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Per my experience ,Diodes + RC-Control , inverter and PowerClamp is better for out pad; h4 }' E6 v# a( R. T1 `% ]% i
Generally speaking ,the root cause of ESD failed is from below.
* [5 F$ w, y7 H1 @! l' K3 N! E<i>clamp NMOS's ability.; |0 a* L( B9 k4 J* s0 k$ i' h. G
<ii>clamp NMOS's turn-on rate.
$ A* A% J9 n/ f( x9 z<iii>Not follow design rule.......................
! A! q9 x S- p4 r- I8 d9 a& xAs we know ,RC-control is to keep clamp NMOS off when IC is on normal operation.(us)4 s0 R' ^" \4 I/ S7 b
When sufferred ESD pulse(ns),GGNMOS be turned on by coupling .
$ [- m3 p) f# Q HIf adding inverter between RC and clamp NMOS,it will speed up clamp NMOS turned on.' }2 t$ s1 Z/ a x, G) O
Just for reference !!! |
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發表於 2010-5-10 14:38:41
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