IC 74LS47 Decode/Driver IC: Datasheet, Pinout and Circuit

The IC 74LS47, also known as a decode/driver IC, is a fundamental integrated circuit that plays a crucial role in converting binary-coded decimal (BCD) inputs into corresponding outputs for driving seven-segment displays. The IC 74LS47 takes BCD inputs and generates the necessary control signals to activate specific segments on a seven-segment display, allowing for clear and intuitive visual representation of numbers.

In this article, we will delve into the datasheet, pinout, and circuitry of the IC 74LS47 decode/driver IC, offering valuable insights for both beginners and experienced electronics enthusiasts seeking to incorporate this component into their digital display projects.

What is IC 74LS47

The IC 74LS47 is a specific type of integrated circuit (IC) that belongs to the 74LS family of TTL (Transistor-Transistor Logic) devices. The 74LS47 is a BCD-to-7-segment decoder/driver IC, which means it's used to convert Binary-Coded Decimal (BCD) input data into a format that can drive a 7-segment display.

BCD-to-7-segment decoder

A BCD-to-7-segment decoder is a digital circuit or integrated circuit (IC) that converts Binary-Coded Decimal (BCD) input into the appropriate control signals for driving a 7-segment display. BCD is a binary representation of decimal numbers where each decimal digit is represented by a 4-bit binary code.

The purpose of a BCD-to-7-segment decoder is to take the BCD input and produce the necessary signals to light up the appropriate segments of a 7-segment display to display the corresponding decimal digit.

IC 74LS47 Specification and Features

Here are the specification of IC 74LS47:

Features of 74LS47

• BCD-to-7-Segment Decoding: Converts Binary-Coded Decimal (BCD) input into the necessary control signals to drive a 7-segment display.
• Decimal Point Control: Includes a separate output for controlling the decimal point segment of the display.
• Technology Family - LS: Belongs to the Low-power Schottky (LS) technology family, offering a balance between power efficiency and performance.
• Supply Voltage Range (VCC): Operates reliably within a supply voltage range of 4.75V (minimum) to 5.25V (maximum).
• Nominal Voltage (Voltage (Nom)): Designed to operate at a nominal voltage of 5V.
• Maximum Frequency: Can handle input signals and produce output signals at a maximum frequency of up to 35 MHz.
• Propagation Delay (tpd): Provides a maximum propagation delay of 100 ns (nanoseconds) at the normal operating voltage.
• Configuration - 4:7: Specifically designed to decode a 4-bit input into a 7-bit output configuration, suitable for driving a 7-segment display.
• Open-Collector Outputs: Outputs are designed as open-collector, allowing flexible interfacing with various display types (common-anode or common-cathode).
• Output Current (IOL, IOH): Can sink up to 3.2 mA (milliamperes) of current and source up to -0.05 mA (negative value indicates current sink) from its outputs.
• Operating Temperature Range: Designed to operate within a temperature range of 0°C to 70°C, making it suitable for a variety of environments.
• Digital Input Leakage: Allows a maximum digital input leakage current of 5 uA (microamperes).
• Electrostatic Discharge (ESD) Protection: Provides protection against electrostatic discharge with ratings of 0.75 kV (ESD CDM) and 2 kV (ESD HBM).
• Cascadable: Multiple ICs can be cascaded together to drive multiple 7-segment displays, enabling more complex numerical and character representations.
• Reliable and Catalog Rated: Designed for reliable operation and is available as a catalog-rated component, indicating its widespread availability.

IC 74LS47 Pinout and Configuration

IC 74LS47 Pinout

IC 74LS47 Configuration

IC 74LS47 Circuit Diagram

The 74LS47 Decoder:

When connecting the 74LS47 decoder/driver to a common anode 7-segment display, it's necessary to incorporate a total of seven resistors (eight if the decimal point is included) into the circuit.

IC 74LS47 Application

IC 74LS47 is commonly used in the following applications when using digital electronic display devices:

• 💎Digital Clock: Used to display hours and minutes in a digital clock.
• 💎Calculator: To display input numbers, operators and results in a simple calculator.
• 💎Counters and Timers: Used to display counting or elapsed time.
• 💎Temperature Display: Displays temperature readings in a temperature measurement system.
• 💎Scoreboard: Used in sports to display scores or numbers.
• 💎Educational Kits: Often used in educational kits to teach the basics of digital electronics and display technology.
• 💎Simple Alphanumeric Displays: Multiple ICs and 7-segment displays allow basic letters and symbols to be displayed.
• 💎Industrial Control Panel: Displays important numeric values or codes on an industrial control panel.
• 💎Process Control: In process control systems, to display various parameters such as pressure, flow or temperature.
• 💎Prototyping and Learning: Used in digital electronics projects to teach the basics of BCD coding, decoding and driving 7-segment displays.

IC 74LS47 Alternative

74LS48

The 74LS48 is a BCD-to-7-segment decoder/driver integrated circuit (IC) from the 74LS series of logic devices. It is designed to convert Binary-Coded Decimal (BCD) input data into the necessary control signals to drive a 7-segment display. The IC also includes additional features for testing and blanking control of the display.

74LS47 vs 74LS48

Both the IC 74LS47 and the IC 74LS48 are related to BCD (Binary-Coded Decimal) decoding and driving 7-segment displays, but they serve slightly different functions.

Here are the differences between 74LS47 and 74LS48:

IC 74LS47 Price

The price of the IC 74LS47 can vary depending on factors such as the supplier, quantity ordered, location, and current market conditions.

Check the IC 74LS47 price from Avaq.

IC 74LS47 Datasheet

Check and download 74LS47 datasheet here>>

IC 74LS47 Manufacturer

The IC 74LS47 is part of the 74LS series of integrated circuits (ICs), which was originally manufactured by Texas Instruments (TI). Texas Instruments is a well-known semiconductor company that produces a wide range of electronic components, including various types of logic ICs like the 74LS family.

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Conclusion

In conclusion, the IC 74LS47 decode/driver IC holds a pivotal role in the world of digital displays, providing a seamless and efficient way to convert binary-coded decimal inputs into visual representations on seven-segment displays. Its straightforward circuit design and simplified interface make it a preferred choice among electronics designers and hobbyists seeking to create numeric and alphanumeric displays. When working with the IC 74LS47, refer to the datasheet and application notes to ensure proper connection and optimal operation.