CY74FCT646ATQCT

Overview

The CY74FCT646ATQCT is an octal bus transceiver manufactured by Texas Instruments, belonging to the FCT logic series. It features a single non-inverting element with eight bits per element and provides three-state outputs. The device operates within a supply voltage range of 4.75V to 5.25V and supports TTL input and output levels. It is housed in a 20-pin SSOP package designed for surface mount installation. The component functions as a registered bus transceiver, ensuring data integrity during transmission across digital systems.

Feature Summary

• Octal bus transceiver architecture providing eight-bit data path capability
• Registered functionality with three-state outputs for controlled signal driving
• Non-inverting polarity maintaining original signal directionality
• TTL-compatible input and output levels for standard logic interfacing

Applications

• High-speed data bus interfaces in embedded systems
• Memory buffer applications requiring registered storage
• Clock distribution networks utilizing three-state control
• Bidirectional data transfer between microprocessors and peripherals

Procurement Notes

Verify the specific suffix 'A' against design requirements, as it denotes a distinct revision or variant compared to the base CY74FCT646T model. Confirm package compatibility with existing PCB footprints, noting the 20-pin SSOP configuration. Check current manufacturing status and availability through authorized distributors, as older revisions may be discontinued. Ensure RoHS compliance matches environmental regulations for the target assembly process.

Selection Notes

Select this component when an octal registered transceiver with three-state outputs is required for bidirectional data flow. The FCT series offers CMOS performance with TTL compatibility, suitable for mixed-logic environments. Consider the 20-pin SSOP package for space-constrained surface-mount designs. Verify that the operating temperature range and supply voltage specifications align with the system's power and thermal constraints.

Part Context

This part belongs to the Texas Instruments CY74FCT family, which combines CMOS density with TTL speed. The 646 designation specifically identifies an octal bus transceiver with registered outputs. It serves as a critical interface component in digital circuits, facilitating data latching and directional control on parallel buses. The FCT technology ensures low power consumption while maintaining fast switching speeds.

Replacement Considerations

The CY74FCT646TQCT is listed as a similar substitute part number from Texas Instruments. Verify functional equivalence regarding pinout and electrical characteristics before replacement. Note that the base model without the 'A' suffix may have different manufacturing revisions or packaging details.