HCF4555BEY

Overview

The HCF4555BEY is a dual 1-of-4 decoder/demultiplexer fabricated in Metal Oxide Semiconductor technology. It features two independent decoders, each with two select inputs (A and B), an enable input (E), and four mutually exclusive outputs that are high on select. The device operates within a supply voltage range of 3 V to 20 V and supports an operating temperature range from -55 °C to +125 °C. Input leakage current is specified at ±1 μA maximum at VDD = 18 V. Quiescent current is tested up to 20 V, with typical values ranging from 0.04 μA at 5 V to 0.08 μA at 20 V.

Feature Summary

• Dual 1-of-4 decoder/demultiplexer architecture with mutually exclusive outputs
• High noise margin ensuring reliable logic level discrimination across voltage ranges
• Low quiescent power dissipation under all digital control conditions
• Standardized symmetrical output characteristics for consistent performance

Applications

• 1-of-4 line data demultiplexing
• Expanding to 1-of-8 or 1-of-16 decoding configurations
• Digital signal routing in CMOS logic systems

Procurement Notes

Verify the package type matches the required form factor, as the HCF4555B series is available in both DIP and SOP packages. Confirm that the specific ordering suffix corresponds to the desired packaging format. Ensure environmental specifications meet the operational requirements, particularly regarding the wide temperature range and radiation hardness if applicable to the target system.

Selection Notes

Select this component when a dual channel decoding solution is required within a single integrated circuit. The device is suitable for applications demanding low power consumption and high noise immunity. Consider the available parametric ratings at 5 V, 10 V, and 15 V to ensure compatibility with the system's supply voltage levels. Verify that the input leakage and propagation delay characteristics align with the timing constraints of the design.

Part Context

The HCF4555B belongs to the legacy CMOS4000B series, which includes various high-voltage CMOS logic gates and functions. These components are designed for robust operation in harsh environments and offer a wide set of noise-tolerant logic functions. The series is ESCC qualified, facilitating use in spacecraft and other critical applications requiring high reliability and standardized specifications.

Replacement Considerations

Check for equivalent dual 1-of-4 decoders in the CMOS4000B family. Verify pinout compatibility and electrical parameters such as supply voltage range and propagation delay before substitution.