Re: [SI-LIST] : BusHolders: still necessary if SI mananged properly ?

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From: D. C. Sessions (dc.sessions@vlsi.com)
Date: Tue Nov 09 1999 - 08:53:29 PST


Daniel Roganti wrote:
>
> ALL,
>
> I have a question about Bus holders in regards to their necessity,
> If I make an effort to control/manage the signal integrity on a controller
> platform,
> Would there be a strong need to still use Bus Holders for the TriState buses ?
> I wonder if these are used frequently in other controller platform designs on
> the market.
> At the moment I'm looking at ways to save real-estate by using TSSOP packages.

Bus holders aren't intended as dynamic clamps. They generally have high-kohm
impedances -- hardly adequate for damping. Their purpose is to keep the bus
in a defined logic state so that inputs don't exhibit high crowbar currents
during bus float.

BTW, *please* don't post the animated graphics. They pretty near locked
up my 56k dialup line at home.

-- 
D. C. Sessions
dc.sessions@vlsi.com

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