Alt-BEAM Archive
Message #03897
To: "'beam@sgiblab.sgi.com'" beam@sgiblab.sgi.com
From: Wilf Rigter Wilf.Rigter@powertech.bc.ca
Date: Fri, 28 May 1999 15:55:19 -0700
Subject: [alt-beam] Re: What Tilden calls it.....
oops the first reply took so long to get to the list I thought it was lost.
So I send a second (slightly revised with some quantitative info thrown in).
Sorry.
Wilf Rigter mailto:wilf.rigter@powertech.bc.ca
tel: (604)590-7493
fax: (604)590-3411
> -----Original Message-----
> From: Wilf Rigter [SMTP:Wilf.Rigter@powertech.bc.ca]
> Sent: Friday, May 28, 1999 2:48 PM
> To: beam@sgiblab.sgi.com; 'zozzles@lanl.gov'
> Subject: RE: What Tilden calls it.....
>
>
> Hi John,
>
> A dazzling display of Beam robological slight of hand you say?
>
> This is a problem in particular for 74HCT240 chips with offset logic
> thresholds with the resulting timing cycle triggered alternately from the
> positive slope lower threshold (~1V) of each inverter for a 1:1 dutycycle.
> When one resistor is removed the timing is triggered by the negative slope
> upper and positive slope lower thresholds changing the duty cycle to 1:4 !
>
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