|
For ESD test (HBM)
6 X' T$ n' W. E/ o9 n% H' K9 Q" zThe following are the test combination:* M# R0 s2 S+ A7 R+ n7 r
1. Power to Power/ z: Y% Q9 l9 d$ }- o
2. Power to Ground
" M! g+ S: ]( W4 D3. IO to Power
+ N: }) c5 F& x1 f* h6 a4. Io to Ground' |1 X. w3 a& I6 m! B% b C
5. IO to IO. s$ ~" l9 [) T5 B
(different power domain need to be treated as different power. For ground usually you can treat as one group_silicon use substrate as common ground. But if you measure two different ground pin/ball > 2ohms. It should be seperated as 2 grond.)
4 Q: \9 q* r/ C( W0 w$ k- p% ^, j6 c% A. y' C" w, ~$ h7 N: Y& k
the total zap time fomula will be~ 2(+/- polarity) X (IO#X(P#+G#)+IO#+P#X(P#-1)X(P#-2)X...X1+P#XG)
+ q# e: j4 b% @0 k! B" VFor example: You have IO1/IO2/IO3/P1/P2/G1
7 @9 d" B$ k0 x9 n# k2x((3X(2+1)+3+2X1+2X1)=25(multiple the zap interval)
# p: U) K" U' X8 TSo for high pin count it will take a lot of time. But it won't take more than a week(for one chip).
# }" t3 Y" z. B. p. |; M4 t( o' j- n' `
For your reference. |
|