CY74FCT543CTQC

Overview

The CY74FCT543CTQC is an octal registered bus transceiver from the FCT logic series, manufactured by Texas Instruments. It features eight bidirectional data paths with latched outputs in a 24-pin SSOP package. The device operates on a single 4.75V to 5.25V supply and supports TTL input and output levels. Key electrical parameters include a propagation delay of 8.5 ns, low-level output current of 64 mA, and high-level output current of -32 mA. It functions as a non-inverting transceiver with independent control for each direction.

Feature Summary

• Provides registered bidirectional data transfer with latch capability for stable signal holding.
• Features three-state outputs allowing direct connection to system buses without external drivers.
• Supports independent control of data flow direction for flexible bus management.

Applications

• High-speed data acquisition systems requiring buffered memory interfaces
• Microprocessor-based systems utilizing parallel data buses
• Communication equipment needing isolated bidirectional signal routing

Procurement Notes

Verify the manufacturer designation carefully, as this component is often listed under Texas Instruments despite the Cypress part number prefix. Confirm the specific suffix indicates the 24-SSOP package variant. Check RoHS compliance status against current regulatory requirements for your region. Ensure the operating temperature range meets your environmental specifications before finalizing procurement.

Selection Notes

Select this component when a registered bidirectional interface is required rather than a simple buffer. Compare it against the unregistered CY74FCT541 if latching functionality is not needed. Consider the 24-pin SSOP footprint constraints during PCB layout. Verify that the 8.5 ns propagation delay aligns with your system timing requirements for reliable data integrity.

Part Context

This part belongs to the 74FCT family of high-speed CMOS logic devices. It serves as a registered version of standard bus transceivers, adding storage capability to prevent data corruption during bus transitions. The FCT series is designed for compatibility with standard TTL logic levels while offering faster switching speeds than older 74LS families.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Cross-reference with other 74FCT543 variants from different manufacturers only after verifying pinout and electrical parameter compatibility through official datasheets.