IC 74247 – BCD to 7-Segment Decoder/Driver

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The IC 74247 is a BCD to 7-segment latch/decoder/driver, part of the 7400 series TTL logic family. It converts binary-coded decimal (BCD) input into signals that drive a 7-segment display while also providing latching capability to hold the output data. This IC is used in digital displays to show decimal numbers, making it ideal for applications like digital clocks, counters, and numeric readouts.

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IC 74247 – BCD to 7-Segment Decoder/Driver with Open-Collector Outputs

Overview

The IC 74247 is a Binary Coded Decimal (BCD) to 7-segment decoder/driver designed for driving common-anode displays. It converts a 4-bit BCD input into signals that will illuminate the appropriate segments of a 7-segment display to represent numbers 0 through 9. The IC features open-collector outputs, making it suitable for interfacing with various types of displays and allowing for external pull-up resistors to be used.

Features

  • BCD to 7-Segment Conversion: Converts 4-bit BCD input to the corresponding 7-segment code.
  • Open-Collector Outputs: Allows for interfacing with higher voltage levels or using wired-AND logic.
  • Supports Common-Anode Displays: Specifically designed to drive common-anode 7-segment displays.
  • Standard TTL Compatibility: Compatible with standard TTL logic levels.
  • Lamp Test and Blanking Inputs: Provides functionality for testing and controlling display visibility.

Pin Configuration

The IC 74247 is typically housed in a 16-pin Dual In-line Package (DIP) with the following pin configuration:

  • Pins 1, 2, 6, 7: BCD Inputs (D, C, B, A) for the binary-coded decimal input.
  • Pin 3: Lamp Test (LT) input to illuminate all segments for testing purposes.
  • Pin 4: Blanking (BI) input to disable all outputs (turn off the display).
  • Pins 9-15: Outputs (a, b, c, d, e, f, g) to drive the corresponding segments of the 7-segment display.
  • Pin 8: Ground (GND).
  • Pin 16: Positive Supply Voltage (Vcc).

Working Principle

  1. BCD Input: The IC receives a 4-bit BCD input representing numbers from 0 to 9.
    • Example: BCD input of “0101” corresponds to the number 5.
  2. 7-Segment Output: The IC decodes the BCD input and generates the appropriate signals to drive the 7-segment display.
    • Example: For the number 5, the segments a, c, d, f, and g would be illuminated.
  3. Open-Collector Outputs: The IC’s outputs are open-collector, meaning they can only sink current. External pull-up resistors are required to pull the output lines to a high state when not active.
  4. Control Inputs:
    • Lamp Test (LT): When active, all segments of the display are turned on, allowing for a quick test of the display.
    • Blanking Input (BI): When active, all outputs are disabled, effectively turning off the display.

Applications

  • Digital Clocks: Used in digital clocks to display time.
  • Counters and Timers: Converts BCD output from counters and timers to a 7-segment display format.
  • Scoreboards: Drives 7-segment displays in electronic scoreboards.
  • Calculators: Displays numeric output in basic calculators.

Example Circuit

  • Digital Clock Display: In a digital clock circuit, the IC 74247 could be used to decode the BCD output from a timekeeping chip and drive a 7-segment display to show the hours and minutes.

Advantages

  • Efficient BCD to 7-Segment Conversion: Simplifies the design of circuits requiring numeric displays.
  • Flexible Output Configuration: Open-collector outputs allow for interfacing with different logic levels.
  • Integrated Lamp Test and Blanking: Provides additional control over the display.

Conclusion

The IC 74247 is a versatile BCD to 7-segment decoder/driver, particularly useful in applications where a common-anode 7-segment display needs to be driven. Its ability to convert BCD inputs into readable numeric displays, coupled with the flexibility of open-collector outputs, makes it a critical component in a wide range of digital electronics projects. Whether you are building clocks, timers, or any system requiring numeric output, the IC 74247 provides a reliable and straightforward solution for 7-segment display driving.

IC 7440 – Dual 4-Input NAND Gate with Open-Collector Outputs

Sold By : Computronics Lab SKU: ic-74247 Category: Tags: ,

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