response to a latch clock signal. The first clock signal generator(22') generates the first clock signal. A latency signal generator(26) establishes and generates latency signals while setting a mode. The second clock signal generator(22') generates the second clock signal varying according to the latency signals by inputting the first clock signal. A latch clock signal generator(24) generates the latch clock signals in response to the first clock signal and the latency signals. And an on-time control signal generator(28) generates the on-time control signal in response to the second clock signal and the latency signals.