NXP 74HC574DB: Octal D-Type Flip-Edge Flip-Flop with Tri-State Outputs and High-Performance Silicon-Gate CMOS Design

The NXP 74HC574DB is a highly integrated octal positive-edge-triggered D-type flip-flop that exemplifies the efficiency and performance of modern high-performance silicon-gate CMOS technology. Designed for a broad range of digital applications, this IC is an essential component for systems requiring temporary data storage, bus interfacing, and data transfer synchronization.

A key feature of the 74HC574DB is its octal (8-bit) design, which allows it to handle a full byte of data simultaneously. Each of the eight flip-flops captures the data present at its D-input at the low-to-high clock (CP) transition, storing it until the next rising clock edge. This synchronous operation is crucial for maintaining timing integrity in complex digital circuits, such as microprocessors and data communication systems.

Another defining characteristic is its tri-state outputs. The Output Enable (OE) pin provides direct control over the output buffers. When OE is set to a logic high, the outputs are forced into a high-impedance state (Hi-Z), effectively disconnecting the flip-flop from the bus. This feature is indispensable for bus-oriented systems, where multiple devices must share a common data line without interference, preventing bus contention and facilitating efficient bidirectional data flow.

The device is built with advanced silicon-gate CMOS technology, which offers a superior blend of low power consumption and high noise immunity. It operates over a wide voltage range, typically from 2.0 to 6.0 V, making it compatible with various logic families. Furthermore, it can drive up to 15 LSTTL loads, demonstrating its robust output drive capability.

Housed in a standard SSOP-20 (DB) package, the 74HC574DB offers a compact footprint, making it suitable for space-constrained PCB designs. Common applications include use as data registers, input/output ports, and as an interface buffer between a microprocessor and shared data buses.

ICGOOODFIND: The 74HC574DB from NXP is a versatile and reliable solution for synchronous data storage and bus interfacing, combining low power, high speed, and essential tri-state control in a single, compact package.

Keywords: Tri-State Outputs, Octal Flip-Flop, Positive-Edge Triggered, High-Impedance State, Silicon-Gate CMOS