Re: [SI-LIST] : Terminating a bi-directional bus

Roy Leventhal (Roy_Leventhal@mw.3com.com)
Mon, 3 May 1999 16:22:23 -0500

Shayle,

My opinion is that you're better off with lower voltage swing devices, provided
you don't give up too much on inherent noise margin set by Vil-Vih.

I would think the same signal integrity principles apply whatever the Vcc swing.
But, remember v=iR, v=Ldi/dt and i=Cdv/dt here. So, you have more energy
available to drive through your parasitic couplings, into non-ideal grounds,
pull out of non-ideal power planes, etc. All of which is intrinsically harder to
control.

Secondly, you will have more of a problem with power density making it more
difficult to get to the benefits of shrinking dimensions to combat SI problems.

Regards,

Roy Leventhal

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