74LS374

The 74LS374 is an 8-bit edge-triggered D-type flip-flop manufactured by ON Semiconductor. It is designed for applications requiring bus-driving capabilities, featuring 3-state outputs suitable for highly capacitive or low-impedance loads. This device integrates eight flip-flops within a single package, providing full parallel access for loading data.

The flip-flops are edge-triggered, meaning the Q outputs change state on the positive transition of the clock input. The 'LS374 includes buffered control inputs for reliable operation. The datasheet mentions that the 'S373 and 'S374 variants have Schmitt-trigger buffered inputs on the enable/clock lines, improving noise rejection by approximately 400 mV due to input hysteresis. An output control (OC) input allows the eight outputs to be placed in a normal logic state or a high-impedance state without affecting internal operations.

These characteristics make the 74LS374 particularly useful for implementing buffer registers, I/O ports, and bidirectional bus drivers in bus-organized systems. Its design avoids the need for external interface or pullup components when connecting directly to bus lines.