The eight flip-flops of the ACT11534 are edge-triggered D-type flip-flops. On the positive transition of the clock, the Q outputs are set to the complement of the logic levels at the D inputs. The ACT11534 is functionally equivalent to the ACT11373 except for having inverted outputs. An output-control input (OC) is used to place the eight outputs in either a normal logic state (high or low logic levels) or a high-impedance state. In the high-impedance state, the outputs neither load nor drive the bus lines significantly. The