The semiconductor device (11) of the invention comprises a circuit that is covered by a passivation structure. It is provided with a first security element (12) that comprises a local area of the passivation structure and which has a first impedance. Preferably, a plurality of security elements (12) is present, whose the impedances differ. The semiconductor device (11) further comprises measuring means (4) for measuring an actual value of the first impedance, and a memory (7) comprising a first memory element (7A) for storing the actual value as a first reference value in the first memory element (7A). The semiconductor device (11) of the invention can be initialized by a method wherein the actual value is stored as the first reference value. Its authenticity can be checked by comparison of the actual value again measured and the first reference value.

 
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> Interface circuit system and method for autonomously performing power management operations in conjunction with a plurality of memory circuits

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