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Browse Prior Art Database

Fast Electronic Fuse Component for Use During CMOS Burn-in

IP.com Disclosure Number: IPCOM000121217D
Original Publication Date: 1991-Aug-01
Included in the Prior Art Database: 2005-Apr-03
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Dhong, SH: AUTHOR [+2]

Abstract

Disclosed is a fast, resettable series electronic switch or fuse component which will interrupt an abnormally high current fast enough to prevent damage to the chip under stress.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 74% of the total text.

Fast Electronic Fuse Component for Use During CMOS Burn-in

      Disclosed is a fast, resettable series electronic switch
or fuse component which will interrupt an abnormally high current
fast enough to prevent damage to the chip under stress.

      Latch-up of CMOS chips tends to be more common during burn-in.
High oven temperature and high power supply voltages associated with
burn-in can aggravate latch-up triggers through either increased
substrate leakage or junction breakdown, resulting in the burn-out of
the product under stress.  In addition to loss of product, latch-up
events can place sometimes undue blame on the CMOS product itself for
not being sufficiently latch-up immune.

      Conventional fast fuses placed in series with the chip under
stress are not always fast enough to prevent chip damage during
latch- up.  Analog device companies offer SCR crowbar-type devices
(*) that place a short across the power supply during an irregular
power supply condition but not a fast open-circuit.  This invention
describes a series electronic component that can open-circuit quickly
during a high current condition.  It may be integrated onto a single
chip, or made up of discrete components.  The schematic for this
component is shown in the figure.  R1, or the device resistance of
power FET Q1, is used to sense the load current.  When the load
current rises above a certain limit, differential amplifier U1 sets
latch U2, which then applies a high on the gat...