Tutunjian & Bitetto, P.C.
On-chip security key with phase change memory
A method is presented for forming an on-chip security key. The method includes electrically connecting a pair of phase change memory (PCM) elements in series, electrically connecting a programming transistor to the pair of PCM elements, electrically connecting an input of an inverter to a common node of the pair of PCM elements, setting the PCM elements to a low resistance state (LRS) in an initialization stage, applying a RESET pulse to generate a security bit and to cause one of the PCM elements to change to a high resistance state (HRS), and generating a logic “1” or “0” at the output of the inverter.
International Business Machines Corporation
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Carl Kangguo Juntao Ruilong
Radens Cheng Li Xie