I would look at using one of the micropower op-amps that Microchip make in = an SOT-23 package, with a couple of resistors to make a Schmitt trigger. Sh= ould be low current throughout the transition, and there are some that oper= ate down to 1.8V. -----Original Message----- From: piclist-bounces@mit.edu On Behalf Of Jason = White Sent: 31 August 2019 02:20 To: Microcontroller discussion list - Public. Subject: Re: [EE] Schmitt Trigger Icc? (current consumption in undefined re= gion) Gosh, I am not so sure about running at a mere 2.0V. What do you guys think of a NPN Darlington like the MMBTA28-7-F to ground w= ith a 100k resistor to 5v. I think am going to have to trade squareness for= low power consumption. The source is a slow moving 0 to 40v signal (with 10us 600v transients) tha= t can provide up to 10mA. So perhaps a 4.7k input resistor and a ferrite be= ad? On Friday, August 30, 2019, RussellMc wrote: > On Sat, 31 Aug 2019 at 06:58, Jason White <=20 > whitewaterssoftwareinfo@gmail.com> > wrote: > > > I am looking at the datasheet of the 74LVC2G17 " Dual non-inverting > Schmitt > > trigger with 5 V tolerant input" > > > > I have attached two graphs which I would like help interpreting. My > > question: do these graphs mean that current consumption goes up to=20 > > 12mA when the input signal is in the undefined region? > > > Apart from the "minor detail" of being inverters and not buffers, the > 74HC2G14 / 74HCT2G14 comes much closer to the transition currents that=20 > you desire. > Available drive current is in the order of 4 mA at Vcc =3D 5V. > Ye olde tech HC/HCT seems to still have some advantages (as Bob noted). > 2 x 2 input ANDs or 4 x inverters would provide 2 buffers if available. > > > https://assets.nexperia.com/documents/data-sheet/74HC_HCT2G14.pdf > > Icc peak for Vcc > > 0.2 / 0.6 mA low-high / high-low at Vcc =3D 5V > and > 60 / 80 uA at Vcc =3D 2V > > > Russell > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive=20 > View/change your membership options at=20 > http://mailman.mit.edu/mailman/listinfo/piclist > -- Jason White -- http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/chang= e your membership options at http://mailman.mit.edu/mailman/listinfo/piclis= t --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .