Texas Instruments
Obrázek může být reprezentace.
Viz Specifikace pro podrobnosti o produktu.
SN74LS247N
Zobrazit detail DataSheets

SN74LS247N

Product Overview

The SN74LS247N is a BCD to 7-segment latch/decoder/driver integrated circuit. It falls under the category of digital logic ICs and is commonly used in electronic display applications. This IC is known for its high-speed operation, low power consumption, and compatibility with various types of displays. The SN74LS247N is typically available in a 16-pin dual in-line package (DIP) and is widely used in electronic devices that require numerical or alphanumeric display capabilities.

Basic Information

  • Category: Digital Logic IC
  • Use: BCD to 7-segment decoder/driver
  • Characteristics: High-speed operation, low power consumption
  • Package: 16-pin DIP
  • Essence: Converts binary-coded decimal (BCD) input into signals to drive a 7-segment display
  • Packaging/Quantity: Typically sold in reels or tubes containing multiple units

Specifications

  • Supply Voltage: 4.75V to 5.25V
  • Operating Temperature: -40°C to 85°C
  • Output Current: 20mA per segment
  • Propagation Delay: 30ns (max)
  • Power Dissipation: 500mW (max)

Detailed Pin Configuration

The SN74LS247N features the following pin configuration: 1. A0 (BCD Input) 2. A1 (BCD Input) 3. A2 (BCD Input) 4. A3 (BCD Input) 5. LT (Lamp Test) 6. BI/RBO (Blanking Input/Ripple Blanking Output) 7. C (Carry Output) 8. GND (Ground) 9. F (Segment F Output) 10. E (Segment E Output) 11. D (Segment D Output) 12. C (Segment C Output) 13. B (Segment B Output) 14. A (Segment A Output) 15. LT (Lamp Test) 16. VCC (Supply Voltage)

Functional Features

The SN74LS247N integrates a BCD to 7-segment latch/decoder/driver, allowing it to convert BCD input into signals to drive a 7-segment display. It also includes features such as lamp test and blanking input for enhanced display control.

Advantages and Disadvantages

Advantages

  • High-speed operation
  • Low power consumption
  • Compatibility with various display types
  • Integrated lamp test and blanking input features

Disadvantages

  • Limited output current per segment
  • Requires external components for full display functionality

Working Principles

The SN74LS247N operates by receiving BCD input and converting it into signals to drive a 7-segment display. It utilizes internal latches and decoding logic to generate the necessary output signals for each segment of the display.

Detailed Application Field Plans

The SN74LS247N finds widespread use in electronic devices requiring numerical or alphanumeric display capabilities. Common applications include digital clocks, electronic meters, industrial control panels, and consumer electronics such as calculators and digital watches.

Detailed and Complete Alternative Models

  • Alternative Model 1: CD4511B

    • Category: BCD to 7-segment latch/decoder/driver
    • Characteristics: Low power consumption, direct interface with common-cathode displays
    • Package: 16-pin DIP

  • Alternative Model 2: MM74C922

    • Category: BCD to 7-segment latch/decoder/driver
    • Characteristics: Key-to-display encoding, integral debounce
    • Package: 18-pin DIP

In conclusion, the SN74LS247N is a versatile BCD to 7-segment latch/decoder/driver IC with a wide range of applications in electronic display systems. Its high-speed operation, low power consumption, and compatibility with various display types make it a popular choice among electronics designers and manufacturers.

[Word Count: 529]

Seznam 10 běžných otázek a odpovědí souvisejících s aplikací SN74LS247N v technických řešeních

  1. What is SN74LS247N?

    • SN74LS247N is a BCD-to-7-segment latch/decoder/driver IC, commonly used to convert binary-coded decimal (BCD) input into a 7-segment display output.

  2. What is the pinout configuration of SN74LS247N?

    • The pinout configuration of SN74LS247N includes pins for BCD inputs, segment outputs, and control inputs for latching and blanking.

  3. How do I connect SN74LS247N to a microcontroller or digital circuit?

    • You can connect SN74LS247N to a microcontroller or digital circuit by connecting the BCD input pins to the output pins of the microcontroller and providing appropriate power supply and ground connections.

  4. Can SN74LS247N drive common anode or common cathode displays?

    • SN74LS247N is designed to drive common cathode displays. If you have a common anode display, you may need to use additional external components to interface with the IC.

  5. What is the maximum current that SN74LS247N can sink/source per segment?

    • SN74LS247N can typically sink or source up to 25mA per segment, but it's important to refer to the datasheet for specific details and limitations.

  6. How can I cascade multiple SN74LS247N ICs to drive multiple 7-segment displays?

    • You can cascade multiple SN74LS247N ICs by connecting the BCD inputs of the second IC to the outputs of the first IC and so on, while ensuring proper power supply and ground connections.

  7. What are the typical applications of SN74LS247N?

    • SN74LS247N is commonly used in digital clocks, frequency counters, scoreboards, and any application requiring the display of numerical information using 7-segment displays.

  8. How do I implement blanking and latching control with SN74LS247N?

    • Blanking and latching control can be implemented by connecting the appropriate control pins of SN74LS247N to the microcontroller or digital circuit to enable/disable the display and latch the BCD input, respectively.

  9. What are the voltage requirements for SN74LS247N?

    • SN74LS247N typically operates at a voltage range of 4.75V to 5.25V, making it compatible with standard TTL logic levels.

  10. Are there any precautions to consider when using SN74LS247N?

    • It's important to avoid exceeding the maximum ratings specified in the datasheet, ensure proper decoupling capacitors are used, and follow recommended PCB layout guidelines for optimal performance and reliability.