[SI-LIST] Power integrity / Transient current in Target impedance
- From: Saeed Bakhshi <saeedbakhshi@xxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Thu, 11 Dec 2003 01:13:17 -0800 (PST)
Hi
I have reviewed all si-list threads regarding to power integrity and decoupling
cap selection. all have said that there must be a target impedance and this
target impedance should be met up to several harmonics of existing clocks
frequencies ; and the target impedance is calculated using the below equation:
Target impedance= VDD x (Voltage tolerance) / "I_transient"
OK, But nobody explain how "I_transient" value could be calculated.
In all datasheets there is a ICC(current drawn from power supply) in absolute
maximum rating table. Is this ICC the same "I_transient"? or a fraction of ICC
should be used as "I_transient"?
What is the relationship between ICC mentioned in the "Absolute maximum rating
table of Chip datasheets" and the "I_transient" in target impedance formula?
any comment is appreciated.
Regards,
Saeed Bakhshi
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