onsemi MC74HC574ADWG: A High-Performance Octal D-Type Flip-Flop for Modern Digital Systems

In the realm of digital logic design, the efficient management of data flow is paramount. The onsemi MC74HC574ADWG stands as a pivotal component in this domain, offering a robust solution for data storage, transfer, and bus interfacing. This integrated circuit is an Octal D-Type Flip-Flop with 3-State Outputs, engineered to meet the demands of high-speed, high-noise-immunity applications.

Constructed with advanced silicon-gate CMOS technology, the MC74HC574ADWG combines the low power consumption characteristic of CMOS with the speed and drive capability similar to LSTTL logic. The device features eight edge-triggered D-type flip-flops with individual D inputs and corresponding 3-state outputs connected to a common bus. A positive-edge-triggered clock (CP) input and an output enable (OE) input are provided to control the operation. On each low-to-high transition of the clock signal, the data present at the D inputs is stored and transferred to the outputs. The high-impedance state of the outputs is activated by a high logic level at the OE pin, which is crucial for preventing bus contention in shared bus architectures, a common requirement in microprocessor systems, memory address latches, and I/O port interfacing.

The MC74HC574ADWG is packaged in a DWG (SOIC-20 Wide) package, making it suitable for space-constrained PCB designs while ensuring reliable mechanical and thermal performance. Its wide operating voltage range of 2.0V to 6.0V provides significant flexibility across various system voltages, and its symmetrical output impedance ensures balanced rise and fall times. Furthermore, the device boasts high noise immunity due to its CMOS structure, a critical attribute for maintaining data integrity in electrically noisy environments.

A key application of this IC is in buffering and data registration between a microprocessor and a common data bus. The 3-state outputs allow multiple devices to be connected to the same bus lines without interference. When a device is not being actively read, its outputs enter the high-impedance state, effectively disconnecting it from the bus and allowing another device to drive the lines. This functionality is indispensable for building efficient, complex digital systems with shared resources.

ICGOODFIND: The onsemi MC74HC574ADWG is an exceptional choice for designers seeking a reliable, high-speed octal flip-flop. Its combination of CMOS low power, high drive capability, and 3-state bus-oriented outputs makes it an versatile and indispensable component for modern digital data routing and storage applications.

Keywords:

3-State Outputs, Octal D-Type Flip-Flop, Data Storage, Bus Interface, CMOS Technology.