The 74HC564 is a high-speed Si-gate CMOS device from NXP Semiconductors, renowned for its reliability and performance in a wide range of digital applications. This integrated circuit is part of the 74HC family, which is well-known for its compatibility with TTL (Transistor-Transistor Logic) levels, making it suitable for interfacing with older technology as well as for use in modern digital systems.

Key Features

• Octal D-type Flip-Flops: The 74HC564 contains eight edge-triggered flip-flops, with all flip-flops sharing the same clock and reset inputs, making it ideal for implementing synchronous state machines and buffer registers.
• Inverted Outputs: Each flip-flop has an inverted output, allowing for direct drive capability of LED displays or other inverting logic without the need for additional inverters.
• 3-State Outputs: The outputs of the 74HC564 are three-state, meaning they can be set to high, low, or high-impedance. This feature is particularly useful for implementing bus-oriented systems as it allows multiple outputs to be connected to a common bus without interference.
• Positive-Edge Triggering: The positive-edge triggering of the flip-flops ensures that data is stable and reliable, as changes on the data lines will only be registered on the rising edge of the clock signal.
• Master Reset: The inclusion of a master reset input allows for the synchronous reset of all flip-flops, providing a convenient way to clear the register and start from a known state.

Applications

The 74HC564's versatility makes it suitable for a variety of applications, including:

• Buffer registers
• Control registers
• State machines
• Bus-oriented systems

Technical Specifications

With a wide operating voltage range from 2.0 to 6.0 V and a low power consumption, the 74HC564 is designed for optimal efficiency in both commercial and industrial environments. It also features a high noise immunity and is compatible with JEDEC standard no. 7A requirements.

Conclusion

The NXP 74HC564 Octal D-type flip-flop with 3-state inverted outputs is a robust and versatile component suitable for a multitude of digital applications where reliable data storage and transfer are required. Its compatibility with TTL levels, along with its three-state outputs, make it a valuable addition to any digital system designer's toolkit.