Teensy 3.6 whit 74hc595 - Pinout and power

[Lenogi]

I think 74HC595 is the wrong chip for this application. It has to do with the minimum input high voltage for 74HC595 pins.
The minimum input voltage is calculated with 0.7 * Vcc. With 5V supply, the input voltage should be > 3.5V but the max output from a Teensy 3.6 is 3.3V.

74HCT595 (Nexperia/ Diodes inc.) or 74AHCT595 (Texas Instruments) is the recommended type. The minimum input high voltage for these is 2.0V.

Thanks!
I'm going to read the datasheet.

 

[PaulStoffregen]

FWIW, the 74HC595 chips I originally used for testing happen to work with 3.3V signals. Most of them do, even though it's technically not guaranteed according to the worst case specs.

74HCT is of course the best way.