The MC74HC173 is identical in pinout to the LS173. The device inputs are compatible with standard CMOS outputs; with pullup resistors, they are compatible with LSTTL outputs. Data, when enabled, are clocked into the four D flipflops with the rising edge of the common Clock. When either or both of the Output Enable Controls is high, the outputs are in a highimpedance state. This feature allows the HC173 to be used in busoriented systems. The Reset feature is asynchronous and active high.