Unused DIN pins direct to 5V?

nebula · February 15, 2011, 2:07am

I am laying out a board with multiple DINs and DOUTs. I’m pretty sure I can do this, but thought I’d ask … can I connect unused DIN pins directly to the 5V rail with no resistor?

spongebob · February 15, 2011, 5:38am

Yes, you can. But you get the short circuit on first switching-on.

Of course you must connect 74HC165 pins to 5V through resistor.

T.K · February 15, 2011, 8:18am

No, there shouldn’t be a short circuit during power-on, because these pins are input-only (no drivers)

So: yes, just connect the unused inputs directly to 5V

Best Regards, Thorsten.