The HD74LV166A is 8-bit shift register with an output from the last stage. Data may be loaded into the register either in parallel or in serial form. When the Shift/Load input is low, the data is loaded asynchronously in parallel. When the Shift/Load input is high, the data is loaded serially on the rising edge of either clock inhibit or Clock. Clear is asynchronous and active-low. The 2-input NOR clock may be used either by combining two independent clock sources or by designating one of the clock inputs to act as a clock inhibit. Low-voltage and high-speed operation is suitable for the battery-powered products (e.g., notebook computers), and the low-power consumption extends the battery life.