74LCX574BQX

Overview

The Fairchild Semiconductor 74LCX574BQX is an octal D-type flip-flop with 3-state outputs, belonging to the 74LCX logic series. It operates within a supply voltage range of 2V to 3.6V and features low ON-resistance for reduced signal distortion. The device is housed in a 20-DQFN package with an exposed pad, designed for surface-mount installation. It supports data storage on positive clock edges and includes asynchronous reset functionality.

Feature Summary

• Octal D-type flip-flop architecture providing eight independent data storage elements
• Three-state outputs allowing direct connection to bus lines without external buffers
• Asynchronous reset input to clear all flip-flops independently of the clock signal
• Low ON-resistance output structure minimizing signal distortion during transmission

Applications

• High-density memory interface circuits requiring parallel data latching
• Bus-oriented systems utilizing three-state output control for line sharing
• Clock buffering and timing alignment in digital communication modules
• General-purpose register applications in embedded controller designs

Procurement Notes

Verify the specific suffix 'BQX' against the manufacturer's current product status, as availability may vary between original Fairchild Semiconductor documentation and subsequent onsemi production updates. Confirm RoHS compliance and lead-free specifications directly with the supplier or authorized distributor prior to ordering. Ensure the 20-DQFN package dimensions match the target PCB footprint requirements exactly.

Selection Notes

Select this component when designing systems requiring octal data storage with low voltage operation between 2V and 3.6V. The 3-state output capability makes it suitable for bus-driven architectures where multiple devices share common data lines. Consider the 20-DQFN package for space-constrained applications needing thermal dissipation through the exposed pad. Compare propagation delays and output drive strength against system timing requirements to ensure signal integrity.

Part Context

This part belongs to the 74LCX family of low-voltage CMOS logic devices, characterized by fast switching speeds and wide operating voltage ranges. The 74LCX574 variant specifically provides octal D-type flip-flop functionality, distinguishing it from simpler buffer or gate components within the same series. It serves as a fundamental building block for sequential logic circuits in modern digital electronics.

Replacement Considerations

Cross-reference with other manufacturers offering equivalent octal D-type flip-flops in 20-DQFN packages. Verify pinout compatibility and electrical parameter equivalence, particularly regarding supply voltage limits and output drive capabilities, before substituting.