54HC390/BEA

Overview

The CD54HC390/BEA is a high-speed CMOS binary counter manufactured by Rochester Electronics. It belongs to the HC/UH series and features asynchronous operation with negative edge triggering. The device contains two independent 4-bit counters, each capable of counting in the up direction. It utilizes a ceramic dual in-line package (CDIP) with 14 terminals. The component supports load and preset inputs for flexible control. It operates within an extended temperature range from -55 °C to 125 °C and is constructed using glass-sealed ceramic materials.

Feature Summary

• Asynchronous 4-bit binary counting capability with negative edge triggering
• Dual independent counter sections within a single package
• High-speed CMOS technology ensuring low power consumption
• Robust ceramic construction suitable for harsh environments

Applications

• Military aerospace systems requiring radiation hardness
• Spacecraft telemetry and command logic
• High-reliability industrial control units
• Defense communication equipment

Procurement Notes

Verify that the specific part number matches the required ceramic package and leaded configuration. Confirm compliance with relevant military specifications such as MIL-PRF-38534 or similar high-reliability standards. Ensure the supplier provides traceability documentation for the ceramic construction and sealing process. Check for any specific screening levels required by the end application.

Selection Notes

Select this component when high reliability and radiation tolerance are critical. The ceramic package offers superior environmental protection compared to plastic alternatives. Verify that the asynchronous nature of the counter aligns with the system timing requirements. Ensure the voltage supply range matches the design constraints for HC series logic.

Part Context

This component is part of the 54HC series, which is designed for high-performance applications. The '54' prefix typically indicates military-grade quality and extended temperature ranges. Rochester Electronics specializes in sourcing and distributing obsolete and hard-to-find components, often providing qualified replacements for legacy systems.

Replacement Considerations

Direct substitutes include other 54HC390 variants from manufacturers like Texas Instruments or National Semiconductor, provided they meet the same ceramic package and performance specifications. Cross-reference pinouts and electrical characteristics to ensure compatibility.