[SI-LIST] Re: 8-layer PCB stackup

Neither are optimum!
Stackup A  has current return paths for all signal layers but has little
capacitance for the +5V layer which I presume is where most the fast
edge currents are.
Stackup C: Might be a better solution using the TOP layer to
interconnect +12V islands


1 Signals
2 GND
3 Signals
4 +5V/+12V
5 GND
6 Signals
7 GND
8 Signals

Stackup C: Might be a better solution using the TOP layer to
interconnect +12V islands

Steve Salkow
Lockheed Martin
3200 Zanker Road
San Jose, CA 95134
(408) 473-4058 (san Jose)
(408) 742-4162 (Sunnyvale)
steven.salkow@xxxxxxxx
salkow@xxxxxxxxxxxx
(925) 462-1075 Home
(925-) 487-5946 Cell
(408) 468-7271 Numeric Pager


-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Kevin Khuu
Sent: Thursday, June 24, 2004 9:07 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] 8-layer PCB stackup


Which of these two PCB stackups is better?


Stackup A:

1 Signals
2 GND
3 Signals
4 +5V
5 +12V
6 Signals
7 GND
8 Signals


Stackup B:
1 Signals
2 GND
3 +5V
4 Signals
5 Signals
6 +12V
7 GND
8 Signals

Thanks,
Kevin

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