On die thermal sensor suitable for auto self refresh, integrated circuit with the same and method for on die thermal sensor suitable for auto self refresh

摘要

A semiconductor memory device includes a reference voltage generator for generating a plurality of reference voltages each having different voltage levels in response to a self refresh enable control signal, and a voltage comparator for generating a result signal that controls a self refresh operation cycle by comparing each of the plurality of reference voltages with a temperature information voltage that represents an internal temperature of an integrated circuit.