MC74AC564N

Overview

The MC74AC564N is an octal D-type flip-flop with three-state outputs from the AC logic series, manufactured by onsemi. It features a buffered common Clock (CP) and a buffered common Output Enable (OE). Data at the D inputs is latched on the LOW-to-HIGH Clock transition. The device provides inverted outputs and is functionally identical to the MC74AC574 but with inverted polarity. It operates within a temperature range of -40 °C to 85 °C and supports a load capacitance of 50 pF.

Feature Summary

• Octal D-type latch architecture with inverted outputs for specific signal inversion requirements
• Three-state outputs enabling bus-oriented applications and direct microprocessor interfacing
• Buffered common Clock and Output Enable lines to reduce input loading and simplify control

Applications

• Bus-oriented data storage systems requiring tri-state isolation
• Microprocessor input or output port interfaces utilizing opposite-side pinout
• General-purpose octal register applications in digital logic circuits

Procurement Notes

Verify component authenticity through authorized onsemi distribution channels. Confirm package integrity for the PDIP-20 configuration. Ensure compliance with project-specific material regulations, noting that this specific part number may not meet current RoHS standards compared to newer suffix variants. Validate operating temperature ranges against system environmental constraints before integration.

Selection Notes

Select the MC74AC564N when inverted octal data storage is required alongside three-state bus capability. Choose this variant over non-inverted counterparts like the MC74AC574 if signal inversion is needed without additional gates. Consider the PDIP-20 package for through-hole prototyping or legacy board designs where surface-mount options are unsuitable.

Part Context

This component belongs to the 74AC family of high-speed CMOS logic devices. It shares functional similarities with the MC74AC574, differing primarily in output polarity. The device utilizes a standard DIP-20 plastic dual in-line package, suitable for industrial temperature ranges. It represents a standard solution for parallel data latching in mixed-signal environments.

Replacement Considerations

The MC74AC574N serves as the non-inverted functional equivalent. For lead-free compliance, verify availability of RoHS-compliant suffixes such as N or G, though these may alter ordering codes. Cross-reference with other 74AC series octal latches ensuring matching voltage and speed specifications.