onsemi MC74VHC574DTR2

MC74VHC574DTR2 Series by onsemi Product Summary

The MC74VHC574DTR2 series, offered by onsemi, represents an advanced family of high-speed octal D-type flip-flops with 3-state output capability. This series is designed using silicon gate CMOS technology, delivering performance that rivals Bipolar Schottky TTL devices while benefiting from the low power dissipation characteristic of CMOS logic.

The MC74VHC574DTR2 series covers both the MC74VHC574 for standard CMOS logic levels and the MC74VHCT574A for tight TTL compatibility and level translation applications. Available in compact 20-TSSOP (Thin Shrink Small Outline Package) and SOIC-20 packages, these devices are well-suited for high-density PCB designs in modern digital and mixed-signal systems. Each device integrates eight D-type flip-flop elements, optimized for clock-driven data storage and logic output with selectable high-impedance states via output enable control.

Main Attributes and Functionalities of MC74VHC574DTR2

The MC74VHC574DTR2 series is engineered for speed and versatility. Notable features include maximum clock frequencies up to 180MHz (typical at V_CC = 5.0V for VHC variants) and low static power consumption, with an ICC of just 4.0μA (max, TA=25°C). The output enable function allows designers to implement bus-oriented data paths, providing high impedance outputs for improved system flexibility.

These flip-flops support interface voltage tolerances up to 5.5V on input pins, allowing seamless integration between 3V and 5V subsystems. The MC74VHCT574A variant further excels in mixed-voltage environments by offering full 5V CMOS output swings and TTL input compatibility, making it ideal for bridging different logic standards.

Balanced propagation delays ensure predictable timing in complex digital designs, complemented by high noise immunity (V_NIH = V_NIL = 28%) and robust ESD protection (>2000V Human Body Model). The flip-flop architecture comprises three stages, including a buffer output, which delivers high stability and resistance to noise—essential for industrial and precision applications.

Power down protection features in the MC74VHCT574A mitigate risk during voltage transitions, supply dropout, battery backup, or hot-insertion system maintenance, safeguarding the device and associated circuitry in challenging operating scenarios.

MC74VHC574DTR2 Electrical Properties and Performance Details

The electrical performance of the MC74VHC574DTR2 series makes it suitable for high-speed logic applications. With typical maximum operating frequencies of 180MHz (VHC) and 140MHz (VHCT) at 5V, the devices provide ample bandwidth for data latching and synchronization tasks in high-throughput environments.

Noise margins are tightly controlled, and output voltage performance is maintained within specifications: V_OLP max 1.2V (VHC) and 1.6V (VHCT) with 50pF load capacitances at V_CC=5.0V, enabling reliable interfacing with downstream logic. The devices are validated against latchup conditions exceeding 100mA and are compliant with standard Pb-Free, Halogen-Free, and RoHS environmental standards.

In terms of reliability, the recommended operating voltage range is 2.0V to 5.5V for MC74VHC574 and 4.5V to 5.5V for MC74VHCT574A. Unused inputs must be securely tied to logic high or low levels to avoid floating states, which is a standard precaution in CMOS circuit engineering.

Physical Structure and Package Variations of MC74VHC574DTR2

The MC74VHC574DTR2 is provided in two mainstream surface-mount packages: the SOIC-20 and TSSOP-20. The TSSOP variant, measuring 0.173" (4.40mm) in width, prioritizes compactness for high-density PCB layouts. Both package types adhere to industry-standard dimensions and soldering strategies, facilitating automated assembly and compatibility with modern reflow processes.

Each package is detailed with clear markings including device codes, assembly locations, wafer lot, year, and work week, assisting traceability and quality assurance during sourcing and manufacturing. Pb-Free marking options and compliance with environmental standards ensure suitability for global deployment in eco-sensitive applications.

Usage Guidelines for MC74VHC574DTR2

Engineering teams deploying MC74VHC574DTR2 devices typically employ them in digital storage, synchronization, and bus-oriented logic systems. The octal flip-flop configuration allows simultaneous handling of 8-bit parallel data, which is essential for microcontroller bus buffering, memory addressing, data acquisition, and logic expansion modules.

Clock and output enable controls provide deterministic data transfer and multiplexing, while the 3-state outputs allow shared bus architectures without bus contention risks. Noise immunity, ESD robustness, and power down protection make these devices apt for harsh industrial, automotive, and telecom environments—especially where high reliability and performance are vital.

The multiple voltage tolerance and logic compatibility aspects make the MC74VHC574DTR2 series especially valuable in mixed-voltage and distributed control systems, supporting seamless migration or integration between legacy TTL and modern CMOS infrastructures.

Alternative or Substitute Models Comparable to MC74VHC574DTR2

For systems specifying MC74VHC574DTR2, engineers may consider compatible alternatives within onsemi's portfolio or from other established logic manufacturers. The MC74VHCT574A variant, also from onsemi, serves as a direct drop-in if TTL input compatibility or increased voltage translation capacity is required.

Other 74VHC574- and 74VHCT574A-compliant octal D-type flip-flops with similar pinouts and operating characteristics may be sourced from manufacturers such as Texas Instruments, Nexperia, and Toshiba, ensuring supply chain flexibility. When qualifying replacements, attention should be paid to propagation delay, voltage tolerance, package type, and output enable behavior to confirm seamless swap-in and maintain design integrity.

Conclusion

The MC74VHC574DTR2 octal D-type flip-flop series from onsemi delivers high-speed, low-power performance with robust features for modern digital designs. Its advanced CMOS architecture, versatile voltage compatibility, and extensive protection mechanisms position it as a cornerstone component for data latching and bus management in many electronic systems. With multiple packaging options and strong compliance with international standards, the MC74VHC574DTR2 series stands out as an essential choice for product selection engineers and procurement professionals seeking reliable logic solutions in demanding applications.