FreeLists / si-list / [SI-LIST] CPLD Device Failures...

[srinivasarao d <srao_d@xxxxxxxxxxx>]

Hi,=0AI am not sure whether I can post this query in this forum !!!=0A=0AI =
have a board, where there are almost 70+  IC's in the board (SDRAM, Process=
or, Ethernet Phy etc..).=0AThe problem I am facing is that, the CPLD is get=
ting burnt. The Failure rate is almost 3%. The CPLD used is MAXII 1270 from=
 altera (The VCCINT is 3.3V, using the device with internal regulator)=0A=
=0ADid any of you come across the similar issue??. If yes what is the solut=
ion arrived at?=0AThe problem is there in multiple of our designs. And the =
problem happens only during power cycle (not sure whether during power up o=
r power down).=0A =0AI observed the power supply fall time is of order 200u=
s (Very fast discharge) and rise time is order 1ms.=0AThe undershoot in the=
 3.3V power supply is only -0.3V during power down.=0A=0AThanks in advance=
=0Asrao=0A=0A=0A=09=09=0A__________________________________________________=
________=0AYahoo! India Answers: Share what you know. Learn something new=
=0Ahttp://in.answers.yahoo.com/
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