The MC74VHC74D is an integrated circuit (IC) component that belongs to the VHC series of logic devices. It is a dual D-type flip-flop with preset and clear capabilities. The IC is manufactured by ON Semiconductor, a leading supplier of semiconductor-based solutions.
Key Features:
1. Dual D-Type Flip-Flops: The MC74VHC74D integrates two independent flip-flops, which can store a single bit of data each. These flip-flops are designed to operate on positive-edge-triggered clock signals.
2. Preset and Clear Inputs: It includes a preset (PRE) and clear (CLR) input for each flip-flop. The preset input sets the flip-flop's Q output to a logic high state (1) when enabled, while the clear input sets the Q output to logic low state (0) when enabled.
3. Common Clock Input: Both flip-flops share a common clock (CLK) input. When a positive-edge trigger is detected on the clock input, the flip-flops capture the data present at the D input and store it internally.
4. Asynchronous Inputs: The preset and clear inputs operate asynchronously, meaning they can override the clock signal's effect. As a result, the IC facilitates direct initialization of the flip-flop outputs to desired logic levels without depending on the clock input
