The gated serial inputs permit complete control over incoming data as a low at either input inhibits entry of the new data and resets the first flip-flop to the low level at the next clock pulse. A high-level input enables the other input, which then determines the state of the first flip-flop. Data at the serial inputs can be changed while the clock is high or low, provided the minimum setup time requirements are met. Clocking occurs on the low-to-high-level transition of the clock (CLK) input. The SN54LV164A is characterized for operation over the full military temperature range of 55C to 125C. The SN74LV164A is characterized for operation from 40C to 85C. FUNCTION TABLE