The chip has a semi-circular gap or a small circle with a concave corner. Swing the chip with the gap or small circle facing upward, with the written side facing you. The pins of the chip are counted from the top down on your left hand side, pins 1 to 4, and pins 5 to 8 from the bottom up on the right hand side. That is, the arrow of the counterclockwise general circuit represents the direction of the current, or the connection.
PA input - output PB - PC0-2 - grounding PC3 output - input may be a negative feedback and so on.