onsemi MC74AC574DW

MC74AC574DW Device Summary

The MC74AC574DW, manufactured by onsemi, is an advanced octal D-type flip-flop IC designed for use in high-speed, low-power digital systems. Operating as a crucial memory element in data storage and synchronization, the MC74AC574DW provides engineers with eight edge-triggered flip-flops, consolidated into a single 20-lead SOIC or TSSOP package. With strong driving capability and three-state bus outputs, it is an exceptionally versatile choice for data latching, buffering, and microprocessor system interfacing. Its design allows for efficient and reliable transfer of parallel data within microprocessor-controlled architectures, making it an essential building block in high-performance logic circuits.

MC74AC574DW System Structure and Working Principles

The MC74AC574DW consists of eight individual D-type flip-flops sharing a common clock (CP) and a unified Output Enable (OE) control. Data presented on the D inputs is sampled and stored on the rising (low-to-high) edge of the clock signal, ensuring precise synchronization of data capture within digital systems. The state preserved by each flip-flop becomes available on the respective Q outputs when OE is held LOW, enabling straightforward parallel data transfer.

The three-state outputs are designed for efficient bus-oriented applications: when OE is HIGH, all outputs enter a high-impedance state, allowing multiple devices to share the same output lines without contention. Notably, the operation of the OE control does not influence the stored data within the register itself—a key consideration for reliable memory applications. This edge-triggered, positive logic configuration ensures robust and deterministic operation in timing-critical designs.

Major Benefits of MC74AC574DW in Contemporary Electronic Design

The MC74AC574DW delivers a suite of features that optimize it for demanding digital environments:

Inputs and outputs positioned on opposite sides of the package significantly simplify PCB layout, particularly in data bus and microprocessor interface scenarios.

It functions effectively as both input and output port logic, providing substantial flexibility in system design.

Output drive capability supports sourcing or sinking up to 24 mA, suiting direct interfacing with TTL and CMOS logic families.

Incorporation of three-state outputs caters for shared data busses, minimizing unnecessary signal conflicts.

The MC74AC574DW is functionally identical to the MC74AC374 series but offers a different pinout, increasing substitution flexibility if redesign or routing optimizations are required.

The MC74ACT574 variant delivers TTL input compatibility, streamlining mixed-logic system integration, while Pb-free options support modern RoHS-compliant manufacturing processes.

MC74AC574DW Power and Timing Specifications

Designed for robust operation across a range of supply voltages, the MC74AC574DW delivers high-speed, low-power performance critical for modern electronics:

The device supports operation at both 3.3 V (±0.3 V) and 5.0 V (±0.5 V), accommodating diverse application voltage requirements.

The AC characteristics, including setup and hold times, as well as propagation delays, are tightly specified for both voltage ranges to guarantee timing integrity in synchronous designs.

DC characteristics ensure reliable logic-high and logic-low detection, with input and output leakage currents held to minimal levels for optimal quiescent performance.

Output drive strength enables direct connection to extensive loads or signal lines without additional buffering.

The MC74AC574DW’s electrical parameters are validated for worst-case scenarios (all outputs loaded), ensuring dependable operation even in heavily loaded configurations.

MC74AC574DW Physical Specifications and Package Details

The MC74AC574DW is available primarily in a 20-lead wide-body SOIC (Small Outline Integrated Circuit) package, with an alternative TSSOP (Thin Shrink Small Outline Package) form factor. Both options offer robust, industry-standard footprints ideal for automated assembly and high-density PCB layouts.

Precise mechanical tolerances and standardized pin assignments promote ease of integration and automated placement.

The packages are fully compatible with Pb-free soldering processes, respecting the environmental and reliability standards expected in contemporary production lines.

Dimensions, terminal allocations, and recommended soldering footprints adhere strictly to JEDEC and ASME standards, ensuring compatibility with broad industry expectations and enabling straightforward replacement or migration between similar devices and footprints.

MC74AC574DW Environmental Standards and Certification

The MC74AC574DW demonstrates strong compliance with industry regulations for safety, environmental protection, and global trade:

Moisture Sensitivity Level (MSL) rating of 1 allows unrestricted storage and handling in standard assembly environments.

The device meets the requirements for Pb-free (lead-free) assembly and is available in compliance with global RoHS directives.

The EAR99 ECCN classification assures simple exportability for most international trade scenarios, easing procurement planning for global projects.

Alternative/Substitute Options for MC74AC574DW

When designing for flexibility or when ensuring supply chain robustness, engineers often need to consider alternative devices. The MC74AC574DW is functionally identical to the MC74AC374 and 74ACT574 series—differing mainly in pinout or input logic level compatibility. Accordingly, direct replacements may include:

MC74AC374 from onsemi, for functionally equivalent designs that require different pin configurations.

MC74ACT574, also from onsemi, for applications needing TTL-compatible inputs.

Equivalent offerings from other vendors may exist under similar nomenclature (e.g., 74AC574), subject to careful review of the pinout, timing, and electrical specifications.

Ensuring compatibility involves verifying supply voltage range, timing parameters, and package footprint alignment to prevent unanticipated integration issues. Substitution choices should also consider long-term availability, supplier quality, and package options to maintain supply chain resilience.

Conclusion

The MC74AC574DW by onsemi stands as a robust, high-speed octal D-type flip-flop solution tailored for engineers tasked with implementing reliable data storage and bus control in modern digital designs. With its versatile features, precise timing performance, and broad compliance credentials, the MC74AC574DW is equally suited for new designs or drop-in replacement contexts. Procurement professionals and design engineers seeking a stable, future-ready component for synchronous data transfer applications will benefit from the clarity, reliability, and flexibility that the MC74AC574DW brings to advanced logic system architectures.