CD74FCT163244CMT

Overview

The CD74FCT163244CMT is a CMOS bus driver from the FCT series, manufactured by Harris Corporation. It features four independent functions, each handling four bits of data with true output polarity. The device utilizes a 48-pin PDSO package and operates within a supply voltage range of 4.5 V to 5.5 V, with a nominal rating of 5 V. It supports an operating temperature range from -40 °C to 85 °C. Key electrical characteristics include a propagation delay of 4.1 ns and a load capacitance of 50 pF. The outputs are three-state, allowing for effective bus management in digital systems.

Feature Summary

• Four independent 4-bit bus drivers providing true output polarity
• Three-state outputs enable efficient bus line sharing
• CMOS construction ensures low power consumption

Applications

• High-speed data bus buffering
• Clock distribution networks
• Memory address/data bus drivers

Procurement Notes

Verify the manufacturer origin, as Harris Corporation's logic assets were acquired by Fairchild Semiconductor and subsequently ON Semiconductor. Ensure the specific suffix 'CMT' corresponds to the correct tape-and-reel packaging and pin configuration. Confirm RoHS compliance status if required for modern assembly processes, as original Harris parts may not meet current environmental standards.

Selection Notes

Select this component when a high-speed, non-inverting buffer is required for 4-bit wide buses. The FCT technology offers speed comparable to LSTTL but with CMOS power levels. Consider the 48-pin small outline package constraints for PCB layout. Verify that the system voltage aligns with the 5V nominal requirement and that the three-state control signals match the design's active-low or active-high logic requirements.

Part Context

This part belongs to the Harris FCT (Fast CMOS) family, designed to bridge the performance gap between TTL and standard CMOS logic. The FCT series was widely adopted in the 1990s for its compatibility with LSTTL interfaces while offering improved noise immunity and lower power. Harris was a key player in this market before industry consolidations changed the landscape of discrete logic manufacturing.

Replacement Considerations

Direct replacements may include the SN74FCT163244 from Texas Instruments or the MC74FCT163244 from ON Semiconductor. These equivalents share the same logical function and pinout. Verify that the replacement package matches the PDSO48 form factor and that the electrical specifications, particularly propagation delay and drive strength, meet the original design requirements.