74AC574SJX

Overview

The Fairchild Semiconductor 74AC574SJX is an octal D-type flip-flop featuring three-state outputs, housed in a 20-pin SOIC package. It operates within a voltage range of 2V to 6V and supports a maximum clock frequency of 100 MHz. The device provides high-speed performance with a propagation delay of 13 ns at 5V. It includes buffered Clock (CP) and Output Enable (OE) inputs common to all flip-flops, allowing data storage on the LOW-to-HIGH clock transition. The component is designed for bus-oriented applications with TTL-compatible inputs.

Feature Summary

• Octal D-type flip-flop architecture with separate D-type inputs for each stage
• Three-state outputs enabling efficient bus-oriented system designs
• Buffered Clock and Output Enable signals shared across all flip-flops
• TTL-compatible input levels for broad logic family interoperability

Applications

• Bus-oriented data storage systems
• Microprocessor interface circuits
• High-speed digital signal processing registers
• Parallel-to-serial data conversion modules

Procurement Notes

Verify the specific suffix 'SJX' against official Fairchild or onsemi documentation to confirm exact pinout and electrical characteristics, as variations exist within the AC series. Ensure the source document explicitly lists this part number rather than generic equivalents. Confirm RoHS compliance status if required by your manufacturing standards. Cross-reference with current manufacturer lifecycle notices to ensure availability.

Selection Notes

Select this component when an octal register with three-state outputs is required for bus systems. It is suitable for applications needing TTL-compatible inputs and operation between 2V and 6V. Consider the 20-pin SOIC package for surface mount assembly. Compare propagation delay specifications against system timing requirements to ensure the 13 ns delay meets design constraints.

Part Context

This component belongs to the 74AC logic family, known for high speed and low power consumption compared to standard 74LS series. It is functionally similar to the 74ACT574 but operates over a wider voltage range. The '574' designation indicates a broadside pinout configuration, distinct from the '374' side-by-side layout. It serves as a fundamental building block for sequential logic in digital electronics.

Replacement Considerations

Public confirmed substitute part numbers include SN74AC574DR from Texas Instruments and MC74AC574DWR2G from onsemi. Verify pin compatibility and electrical parameters before substitution.