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Per my experience ,Diodes + RC-Control , inverter and PowerClamp is better for out pad5 }' g9 a! O0 k% P. U2 c
Generally speaking ,the root cause of ESD failed is from below.1 Q" y& r0 E; w- m5 k
<i>clamp NMOS's ability.
2 w4 L9 M" C! U, }1 t8 ?<ii>clamp NMOS's turn-on rate.8 V5 D; j0 ]1 ], T( R: D
<iii>Not follow design rule.......................
0 ]6 @; k7 K7 u! aAs we know ,RC-control is to keep clamp NMOS off when IC is on normal operation.(us)
$ X, j; ~5 m, \- R# c8 ^. ?When sufferred ESD pulse(ns),GGNMOS be turned on by coupling .
* N- k6 ~3 g. r+ n& q/ e/ {* jIf adding inverter between RC and clamp NMOS,it will speed up clamp NMOS turned on.
' o# \9 a* f1 A8 U6 k+ ~Just for reference !!! |
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