CY74FCT543ATQCT

Overview

The CY74FCT543ATQCT is an octal bus transceiver from the FCT logic series, manufactured by Texas Instruments. It features tri-state outputs and operates within a supply voltage range of 4.75 V to 5.25 V. The device supports TTL input and output levels with a propagation delay of 6.5 ns. It provides a low-level output current of 64 mA and a high-level output current of -32 mA. Housed in a QSOP-24 package, it functions as a non-inverting registered transceiver suitable for surface-mount installation across an operating temperature range of -40°C to +85°C.

Feature Summary

• Octal bus transceiver architecture with registered data storage capabilities
• Tri-state outputs enabling effective bus line driving and isolation
• TTL-compatible input and output voltage levels for system integration

Applications

• High-speed data transfer on parallel buses
• Memory buffer applications requiring latched data retention
• Clocked data routing in digital communication systems

Procurement Notes

Verify the specific suffix 'A' against official datasheets to confirm package type and electrical characteristics, as variations exist within the FCT family. Confirm moisture sensitivity level (MSL) requirements for reflow soldering processes. Ensure the QSOP-24 footprint matches the target PCB design. Check for RoHS compliance status relevant to the manufacturing date code.

Selection Notes

Select this component when bidirectional data transfer with internal latching is required. Compare propagation delay specifications against other FCT variants if timing constraints are critical. Verify that the 64 mA drive capability meets the load requirements of the destination circuitry. Consider the thermal performance of the QSOP-24 package for the intended application environment.

Part Context

This part belongs to the Texas Instruments CY74FCT543T series of registered transceivers. It is distinct from unbuffered variants like the 74FCT541 or simple transceivers like the 74FCT245. The 'A' designation typically indicates a specific package variant within the broader FCT product line, differentiating it from standard SSOP or SOIC versions.