Semiconductor integrated circuit chip having an identification c

Details Semiconductor integrated circuit chip having an identification c Semiconductor integrated circuit chip having an identification c

1990-09-06

1992-04-07

Wieder, Kenneth A.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With rotor

324 731, 324537, 307304, 437 8, G01R 2702, G06F 1122

Patent

active

051031663

ABSTRACT:
A semiconductor integrated circuit chip has an identification circuit connected between a power voltage supply terminal and one of the input terminals of the chip. The identification circuity includes a voltage limiter to limit the input potential difference between the power voltage supply terminal and the input terminal to a predetermined voltage level. The identification circuit further includes an option device connected to the voltage limiter to provide identification information of the chip. According to the identification circuit, chip identification testing may be achieved with existing input/output and power supply terminals, thereby eliminating the need for extra test and diagnosis pins or additional identification equipment employed during testing.

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