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Author Topic: Substitution of an inverter IC: are they critical?  (Read 2650 times)

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Offline iamwhoiamTopic starter

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Substitution of an inverter IC: are they critical?
« on: May 04, 2012, 02:56:26 pm »
Hi there. I am building a parallel port flashing dongle for some old Nokia 5110/6150 phones, and on the schematic it specifies a "74HC14" hex inverter IC, but I have none, but DO have some other 74 series hex inverter (can't remember the number right now). I just wondered if you think it would be critical to get the specified model, at LPT port speeds?

Schematic:



Kind regards, Matt.
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Offline slateraptor

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Re: Substitution of an inverter IC: are they critical?
« Reply #1 on: May 04, 2012, 03:09:26 pm »
If the substitute device is HC or better, and based on the evidently simplistic design, I don't see any reason why there should be an issue.
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Offline firewalker

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Re: Substitution of an inverter IC: are they critical?
« Reply #2 on: May 04, 2012, 03:17:01 pm »
HC - High speed CMOS, similar performance to LS, 12 nS.

Alexander.
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Offline graynomad

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Re: Substitution of an inverter IC: are they critical?
« Reply #3 on: May 05, 2012, 03:26:29 pm »
The '14 is a Schmitt trigger, it will be more noise immune than say an '04. I doubt this will affect this application though.

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Rob
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Graynomad, AKA Rob Gray www.robgray.com
 
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