74AC74ACT

74AC74ACT is a dual D-type flip-flop device in the 74 logic family, designed for synchronous data storage and timing applications. It consists of two identical D-type flip-flops that capture the value on the rising edge of the clock input. Each flip-flop provides independent Q and Q-bar outputs, allowing both true and complementary outputs to be used in circuits. The device includes asynchronous preset (PRE) and clear (CLR) inputs, which are typically active-low, allowing the corresponding Q outputs to be set to a defined state independently of the clock.

In operation, the data present at each D input is sampled on the rising edge of its clock, and then reflected at the corresponding Q outputs until the next clock edge. The asynchronous PRE and CLR inputs enable immediate forcing of the outputs to a known state (set or reset) regardless of clock activity, with PRE generally setting Q to high and CLR resetting Q to low when asserted.

Electrical characteristics and supply: 74AC74 and 74ACT74 devices are CMOS parts and are designed to operate within the voltage ranges specified by their respective datasheets. Exact operating voltages, input thresholds, and drive capabilities vary by variant and package, so engineers consult the manufacturer’s documentation for precise figures. These parts are valued for low power consumption and relatively fast switching, suitable for high-speed logic circuits and timing networks.

Pinout and packaging: These flip-flops are commonly available in 14-pin packages such as DIP or small-outline variants. Each flip-flop has D, CLK, PRE, CLR inputs and Q, Q-bar outputs; the two flip-flops share a common clock but have independent data and asynchronous controls. Power and ground pins are standard for CMOS logic devices.

Applications: used in data storage, shift registers, counters, state machines, and timing circuits where reliable edge-triggered storage and flexible asynchronous control are required.