QS74FCT821CTZ-S191

Flip Flops Overview

The QS74FCT821CTZ-S191 is a 10-bit bus driver from the FCT series, manufactured by Quality Semiconductor. It features true output logic and operates within a CMOS technology framework. The component utilizes a PDIP-24 package configuration with dual inline pins. Electrical specifications indicate a maximum operating frequency of 83.3 MHz at nominal supply voltage. The device supports a load capacitance of 50 pF and provides a maximum output current of 64 mA. It functions as a single-function unit with two ports for data transmission.

Flip Flops Feature Summary

• Provides high-speed data transfer capabilities suitable for system interconnects
• Features true output logic to maintain signal polarity integrity
• Incorporates power-off disable functionality to isolate outputs during inactive states

Flip Flops Applications

• High-speed data bus architectures requiring 10-bit parallel transmission
• System memory interface circuits for data buffering
• Industrial control systems utilizing FCT logic families

Flip Flops Procurement Notes

Verify the specific ordering suffix S191 against manufacturer documentation to confirm package type and tape/reel specifications. Ensure compatibility with existing PCB footprints for the PDIP-24 form factor. Cross-reference RoHS compliance status if environmental regulations apply to the target assembly process. Confirm that the source distributor provides traceable original components to avoid counterfeit risks associated with legacy semiconductor parts.

Flip Flops Selection Notes

Select this component when a 10-bit wide bus driver is required for CMOS-based digital systems. The FCT series offers speed advantages over standard TTL equivalents while maintaining compatible pinouts. Consider the PDIP-24 package availability for through-hole prototyping or specific manufacturing constraints. Evaluate the 83.3 MHz performance limit against the system clock requirements to ensure adequate timing margins for reliable operation.

Flip Flops Part Context

This part belongs to the broader 74FCT family of high-speed CMOS logic devices produced by Quality Semiconductor. It serves as a direct replacement or upgrade path for older 74FCT821 variants in existing designs. The product line emphasizes improved switching speeds and lower power consumption compared to earlier generations. Understanding its position within the FCT ecosystem aids in designing scalable logic architectures.

Flip Flops Replacement Considerations

Direct substitutes include the P74FCT821CTPC and other 74FCT821 variants from Pyramid Semiconductor. Verify pinout compatibility and electrical parameter equivalence before substitution. Check for differences in package marking or lead finish that may affect soldering processes.