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Per my experience ,Diodes + RC-Control , inverter and PowerClamp is better for out pad. d; ]0 I! D' C+ ]" x0 v. L
Generally speaking ,the root cause of ESD failed is from below.' J- W; }; I: M& |
<i>clamp NMOS's ability.
" @( w" {& ]' Y* C' p<ii>clamp NMOS's turn-on rate.
+ r6 ~/ F+ L @8 [8 w% L2 {/ Y<iii>Not follow design rule.......................6 ?' [" a, ^' H$ v
As we know ,RC-control is to keep clamp NMOS off when IC is on normal operation.(us)# k: Q q+ p3 Z. P* k" E( s6 j
When sufferred ESD pulse(ns),GGNMOS be turned on by coupling .
. \/ e7 D Y9 [If adding inverter between RC and clamp NMOS,it will speed up clamp NMOS turned on.
: ]' Y6 H: T/ y4 O1 w; ^/ mJust for reference !!! |
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發表於 2010-5-10 14:38:41
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