Ic Chip Direction. A circle or dot next to pin 1. However a simple circuit uses a dual monostable.
Does this dot in any way correspond to where the notch should be. Ic pins are numbered in a counter clockwise fashion from pin 1. Qfp ics might have anywhere from eight pins per side 32 total to upwards of seventy 300 total.
Splaying ic pins out in all four directions gets you something that might look like a quad flat package qfp.
If the ic is sinking current it is flowing into the output. If you understood how to identify pin number 1 of a ic you can read all the rest. Scroll to continue with content. The various means to identify pin 1 include.
