CY74FCT646TQCTG4

Overview

The CY74FCT646TQCTG4 is an octal bus transceiver with three-state outputs manufactured by Texas Instruments. It operates within a supply voltage range of 4.75V to 5.25V and features TTL-compatible input and output levels. The device provides a low-level output current of 64mA and a high-level output current of -32mA. It exhibits a propagation delay of 9ns and functions within an operating temperature range of -40°C to +85°C. The component is housed in a 24-pin SOIC package.

Feature Summary

• Octal bus transceiver architecture supporting bidirectional data transfer
• Three-state outputs for effective bus line management
• TTL-compatible input and output logic levels

Applications

• High-speed data transmission systems
• Memory module interfacing
• Bus-oriented architectures requiring registered buffering

Procurement Notes

Verify the specific suffix 'G4' against the manufacturer's current documentation to confirm RoHS compliance status and lead times, as this suffix indicates environmental attributes. Confirm availability through authorized distributors, noting that older revisions may be discontinued or subject to long-lead manufacturing cycles. Ensure the 24-SOIC footprint matches the target PCB design constraints before finalizing procurement orders.

Selection Notes

Select this component when designing systems requiring eight-bit wide data paths with registered storage capabilities. The FCT series offers faster switching speeds compared to standard CMOS equivalents while maintaining compatibility with TTL logic families. Consider the 9ns propagation delay and drive strength requirements relative to the load capacitance on the bus lines to ensure signal integrity at the intended operating frequencies.

Part Context

This part belongs to the Texas Instruments CY74FCT646T family of registered bus transceivers. The G4 suffix typically denotes Green/RoHS-compliant packaging materials. It serves as a bridge between microprocessors and peripheral devices, providing latched data storage to isolate input changes from output transitions during bus arbitration phases.

Replacement Considerations

Check for CY74FCT646ATQCT as a potential alternative if the base model is unavailable, ensuring pinout and electrical specifications remain identical. Verify that any substitute maintains the same 24-pin SOIC package dimensions and thermal characteristics.