IC 4028 – BCD to Decimal Decoder

Overview

The IC 4028 is a CMOS-based BCD (Binary Coded Decimal) to Decimal decoder IC that takes a 4-bit binary input and decodes it into one of ten unique outputs. It is widely used in digital electronics, particularly in applications requiring the conversion of binary numbers into decimal form for display or further processing. The IC is recognized for its low power consumption, high noise immunity, and wide operating voltage range, making it a popular choice for digital systems.

Features

• 4-to-10 Line Decoder: The IC 4028 decodes a 4-bit binary input (BCD) into one of ten active low outputs, corresponding to decimal digits 0 through 9.
• High Noise Immunity: The CMOS technology ensures robust performance even in electrically noisy environments.
• Wide Operating Voltage: Operates across a voltage range of 3V to 15V, providing flexibility for integration into various systems.
• Low Power Consumption: Efficient power usage, ideal for battery-operated devices and other low-power applications.
• Standardized Pinout: Compatible with other logic ICs and easy to integrate into existing designs.

Pin Configuration

The IC 4028 is typically available in a 16-pin Dual In-line Package (DIP). The pinout configuration is as follows:

• Pin 1: Input A (Least Significant Bit)
• Pin 2: Input B
• Pin 3: Input C
• Pin 4: Input D (Most Significant Bit)
• Pin 5: No Connection
• Pin 6-9: Outputs (Q4 to Q7)
• Pin 10-12: Outputs (Q8 to Q10)
• Pin 13: Ground (GND)
• Pin 14-15: Outputs (Q2 to Q3)
• Pin 16: Positive Supply Voltage (Vcc)

Applications

• Seven-Segment Display Drivers: The IC 4028 can be used to drive seven-segment displays by converting a 4-bit BCD input into the corresponding decimal output.
• Digital Clocks: Commonly used in digital clock circuits to decode BCD outputs from counters into decimal digits for display.
• Counters: Integrated into digital counters where binary counting needs to be converted into decimal form.
• LED Display Systems: Employed in LED display systems where individual LEDs correspond to decimal digits.
• Numerical Data Displays: Used in applications requiring the display of numerical data in decimal form.
• Digital Input/Output Control: Suitable for controlling digital outputs based on binary input states in various logic-based control systems.

Working Principle

The IC 4028 works by taking a 4-bit binary input and decoding it into one of ten outputs. The 4-bit binary number represents the decimal digits 0 to 9, which are then output as a logic low signal on one of the ten output lines. The remaining outputs stay in a logic high state. The truth table for the IC 4028 is as follows:

Each output corresponds to one of the possible decimal digits, and only one output will be active (logic low) at a time based on the input combination.

Example Circuit

• Seven-Segment Display Driver: By connecting the outputs of the IC 4028 to the inputs of a seven-segment display, you can easily create a digital display system that shows decimal numbers. The binary inputs are provided by a binary counter, and the IC 4028 decodes these into the appropriate segments to display the corresponding decimal digit.
• Digital Counter Display: The IC 4028 can be used in conjunction with a binary counter to create a digital counting system where the binary count is converted to a decimal readout on a set of LEDs or a digital display.

Advantages

• Flexibility in Design: The wide voltage range and high noise immunity make it suitable for a variety of applications in different environments.
• Ease of Integration: Standard pinout and compatibility with other logic ICs allow easy incorporation into existing designs.
• Low Power Operation: Ideal for battery-powered devices due to its efficient power consumption.
• Reliable Performance: Robust design with high noise immunity ensures consistent operation in digital systems.

Conclusion

The IC 4028 is a versatile and reliable component for decoding binary inputs into decimal outputs. Whether you’re working on digital clocks, LED displays, or numerical data presentation, this IC provides an efficient and straightforward solution for converting BCD to decimal form. Its wide range of applications, combined with its ease of use and reliable performance, make the IC 4028 a valuable addition to any digital electronics toolkit.

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