IC devices with a built-in circuit for protecting internal infor

Details IC devices with a built-in circuit for protecting internal infor IC devices with a built-in circuit for protecting internal infor

1998-09-24

2000-06-06

Tokar, Michael

Electronic digital logic circuitry

Security

326 8, 326104, 326136, 250214R, 250214SW, 250221, 2502221, 250229, H03K 19007, H03K 1920, H03K 1900, H01J 4014, G01D 534

Patent

active

060723289

ABSTRACT:
A plurality of light-receiving devices dispersed over the area of an IC chip operate in response to the opening of an IC device such that switching transistors are turned on or off to prohibit the normal operation of logic circuits or logic elements, thereby securing protection against normal reading of the internal data of the opened IC device, particularly against the analysis of the IC's internal logic with an electron beam tester.

REFERENCES:
patent: 4814846 (1989-12-01), Matsumoto et al.
patent: 4870612 (1989-09-01), Wigur
patent: 4887239 (1989-12-01), Turner

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