Fuse trimming in plastic package devices

Static information storage and retrieval – Read only systems – Fusible

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Details

36518907, 365196, 365201, 3652257, G11C 1716

Patent

active

053847270

ABSTRACT:
A method and apparatus provide fuse trimming of analog integrated circuit parameters in plastic packages. The apparatus includes an electrically interruptible circuit element, such as a fuse; a level reading unit which reads the state of the electrically interruptible circuit element and generates a code in response to the state; a state altering unit, such as a current source for providing a blow current; and a control circuit. A test level reading device allows screening for marginally-blown fuses. A switchable element removes applied voltage from fuses when the fuse is not being blown or read to prevent fuse regrowth.

REFERENCES:
patent: 5083293 (1992-01-01), Gilberg et al.
patent: 5260907 (1993-11-01), Kim
patent: 5325323 (1994-06-01), Nizaka
"A Low-Power 12-b Analog-to-Digital Converter with On-Chip Precision Trimming", de Wit, et al., IEEE Journal of Solid-State Circuits, vol. 28, No. 4, Apr. 93, pp. 455-461.

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