[sdiy] 74LVC characteristics

[Ullrich Peter]

Hi Tim!

Yes, both the 74LVC1G14 and 74LVC2G14 but also the 14pinner 74LVC14 are nice parts.

I like the LVC series in general as they are 5V tolerant (this is why they miss the limiting diodes to the VDD rails on the inputs).
They need another protection scheme that is said to be more expensive than the simple diode protection.

The schmitt trigger inputs often help to improve the "quality" of the input signals as clear thresholds and hysteresis values
can reduce noise on signals.
Yes the input currents are quite low so high value resistsors can be used for pullups or pulldowns if needed.

Another benefit is the voltage range from 1.65 to 5.5V.
Not to forget the strong output drive of +/- 24mA.

You just should have a look if the speed of these chips is enough. Propagation delay can go as high as 12ns (worst case).
For simple circuits it is normally no problem - just take care of your needs.

Ciao
Peter

http://www.ullrich.at.tt
________________________________________
Von: Synth-diy <synth-diy-bounces at synth-diy.org> im Auftrag von Tim Ressel <timr at circuitabbey.com>
Gesendet: Mittwoch, 24. Oktober 2018 23:43
An: SYNTH DIY
Betreff: [sdiy] 74LVC characteristics

Hi,

i am looking at the 74LVC2G14. It is my go-to for buffering inputs. In
the past i would use a dual shottky diode and limiting resistor as
protection. But looking at the datasheet it seems the diodes are not
needed. Also the current draw on an input is super low at 5uA. This
means I can use a rather high value limiting resistor yes? This would
simplify the design a bit.

--
--Tim Ressel
Circuit Abbey
timr at circuitabbey.com

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