74AC821SC

Overview

The Fairchild Semiconductor 74AC821SC is a high-speed, low-power octal D-type flip-flop featuring separate D-type inputs for each flip-flop and 3-STATE outputs. Designed for bus-oriented applications, it includes a buffered Clock (CP) and Output Enable (OE) common to all flip-flops. The device utilizes advanced CMOS technology to achieve high speed while maintaining low power dissipation. It operates within a supply voltage range of 2.0V to 5.5V and supports an operating temperature range from -40°C to +85°C.

Feature Summary

• Octal D-type flip-flop architecture with 3-STATE outputs for bus-oriented system applications
• 5V tolerant inputs and outputs enabling interfacing between 2.5V/3.3V and 5V signal environments
• Patented noise and EMI reduction circuitry implemented in the CMOS fabrication process

Applications

• Bus-oriented data storage systems requiring high-speed operation
• Low voltage digital logic circuits interfacing with 5V tolerant environments
• Systems supporting live insertion or withdrawal operations

Procurement Notes

Verify the specific suffix against the manufacturer's current ordering guide to confirm package type and tape/reel specifications. Ensure the component meets RoHS compliance requirements if mandated by your project standards. Cross-reference the datasheet revision date to confirm technical parameters match your design constraints before finalizing procurement.

Selection Notes

Select this component when designing systems that require octal storage with tri-state bus capabilities. It is suitable for applications needing 5V tolerance on both inputs and outputs while operating at lower core voltages. Consider the propagation delay characteristics relative to your clock frequency requirements and ensure the output drive strength meets the load capacitance demands of your specific circuit topology.

Part Context

This part belongs to the 74LCX series of low-voltage CMOS logic devices. The series is characterized by high speed and low power consumption, fabricated using advanced CMOS technology. It serves as a key component in digital logic families designed for portable and battery-operated applications where power efficiency and voltage translation are critical design factors.

Replacement Considerations

Equivalent parts include the 74LCX821MTC and 74LCX821MSA from ON Semiconductor. These variants share identical functional descriptions and electrical characteristics. Verify pinout compatibility and package dimensions before substitution to ensure mechanical fit within the existing assembly.