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Per my experience ,Diodes + RC-Control , inverter and PowerClamp is better for out pad
$ o, S# n% q0 q L7 n( AGenerally speaking ,the root cause of ESD failed is from below.
8 X) U- Q. D1 z) L5 S$ Y v<i>clamp NMOS's ability." ]) R* W0 F; w! A
<ii>clamp NMOS's turn-on rate., y: }( b/ v4 v
<iii>Not follow design rule.......................
J" d. \) ^1 ]& qAs we know ,RC-control is to keep clamp NMOS off when IC is on normal operation.(us)
( e! j4 H: {) s, j4 [4 |When sufferred ESD pulse(ns),GGNMOS be turned on by coupling .
( \, |+ @9 N& u7 ?; Q/ T, ]If adding inverter between RC and clamp NMOS,it will speed up clamp NMOS turned on.! ]# i8 c3 D$ g. F
Just for reference !!! |
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