Supply voltage of HC is 2-6V and CMOS B is 3-15V. My thought is, a part rat= ed up to 15V suggests the transistors will have a pretty high on-resistance= running at 3V. Just look at the available output current at that supply vo= ltage - it's almost pitiful for CMOS B parts. The 4S584 specs at only 1mA a= t that voltage, and only 1.5mA at 5V. The HC/HCT parts don't have a rating = at 3V, but it's 4mA at 4.5V. Supply current should be correspondingly low o= n the 4S584. Cheerful regards, Bob ________________________________________ From: piclist-bounces@mit.edu on behalf of Russel= lMc=20 Sent: Friday, August 30, 2019 5:18 PM To: Microcontroller discussion list - Public. Subject: Re: [EE] Schmitt Trigger Icc? (current consumption in undefined = region) On Sat, 31 Aug 2019 at 06:58, Jason White wrote: > I am looking at the datasheet of the 74LVC2G17 " Dual non-inverting Schmi= tt > 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 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 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 View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist --=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 .