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Per my experience ,Diodes + RC-Control , inverter and PowerClamp is better for out pad
1 z1 ^1 c( o( J* k! bGenerally speaking ,the root cause of ESD failed is from below.
5 V" I" p, K, D8 a<i>clamp NMOS's ability.
9 h) Z3 k9 P6 X# y<ii>clamp NMOS's turn-on rate.
! |+ l$ P1 V" b S6 E1 [: f<iii>Not follow design rule......................./ ]5 e0 G- E7 d* L9 B3 e/ e
As we know ,RC-control is to keep clamp NMOS off when IC is on normal operation.(us). [3 t$ M, q2 g" e1 x
When sufferred ESD pulse(ns),GGNMOS be turned on by coupling .8 r }# w9 Q a9 ]8 |( v
If adding inverter between RC and clamp NMOS,it will speed up clamp NMOS turned on.3 @: C" w$ J$ f
Just for reference !!! |
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發表於 2010-5-10 14:38:41
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