CY74FCT821ATQCT-CY

Overview

The CY74FCT821ATQCT is an octal bus driver manufactured by Cypress Semiconductor Corporation, belonging to the FCT logic series. It features a single functional block with eight bits of data width and true output polarity. The device utilizes CMOS technology and is housed in a 20-pin QSOP package with a standard 0.150-inch body width. It supports dual output enable control for flexible bus management. The component operates within a supply voltage range of 4.75 V to 5.25 V and functions across a temperature range of -40 °C to +85 °C.

Feature Summary

• Octal bus driver architecture providing eight-bit data transmission capability
• Dual output enable functionality for precise bus control and isolation
• True output polarity ensuring non-inverting signal transfer
• CMOS construction compatible with standard 5V logic systems

Applications

• High-speed parallel data bus buffering in computer architectures
• Memory interface drivers for system board interconnects
• I/O expansion modules requiring tri-state bus isolation
• Digital signal routing in embedded processing systems

Procurement Notes

Verify manufacturer origin as Cypress Semiconductor Corporation or Texas Instruments following corporate acquisitions. Confirm package designation matches the 20-pin QSOP specification. Ensure operational parameters align with the required 5V logic environment and industrial temperature range specifications before integration into design projects.

Selection Notes

Select this component when an octal buffer with independent dual enable controls is required for 5V CMOS applications. The device suits designs needing high-speed data latching or driving capabilities on parallel buses. Consider the specific pinout compatibility and thermal performance requirements relative to the target PCB layout constraints.

Part Context

This part belongs to the FCT (Fast CMOS Technology) family, designed for high-speed operation with low power consumption. The CY74FCT821 variant specifically addresses the need for wide-bus buffering with enhanced control features compared to standard unidirectional drivers. It serves as a critical interface element between microprocessors and peripheral memory or I/O devices.

Replacement Considerations

Compatible substitutes include the CY74FCT821T and CY74FCT821AT variants from the same manufacturer line. Cross-reference with Texas Instruments equivalents such as the SN74FCT821ATQ if Cypress sourcing is unavailable. Verify that replacement parts maintain identical pin configurations and electrical characteristics.