From: Jonathan Kirwan
Subject: Re: Roulette Wheel Project
References: <email@example.com> <firstname.lastname@example.org> <email@example.com>
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NNTP-Posting-Date: Sun, 29 Dec 2002 02:58:48 GMT
Organization: AT&T Broadband
Date: Sun, 29 Dec 2002 02:58:48 GMT
On Sat, 28 Dec 2002 20:12:08 GMT, Spehro Pefhany
>On 28 Dec 2002 11:31:19 -0800, the renowned Winfield Hill
>>> Winfield Hill wrote:
>>>> A quick note, the Scenix / Ubicom high-speed microprocessor
>>>> replacements for PICs have R(on) < 20-ohm sinking outputs.
>>> That's pretty nice, actually. Do you happen to know what the
>>> sourcing impedance is for them? And are all the outputs that
>>> way? Or just a few? (I'm remembering some of the PIC17 family
>>> which had '60mA rated' sinking outputs, but only a few.)
>> The spec is 0.6V max drop at 30mA sinking current, and it
>> applies to all the outputs. Actually, this is a rather
>> high resistance when compared to fast CPLD chips, etc.
>Not a factor here, but don't forget the limits on total current in/out
>of Vdd/Vss pins and per-port limits.
Indeed, but since we are only considering one and only one LED
on at a time for the roulette game, plus perhaps an indicator
LED, I think we're 'mostly' on safe ground.