74LCX574SJ

Overview

The Fairchild Semiconductor 74LCX574SJ is a high-performance octal D-type flip-flop with 3-state outputs, belonging to the low-voltage CMOS 74LCX logic family. It features a single data input and eight parallel outputs, designed for applications requiring high-speed data storage and transfer. The device operates within a supply voltage range of 2.0V to 3.6V, ensuring compatibility with modern low-power systems while maintaining robust noise immunity. Packaged in a 20-SOIC (0.295", 7.50mm Width) surface-mount format, it supports industrial temperature ranges from -40°C to 85°C. Key electrical characteristics include a maximum propagation delay of 10ns at 3.3V and output drive capabilities of 24mA for both high and low states, facilitating efficient interfacing with various digital components.

Feature Summary

• Octal D-type flip-flop architecture with positive-edge triggering for reliable data capture
• Three-state outputs enable direct bus connections without additional control logic
• Advanced CMOS technology ensures low power dissipation alongside high-speed operation
• 5V tolerant inputs allow seamless interface between 3.3V devices and 5V systems

Applications

• Parallel-to-serial data conversion circuits
• Buffering and latching of address/data buses in microprocessor systems
• High-speed register files and memory interfaces
• Clock domain crossing synchronization stages

Procurement Notes

Verify the exact suffix 'SJ' against manufacturer documentation to confirm package dimensions and tape/reel specifications, as suffixes often denote specific packaging or environmental ratings. Ensure the sourcing channel provides traceability to Fairchild Semiconductor or authorized distributors to guarantee component authenticity. Cross-reference the datasheet revision date with your design requirements to confirm compliance with current RoHS standards and lead-free manufacturing processes. Confirm that the operating voltage range aligns with your system's power rail stability.

Selection Notes

Select this component when an octal storage element with tri-state capability is required for bus-oriented architectures. The 74LCX series is optimal for designs prioritizing low power consumption and fast switching speeds compared to standard HC or HCT families. Consider the 5V tolerant input feature if interfacing with legacy 5V logic levels while operating the core circuitry at 3.3V. Evaluate the 20-SOIC package size against available PCB real estate and thermal management constraints relative to alternative packages like TSSOP or SOIC-N.

Part Context

The 74LCX574 is part of Fairchild's extensive 74LCX logic portfolio, which focuses on low-voltage, high-speed performance for portable and battery-powered applications. This specific variant serves as a fundamental building block for sequential logic circuits, providing stable data retention and controlled output states. It complements other LCX devices like buffers and gates to form complete digital signal processing chains in consumer electronics and telecommunications equipment.

Replacement Considerations

Direct substitutes include the ON Semiconductor MC74LCX574MTCX or NEXPERIA 74LCX574D, provided the pinout and electrical characteristics match. Verify that any replacement maintains the same 3-state output configuration and 5V tolerant input specifications to ensure circuit compatibility without redesign.