74HC574 Octal D-Type Flip-Flop IC - 20-Pin DIP Package

When you are designing complex digital systems like DIY 8-bit computers or parallel data buses, you need a way to temporarily store a full byte of information. The 74HC574 is the absolute standard for organized 8-bit parallel data storage. This 20-pin integrated circuit contains eight D-type flip-flops. It loads all 8 bits of data simultaneously the exact moment it receives a rising signal on its Clock pin, locking the current inputs into memory.

What makes the 74HC574 vastly superior to older chips like the 74HC374 is its physical hardware layout. Older chips have their input and output pins alternating down both sides, making wiring messy and complex. The 74HC574 features a flow-through architecture where all eight input pins are lined up sequentially on one side of the chip, and all eight output pins are lined up directly across from them on the opposite side. This allows for incredibly neat, straight-line wiring in your logic projects.

Like all proper bus interfacing chips, it features 3-state outputs controlled by an Output Enable pin. When this pin is pulled High, the chip enters a High-Impedance state, physically disconnecting its outputs so other chips can transmit on the shared data bus without causing fatal short circuits.

Key Features & Functional Advantages

• Organized Flow-Through Pinout: Makes custom PCB routing and breadboard wiring clean and intuitive.

• 8-Bit Parallel Operation: Captures and stores a complete byte of data instantly across 8 parallel lines, far faster than serial shift registers.

• Positive Edge-Triggered: Mechanism ensures data is saved exactly on the rising edge of the clock signal for precise system synchronization.

• 3-State Outputs: Provides a High-Impedance mode allowing you to tie the outputs of multiple chips directly to the same shared system data bus safely.

• High-Speed CMOS Architecture: Delivers rapid switching speeds while maintaining ultra-low power consumption across a wide 2.0V to 6.0V operating range.

Perfect For

• Homebrew 8-Bit Computers: Where you need to build the accumulator, B register, or instruction register.

• Data Bus Buffering: To safely hold and isolate data from a microcontroller before broadcasting it to a shared main system bus.

• Parallel I/O Expansion: To grab an 8-bit snapshot from a parallel port and hold it steady to drive displays or digital-to-analog converters.

• Hardware State Machines: Requiring reliable, synchronized clocking for multi-bit data structures.

Technical Specifications

• Logic Family: 74HC High-Speed CMOS

• Logic Function: Octal D-Type Edge-Triggered Flip-Flop

• Number of Bits: 8

• Trigger Type: Positive Edge

• Output Type: 3-State Tri-State capable

• Operating Supply Voltage: 2.0V to 6.0V DC

• Package Case: 20-DIP 0.300 inch width

• Mounting Type: Through-Hole

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