CY74FCT245TSOC

Overview

The CY74FCT245TSOC is an octal bus transceiver from the FCT logic series, manufactured by Texas Instruments. It features eight non-inverting channels with three-state outputs in a 20-pin SOIC package. The device operates within a supply voltage range of 4.75 V to 5.25 V and supports TTL input and output levels. Key electrical parameters include a propagation delay of 7 ns, a low-level output current of 64 mA, and a high-level output current of -32 mA. It functions across an industrial temperature range of -40°C to +85°C.

Feature Summary

• Provides bidirectional data transfer via eight independent channels controlled by a single direction pin.
• Features three-state outputs that isolate the bus when disabled, preventing signal contention.
• Accepts TTL-compatible input signals while driving CMOS loads effectively.

Applications

• High-speed data routing between microprocessors and memory modules.
• Buffering and bus driving in computer systems and instrumentation.
• Control signal distribution in industrial automation environments.

Procurement Notes

Verify the manufacturer designation carefully, as the part number is primarily associated with Texas Instruments rather than Cypress Semiconductor Corp. Confirm the specific suffix 'TSOC' corresponds to the standard SOIC-20 plastic package. Ensure compatibility with existing PCB footprints and verify RoHS compliance status for the specific production batch before integration into designs requiring environmental certification.

Selection Notes

Select this component when an octal, non-inverting bus transceiver with three-state capability is required for 5V logic systems. It is suitable for applications demanding moderate speed with a 7 ns propagation delay. Consider alternative packages such as SSOP or TSSOP if space constraints differ from the standard SOIC dimensions. Ensure the design accounts for the specified 64 mA sink and 32 mA source drive capabilities to maintain signal integrity.

Part Context

This component belongs to the 74FCT (Fast CMOS) family, bridging the performance gap between standard TTL and CMOS technologies. It offers faster switching speeds than legacy 74LS devices while maintaining CMOS power efficiency. The CY74FCT245 variant specifically provides unidirectional control over eight bits of data flow, making it a standard choice for parallel data buses in mid-1990s to early 2000s electronic architectures.

Replacement Considerations

Publicly confirmed substitute part numbers include CY74FCT245TSOG4 and CY74FCT245CTSOC. These variants share identical logical functionality and pinouts but may differ in packaging material or environmental compliance markings. Verify that any replacement maintains the same 20-pin SOIC footprint and electrical specifications to ensure direct interchangeability without circuit modification.