sorry for reposting. I just added some information about voltage rating of two ICs.
---- according to snipped-for-privacy@sunpoint.net :
Yes, you can. It's the number 7414 which tells the purpose of the chip.
The C-letter means it is cmos-type (and it needs to be in your circuit,
as you mentioned), and H means it is high-speed-type. It is not mentioned to be necessary in your circuit, but it is ok to use the high-speed type, although not necessary.
ps. according to the datasheet, 74HC14N is Hex Inverting Schmitt
> Trigger and 74C14 is Hex Schmitt Trigger.
Both ones are inverting. There are mistake, or maybe the maker of the datasheet of the 74C14 has considered the "invertingness" a "special feature" which wouldn't be necessary to tell on the header.
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From: Gerard Bok - view profile Date: Tues, Mar 28 2006 5:16 am Email: snipped-for-privacy@zonnet.nl (Gerard Bok) Groups: sci.electronics.repair Not yet ratedRating: show options
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Yes, you can. It's the number 7414 which tells the purpose of the chip.
>The C-letter means it is cmos-type (and it needs to be in your circuit,
>as you mentioned), and H means it is high-speed-type. It is not
>mentioned to be necessary in your circuit, but it is ok to use the
>high-speed type, although not necessary.
While you are right with the 'general picture' that it is the function that counts, you may well be wrong here :-)
Use in a C-meter, as the poster mentioned, is likely to be dependant on the Schmitt trigger's threshold. And that is one of specs that varies between different technologies :-)
-- Kind regards, Gerard Bok
thanks to replies. According to the datasheet the VCC of of C is higher
than HC part. In the capacitance meter i am planning to make, its supply voltage is 12 volts but 74hc14n VCC pin max is 6 volts only. That might be the problem. With the transistor tester using also 74c14,
its supply voltage is 6 volts. In this case, the 74hc14n might be suited as substitute but not in the capacitance meter with the supply voltage of 12 volts. (Because 74c14 has a Vcc ranging from 3.5-15 v but
74hc14n only up to 6 volts). Am I right?
tnx again,
ian