Subject: IBIS parameters..

From: [email-masked] (Syed Huq)
Date: Wed, 6 Jul 94 09:23:14 PDT

Hi,
	Some questions about the IBIS parameters:

	When we specify R_pkg, Do we really mean the Resistance of the pin or 
	the Impedence of the pin. This makes a lot of difference
	in calculation of R_pkg. Impedence is an easy calculation(based on L & C)
	but something like Resistance needs Bond wire length, Area of wire, 
	resistivity of the wire etc to get R_pkg.

	Any idea how someone gets these R_pkg numbers. Don't say from the 
	packaging group !!

	Also, the C_comp. How does one measure this ? I know of measuring this
	using TDR method and comparing with known capacitance curves but that
	is not too straight forward. Any ideas !!

Regards,
Syed Huq
National Semiconductor Corp.