Integrated circuit having an EEPROM, semiconductor wafer provide

Details Integrated circuit having an EEPROM, semiconductor wafer provide Integrated circuit having an EEPROM, semiconductor wafer provide

1995-04-13

1997-09-30

Dinh, Son T.

Static information storage and retrieval

Read/write circuit

Testing

365226, 371 211, 371 213, G11C 700

Patent

active

056732287

ABSTRACT:
Integrated circuits comprising an EEPROM require a large amount of time for testing, because the write time for a memory cell is very long. Notably the first test after manufacture, with the circuit still present on the wafer, is time consuming. The invention proposes a drastic reduction of the duration of the first test after manufacture by supplying a number of integrated circuits with a voltage in parallel and by providing each integrated circuit with an element whereby several block-wise write cycles for alternately "0" and "1" are executed in substantially autonomously and at the end of the first test step predetermined information is retained. This step is followed by a thermal treatment, after which the integrated circuits are individually contacted and first tested for information retention. For the parallel powering of the number of integrated circuits with an operation voltage during the first test step, supply terminals of the integrated circuits of this number are interconnected across the severing lanes on the wafer and one of the integrated circuits is contacted. When the individual integrated circuits are severed from one another, these conductor tracks are then automatically cut.

REFERENCES:
patent: 5056089 (1991-10-01), Furuta et al.
patent: 5060198 (1991-10-01), Kowalski
patent: 5347492 (1994-09-01), Horiguchi et al.

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