HCC/HCF4585B 4-Bit Magnitude Comparator

Overview

The HCC4585B (extended temperature range) and HCF4585B (intermediate temperature range) are monolithic integrated circuits belonging to the "B" series of CMOS devices. These 4-bit magnitude comparators are designed for high-performance digital comparison operations. They are available in 16-lead dual in-line plastic or ceramic packages, as well as plastic micro packages, making them suitable for a wide range of industrial and commercial applications.

These devices provide a low-power, high-speed solution for comparing two 4-bit binary numbers, with outputs indicating whether one number is greater than, less than, or equal to the other. The HCC/HCF4585B is an essential component for arithmetic logic units (ALUs), control systems, and data processing applications.

Features

• 4-Bit Magnitude Comparison: Capable of comparing two 4-bit binary numbers (A3-A0 and B3-B0).
• Cascadable Design: Multiple devices can be cascaded for comparing longer binary words using the expansion inputs (A>B, A
• Three Output States: Provides three outputs indicating A>B, A
• Wide Operating Voltage Range: Operates from 3V to 18V, making it versatile for various logic levels.
• Low Power Consumption: CMOS technology ensures minimal power dissipation.
• High Noise Immunity: Typical of CMOS devices, ensuring reliable operation in noisy environments.
• Extended and Intermediate Temperature Ranges: HCC4585B supports -55°C to +125°C, while HCF4585B supports -40°C to +85°C.
• Multiple Package Options: Available in 16-lead DIP (plastic or ceramic) and plastic micro packages.

Applications

The HCC/HCF4585B is widely used in digital systems where binary number comparison is required. Key applications include:

• Arithmetic Logic Units (ALUs): Used in processors for conditional branching and decision-making.
• Control Systems: Implements logic for feedback control loops and threshold detection.
• Data Processing: Employed in sorting algorithms and priority encoders.
• Test and Measurement Equipment: Used for comparing input signals against reference values.
• Industrial Automation: Facilitates decision-making in PLCs and motor control systems.

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (VDD): -0.5V to +20V
• Input Voltage (Vin): -0.5V to VDD + 0.5V
• Operating Temperature Range (HCC4585B): -55°C to +125°C
• Operating Temperature Range (HCF4585B): -40°C to +85°C
• Storage Temperature Range: -65°C to +150°C

DC Electrical Characteristics

(Typical values at VDD = 10V, TA = 25°C unless otherwise specified)

• High-Level Output Voltage (VOH): ≥9.95V (IOH = -0.4mA)
• Low-Level Output Voltage (VOL): ≤0.05V (IOL = 0.4mA)
• Input Leakage Current (Iin): ≤1µA (Vin = 0V to VDD)
• Quiescent Supply Current (IDD): ≤1µA (Vin = 0V or VDD)

AC Electrical Characteristics

(Typical values at VDD = 10V, TA = 25°C unless otherwise specified)

• Propagation Delay (A/B to Output): 200ns max (CL = 50pF)
• Input Capacitance: 5pF typical
• Power Dissipation Capacitance: 30pF typical

Package Information

16-Lead Dual In-Line Package (DIP)

• Material: Plastic (HCC/HCF4585BP) or Ceramic (HCC4585BF)
• Pin Pitch: 2.54mm (0.1 inches)
• Package Dimensions: 19.3mm x 6.35mm x 4.57mm

16-Lead Plastic Micro Package

• Material: Plastic (HCC/HCF4585BM)
• Pin Pitch: 1.27mm (0.05 inches)
• Package Dimensions: 10.2mm x 5.3mm x 1.75mm

Functional Description

The HCC/HCF4585B compares two 4-bit binary numbers (A3-A0 and B3-B0) and provides three active-high outputs indicating the result of the comparison: A>B, AB, IA

The comparator operates by examining the most significant bits (MSBs) first. If the MSBs are equal, the next lower significant bits are compared, and so on until a decision can be made. This hierarchical comparison ensures accurate results even when cascading multiple devices.

Conclusion

The HCC/HCF4585B 4-bit magnitude comparator is a versatile and reliable CMOS device suitable for a wide range of digital comparison applications. Its low power consumption, high noise immunity, and cascadable design make it an excellent choice for designers working on arithmetic operations, control systems, and data processing tasks. With multiple package options and temperature ranges available, this device can be tailored to meet the needs of various industrial and commercial applications.