74AC574PC

Overview

The Fairchild Semiconductor 74AC574PC is an octal D-type flip-flop belonging to the AC logic series. It features eight positive edge-triggered D-type inputs and non-inverting outputs. The device operates within a supply voltage range of 2V to 6V, with a typical propagation delay of 13.5ns at 5V. It provides high drive capability with output currents of ±24mA. Packaged in a 20-pin PDIP format, it supports through-hole mounting and functions across an industrial temperature range of -40°C to +85°C.

Feature Summary

• Octal configuration with separate D-type inputs for each flip-flop
• Positive edge-triggered clocking mechanism for data storage
• Non-inverting output polarity providing true logic states
• High current drive capability suitable for direct load interfacing

Applications

• General-purpose parallel data storage registers
• Input/output port expansion for microprocessor systems
• Bus-oriented data latching applications
• Timing sequence control circuits

Procurement Notes

Verify component authenticity by checking manufacturer markings against official datasheet specifications. Confirm package type matches the required 20-PDIP form factor. Ensure operating voltage requirements align with system design constraints. Review end-of-life status as availability may be limited. Validate RoHS compliance status if environmental regulations apply to the target application.

Selection Notes

Select this component when an octal D-type flip-flop with standard AC speed characteristics is required. The 20-PDIP package suits prototyping or legacy board designs needing through-hole technology. Consider the 2V-6V supply range for compatibility with various logic families. Evaluate the ±24mA output current against load requirements. Compare against ACT variants if TTL-compatible inputs are necessary instead of CMOS inputs.

Part Context

This part belongs to the 74AC family of advanced CMOS logic devices, offering higher speed than standard 74HC counterparts while maintaining low power consumption. It is functionally similar to the 74ACT574 but utilizes CMOS-compatible inputs rather than TTL-compatible ones. The 74AC574PC serves as a fundamental building block for sequential logic circuits requiring parallel data retention.

Replacement Considerations

Direct substitutes include the SN74AC574P from Texas Instruments and MC74AC574DWG from onsemi, though package differences may exist. For TTL-compatible input requirements, consider the 74ACT574PC variant. Verify pinout compatibility before substitution to ensure correct interface with existing circuitry.