SEMICONDUCTOR MEMORY DEVICE CAPABLE OF CONTROLLING SELF REFRESH PERIOD, ESPECIALLY REDUCING TIME REQUIRED FOR PERFORMING AUTHENTICATIONS

摘要

PURPOSE: A semiconductor memory device capable of controlling a self refresh period is provided to reduce the time required for performing the verification of the fail related to the SELF_EXIT and the self refresh period authentication. CONSTITUTION: A semiconductor memory device capable of controlling a self refresh period includes an inverter(12), a first oscillator(14), a second oscillator(16), a first transfer gate(18) and a second transfer gate(20). The semiconductor memory device is characterized in that it generates the refresh control signal with a period of the test mode shorter than that of the normal operation mode.