+---+--+---+ +---+---*---------------+ /RST |1 +--+ 16| VCC | S1| S0| Function | D |2 15| Q0 +===+===*===============+ P0 |3 14| Q1 | 0 | 0 | Hold | P1 |4 40194 13| Q2 | 0 | 1 | Shift right | P2 |5 74194 12| Q3 | 1 | 0 | Shift left | P3 |6 11| CLK | 1 | 1 | Parallel load | L |7 10| S1 +---+---*---------------+ GND |8 9| S0 +----------+