CD74FCT2245TM

Overview

The CD74FCT2245TM is an octal bus transceiver from the FCT logic series, manufactured by Harris Corporation. It features a single function with eight bits of data transfer capability and utilizes a PDSO-20 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 4.6 ns, a low-level output current of 12 mA, and a high-level output current of -15 mA. It functions as a non-inverting tri-state transceiver with a specified operating temperature range from -40 °C to +85 °C.

Feature Summary

• Provides bidirectional data transmission across eight channels with independent direction control.
• Features true (non-inverting) output polarity for direct signal interfacing.
• Incorporates three-state outputs with internal series resistors to manage bus loading.

Applications

• High-speed memory buffer applications in computing systems
• Clock driver circuits requiring precise timing characteristics
• Control signal routing in industrial automation equipment

Procurement Notes

Verify the manufacturer origin carefully, as Texas Instruments acquired Cypress, which previously held this part number lineage. Confirm that the specific suffix 'TM' corresponds to the Harris Corporation manufacturing source rather than later TI revisions. Ensure the component matches the required PDSO-20 package dimensions and lead finish specifications before integration into production designs.

Selection Notes

Select this component when a fast, octal bus interface is required with TTL-compatible logic levels. The 4.6 ns propagation delay makes it suitable for high-frequency data paths. Consider the PDSO-20 surface-mount package for space-constrained PCB layouts. Verify thermal requirements against the -40 °C to +85 °C commercial/industrial temperature rating.

Part Context

This component belongs to the FCT (Fast CMOS) logic family, designed to bridge the performance gap between standard TTL and early CMOS technologies. The CD74 prefix indicates it was originally produced by National Semiconductor or its successor Harris Corporation before industry consolidations. It serves as a foundational building block for parallel data buses in legacy and specialized electronic architectures.

Replacement Considerations

Public confirmed substitute part numbers include CY74FCT2245TSOCT and CD74FCT2245ATM96. These alternatives share the same logical function and pinout but may differ in package type or specific electrical tolerances. Verify compatibility with existing board footprints and signal integrity requirements before substitution.