The SN74LS194AN is a bidirectional universal Shift Register designed to incorporate virtually all of the features a system designer may want in a shift register. The circuit contains 46 equivalent gates and features parallel inputs, parallel outputs, right-shift and left-shift serial inputs, operating-mode-control inputs and a direct overriding clear line. Synchronous parallel loading is accomplished by applying the four bits of data and taking both mode control inputs, S0 and S1, high. The data are loaded into the associated flip-flops and appear at the outputs after the positive transition of the clock input. During loading, serial data flow is inhibited. Shift right is accomplished synchronously with the rising edge of the clock pulse when S0 is high and S1 is low. serial data for this mode is entered at the shift-right data input. When S0 is low and S1 is high, data shifts left synchronously and new data is entered at the shift-left serial input.
● Parallel inputs and outputs
● Synchronous parallel load operating mode
● Right shift operating mode
● Left shift operating mode
● Do nothing operating mode
● Positive edge-triggered clocking
● Direct overriding clear
