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Per my experience ,Diodes + RC-Control , inverter and PowerClamp is better for out pad/ @& l- y5 v) I( T4 }6 P" k& \
Generally speaking ,the root cause of ESD failed is from below.# o. {5 ]1 `& v7 |+ f
<i>clamp NMOS's ability.
' b6 |9 D- j7 @<ii>clamp NMOS's turn-on rate.2 `8 U$ ~- a6 |) {$ R7 m
<iii>Not follow design rule.......................
9 l _5 a) T) U2 P, X0 w' n. N) `As we know ,RC-control is to keep clamp NMOS off when IC is on normal operation.(us)- I* H6 g7 i" f. C- g/ R
When sufferred ESD pulse(ns),GGNMOS be turned on by coupling .$ Y' {+ c6 k5 o1 A7 o, P/ Y
If adding inverter between RC and clamp NMOS,it will speed up clamp NMOS turned on.
0 h( U2 Y( x$ u9 ~# D3 }0 gJust for reference !!! |
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發表於 2010-5-10 14:38:41
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