CD54HCT374F

Overview

The CD54HCT374F is a high-speed CMOS logic octal D-type flip-flop manufactured by Harris Corporation. It features 3-state outputs and operates within a voltage range of 4.5 V to 5.5 V. The device utilizes a ceramic DIP-20 package with a glass-sealed construction, suitable for military and aerospace environments. Key electrical parameters include a propagation delay of 10 ns to 50 ns, an operating temperature range from -55 °C to +125 °C, and a maximum output current of 6 mA. It is designed for radiation hardness with a total ionizing dose tolerance of 50 krad(Si) and single-event latch-up immunity.

Feature Summary

• Octal D-type flip-flop architecture with three-state outputs for bus-oriented applications
• Ceramic hermetic packaging providing environmental sealing and mechanical robustness
• Radiation-hardened design ensuring reliability in space and harsh electromagnetic conditions
• TTL-compatible input thresholds facilitating direct interfacing with standard logic systems

Applications

• Aerospace and satellite data storage registers
• Military communication system timing circuits
• Harsh environment industrial control logic
• High-reliability computer memory buffer stages

Procurement Notes

Verify the manufacturer origin carefully, as Harris Corporation's semiconductor assets were acquired by Texas Instruments. Ensure the specific part number matches the required radiation qualification standards (e.g., ESCC or SMD) for your application. Confirm that the ceramic DIP-20 package type aligns with your PCB footprint requirements. Check for RoHS compliance status, as older military-grade parts may not meet modern environmental directives. Validate supply chain authenticity through authorized distributors to avoid counterfeit components.

Selection Notes

Select this component when high radiation tolerance and wide temperature operation are critical. The HCT series ensures compatibility with TTL logic levels, simplifying interface design with existing digital systems. The ceramic package offers superior thermal stability compared to plastic alternatives. Consider the pin count and form factor constraints during board layout. Evaluate the need for 3-state outputs if bus sharing is required in the circuit design.

Part Context

The CD54HCT374F belongs to the CD54HCTxxx series, which represents a line of radiation-hardened high-speed CMOS logic functions. This series is specifically engineered for the aerospace industry, meeting stringent requirements for total dose hardness and single-event latch-up immunity. These devices are housed in hermetic ceramic packages to withstand extreme environmental stresses, making them distinct from commercial-grade 74HCT counterparts.

FAQ

What is the radiation hardness specification for the CD54HCT374F?

The device is qualified for a total ionizing dose of 50 krad(Si) and exhibits immunity to single-event latch-up up to 125 MeV.cm²/mg.

Does the CD54HCT374F have a reset function?

No, the CD54HCT374F is an octal D-type flip-flop without a master reset feature. Models such as the CD54HCT377 include a data enable pin, but do not specify a global reset.