Secure circuit structure

Details Secure circuit structure Secure circuit structure

1991-04-26

1991-12-10

Griffin, Donald

Electricity: electrical systems and devices

Electrostatic capacitors

Fixed capacitor

365 53, H02B 100, G11C 700

Patent

active

050723316

ABSTRACT:
A secure circuit structure includes a pair of opposed substrates having a volatile circuit fabricated on at least one, and preferably both substrates. A maintenance circuit for the volatile circuit extends between the substrates so that it is interrupted, thereby altering the volatile circuit and rendering reverse engineering attempts futile, if the substrates are moved with respect to each other by opening the circuit package. The maintenance circuit preferably includes a series of mating conductive indium bumps that extend from the opposed substrates and mechanically bond the substrates together. The secured volatile circuit may be a random access memory storing an access code, maintained by a battery power supply circuit.

REFERENCES:
patent: 4766516 (1988-08-01), Ozdemir et al.
patent: 4933898 (1990-06-01), Gilberg et al.
patent: 4982371 (1991-01-01), Bolan

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