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From: "Anthony Q. Bachler"
Subject: Re: True output current capability of 4000 series CMOS
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
Date: Mon, 20 Jan 2003 06:56:10 -0600
NNTP-Posting-Date: Mon, 20 Jan 2003 07:56:55 EST
actual performance varies, the spec sheet just lists the min/max tolerances
that the manufacturer guarantees it will operate with the guaranteed MTBF.
Typically the spec sheet lists what 99.999% of the chips test. 80% of the
chips may be able to sink/source 25 mA but if 99.999% can source 1 mA tent
he spec sheet gets 1 mA as the rating rather than throw away 20% of the
production. I certainly would NOT design commercial circuits using anything
outside the spec sheet though, as you are guaranteed over a production run
to get a few of the chips that barely meet specs.
"If a million people say a foolish thing, it is still a foolish thing."
Anatole France [Jacques Anatole Thibault] (1844-1924)
"Gibbo" wrote in message
> "cpemma" wrote:
> >But a 4017 or 4060 (on 9-12v) seems to drive leds happily at 10mA or
> >more - a duty cycle factor? I note NS spec 4017 max power dissipation as
> >700mW (dil) which leaves room for several mA flowing somewhere ;)
> Yeah that's why I posted the query. This circuit my techie built has had
> gate driving an LED at around 20mA on 50/50 duty cycle and 4 other gates
> driving LEDs at around 10mA for over 2 years. That in itself is remarkable
> one of the gates on the first chip is actually powering the second chip
> is then sourcing 10mA 100% plus 20mA on 50% duty cycle.
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