Yes, 74HC393 should work fine on 3.3 V for power and inputs. Yes, unused inputs should be grounded or to +V, which ever is the disable for that pin. Through a resistor is best but not necessary.To make it more simple for myself I now use a 1hz pulse of the Arduino
By default pin 13 is GND (with a resistor between), but when the signal is high it is 5V (or 3.3V). Is that the correct way? Or is this shortage, and not good?
You are right. That is what that says. I don't think I have ever seen that limitation as a problem. So at 3.3 Volts rise and fall times must be quicker than about 750 ns / Volt, or about 2.5 us?Incorrect. If the rise/fall edge duration is longer than i already stated it WON'T trigger ( Clock ).
Yes, you can do at any frequency you want but the above statement must be met!
CD4511, cost about $0.50 from Jameco Electronics, is designed to drive a common cathode display. Yes, use resistors. The data sheet breaks down the internal circuitry into gates. It would take about 30 gates.Yes, with Arduino it counts correct. Unfortunately I don't have a binary to 7segment decoder, but maybe I will be able to build that myself sometime (I have 100 NPN transistors and 100 dual NAND gates ).
But for now it works!
Every day is a school day for all of usYou are right. That is what that says. I don't think I have ever seen that limitation as a problem. So at 3.3 Volts rise and fall times must be quicker than about 750 ns / Volt, or about 2.5 us?
Thanks for the lesson.
technically correct. How many times have you built a circuit and not used that capacitor?Yes, I realize this, but if you look at the data sheet for the HC393 part and are using a Vcc of 5v, the inputs must go above 70% of Vcc. The TTL version 74LS 393 would work just fine as its inputs only need to go to TTL levels. Also tie unused inputs for TTL Hi , not low and be sure never to try to pull them low with a resistor.
the pinout he describes is certainly the 74393. He references the 74HC393 specifically.It still isn't clear to me if the counter is 7493 or 74HC393...
See:Yes, 74HC393 should work fine on 3.3 V for power and inputs.