74ACQ574SC

Overview

The Fairchild Semiconductor 74ACQ574SC is an octal D-type flip-flop belonging to the AC/ACTQ series. It features positive edge-triggered data storage on the clock transition and includes a buffered common Output Enable (OE) input. The device provides true outputs with 3-state capability, allowing direct interface with microprocessors and bus-oriented systems. Packaged in a 20-pin SOIC format, it supports TTL-compatible inputs and offers high-speed operation with low power consumption characteristics typical of advanced CMOS technology.

Feature Summary

• Octal D-type flip-flop architecture with positive edge triggering for reliable data capture
• Three-state outputs controlled by a single buffered Output Enable input for bus compatibility
• TTL-compatible inputs ensuring seamless integration with standard logic families
• High-speed performance combined with low power dissipation suitable for portable applications

Applications

• Microprocessor memory address latching and data buffering
• General-purpose register implementation in digital control systems
• Bus-oriented data storage and transfer interfaces
• Parallel-to-serial conversion stages in communication modules

Procurement Notes

Verify the specific suffix 'SC' against the manufacturer's official datasheet to confirm package dimensions and pinout configuration. Ensure the component meets required operating temperature ranges and voltage specifications for the target application environment. Cross-reference the ordering information with current availability status as legacy components may have limited supply chains or alternative sourcing requirements from authorized distributors.

Selection Notes

Select this component when an octal register with three-state output control is required for high-speed digital designs. The AC/ACTQ series offers improved noise immunity and speed compared to standard AC devices. Consider the 20-pin SOIC package for surface-mount assembly constraints. Verify that the TTL-compatible input thresholds align with the driving logic family voltages to ensure proper signal integrity across the system interface.

Part Context

The 74ACQ574SC is part of the broader 74AC logic family, designed for high-speed CMOS applications. It shares functional similarities with the 74ACT574 but distinguishes itself through specific packaging and quality grades indicated by the Q suffix. This series is commonly used in computing and telecommunications equipment where fast switching speeds and low power consumption are critical design parameters for efficient system operation.

Replacement Considerations

Compatible substitutes include the SN74ACT574N from Texas Instruments and the MC74AC574D from onsemi. These alternatives offer identical logical functionality and pinouts. Verify that the replacement device supports the same 3-state output configuration and TTL-compatible input levels. Check for any differences in maximum operating frequency or output drive current if the application demands specific electrical performance margins.