Circuit for generating an identification code for an IC
US7210634B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 12, 2004 |
| Grant date | May 1, 2007 |
| Priority date | — |
| Expiry date | Sep 17, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07F7/082
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A ID circuit produces a unique binary identification code (ID) for each integrated circuit in which it is implemented by setting states of each bit of the ID as a function of random variations in material forming the IC that occur at the time the IC is fabricated. The ID circuit includes an ID generating circuit for generating the ID, a non-volatile memory, and a control circuit for writing the ID generated by the ID generating circuit into the non-volatile memory in response to a first occurrence of a write cue event. Thereafter the control circuit responds to each occurrence of a read cue event by reading the ID out of the non-volatile memory and providing it as an IC output.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.