raschemmel:
2- When interfacing the TC4427 to an arduino, if the output won't turn off, first try the easiest solution, which is a pulldown resistor on the output of the ATMega328 (the TC4427 input)
Don't you mean, manually apply 5V to the input, then measure the output, then apply Gnd to the input, and again measure the output? Verify that it complies with the following table:
| Input | TC4426 | TC4427 | TC4428 |
|---|---|---|---|
| IN A | ~OUT A | OUT A | ~OUT A |
| IN B | ~OUT B | OUT B | OUT B |
I don't understand what applying a "pull down" resistor achieves? If the Arduino output is compromised, then item #1 will catch that.