NE555 versus TLC555 ??
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Posted by Dave, I can't do that on August 3, 2008, 2:35 pm
Please log in for more thread options I have a circuit that calls for TLC555 and I have about a zillion NE555. Why couldn't I use the NE in place of the CMOS version? Thanks Dave | ||||||||||||||||||||||||||||||||||||||||||||||
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Posted by Tom Biasi on August 3, 2008, 3:15 pm
Please log in for more thread options I don't know why, I can't see your circuit. NE needs 5 Volts and has a lower Fmax. if that matters. Tom | ||||||||||||||||||||||||||||||||||||||||||||||
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Posted by Tim Wescott on August 3, 2008, 3:56 pm
Please log in for more thread options Tom Biasi wrote:
>> Hi,
>> >> I have a circuit that calls for TLC555 and I have about a zillion >> NE555. >> >> Why couldn't I use the NE in place of the CMOS version? >> >> Thanks >> >> Dave >
And the TTL version's output won't necessarily go all the way up to 5V,
> I don't know why, I can't see your circuit. > NE needs 5 Volts and has a lower Fmax. if that matters. > > Tom > or even be symmetrical about 2.5V. At least one of the 555 circuits suggested recently in this group depended on the property of CMOS 555's to go all the way to 0V and VCC (and the poster said as much). So, post the circuit somewhere, and post a link here, and let us take a look. -- Tim Wescott Wescott Design Services http://www.wescottdesign.com Do you need to implement control loops in software? "Applied Control Theory for Embedded Systems" gives you just what it says. See details at http://www.wescottdesign.com/actfes/actfes.html | ||||||||||||||||||||||||||||||||||||||||||||||
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Posted by John Fields on August 3, 2008, 3:21 pm
Please log in for more thread options On Sun, 3 Aug 2008 11:35:17 -0700 (PDT), "Dave, I can't do that"
>Hi,
> >I have a circuit that calls for TLC555 and I have about a zillion >NE555. > >Why couldn't I use the NE in place of the CMOS version? --- It depends on the circuit. Post it somewhere and let's have a look. JF | ||||||||||||||||||||||||||||||||||||||||||||||
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Posted by Bob Monsen on August 3, 2008, 5:49 pm
Please log in for more thread options > Hi,
> > I have a circuit that calls for TLC555 and I have about a zillion > NE555. > > Why couldn't I use the NE in place of the CMOS version? > > Thanks > > Dave You can use them! Why not? The differences are: 1) they probably don't have 'rail-to-rail' outputs 2) they use about 100 times as much power 3) they require lots more current to trigger 4) they have a slightly lower Vmax 5) NE555 will drive more current on the output Regards, Bob Monsen | ||||||||||||||||||||||||||||||||||||||||||||||
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>
> I have a circuit that calls for TLC555 and I have about a zillion
> NE555.
>
> Why couldn't I use the NE in place of the CMOS version?
>
> Thanks
>
> Dave