Texas Instruments
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SN74LS47DR
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SN74LS47DR

Product Overview

  • Category: Integrated Circuit (IC)
  • Use: BCD to 7-segment Decoder/Driver
  • Characteristics:
    • Converts Binary-Coded Decimal (BCD) input into a 7-segment display output
    • Drives common-cathode LED or LCD displays
    • Low power consumption
    • Wide operating voltage range
  • Package: SOIC (Small Outline Integrated Circuit)
  • Essence: Decodes BCD input and drives 7-segment displays
  • Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

  • Supply Voltage Range: 4.75V to 5.25V
  • Input Voltage Range: 0V to Vcc
  • Output Voltage Range: 0V to Vcc
  • Operating Temperature Range: -40°C to +85°C
  • Maximum Power Dissipation: 500mW
  • Maximum Input Current: ±1mA
  • Maximum Output Current: ±20mA

Detailed Pin Configuration

The SN74LS47DR has a total of 16 pins:

  1. A - BCD Input A
  2. B - BCD Input B
  3. C - BCD Input C
  4. D - BCD Input D
  5. LT - Lamp Test Input
  6. BI/RBO - Blanking Input / Ripple Blanking Output
  7. a - Segment a Output
  8. b - Segment b Output
  9. c - Segment c Output
  10. d - Segment d Output
  11. e - Segment e Output
  12. f - Segment f Output
  13. g - Segment g Output
  14. Vcc - Positive Power Supply
  15. GND - Ground
  16. RBO - Ripple Blanking Output

Functional Features

  • Converts BCD input into the corresponding 7-segment display output
  • Supports common-cathode LED or LCD displays
  • Provides a lamp test input for testing the display
  • Offers blanking input and ripple blanking output for display control

Advantages and Disadvantages

Advantages: - Efficient BCD to 7-segment decoding - Low power consumption - Wide operating voltage range allows flexibility in various applications

Disadvantages: - Limited to driving common-cathode displays only - Requires external components for current limiting and display control

Working Principles

The SN74LS47DR is designed to decode BCD input and drive 7-segment displays. It utilizes internal logic circuits to convert the BCD code into the appropriate signals for each segment of the display. The outputs are then used to drive the corresponding segments, illuminating the desired numbers or characters.

Detailed Application Field Plans

The SN74LS47DR is commonly used in various applications that require BCD to 7-segment decoding and display. Some typical application fields include:

  1. Digital clocks and timers
  2. Counters and frequency meters
  3. Industrial control panels
  4. Instrumentation displays
  5. Scoreboards and score displays
  6. Electronic voting machines

Detailed and Complete Alternative Models

  1. CD4511 - BCD to 7-segment Latch/Decoder/Driver
  2. MM74C48 - BCD to 7-segment Decoder/Driver
  3. DM9368 - BCD to 7-segment Decoder/Driver
  4. HEF4543B - BCD to 7-segment Decoder/Driver
  5. MC14543B - BCD to 7-segment Decoder/Driver

These alternative models offer similar functionality and can be used as substitutes for the SN74LS47DR in various applications.

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Liste 10 almindelige spørgsmål og svar relateret til anvendelsen af SN74LS47DR i tekniske løsninger

Sure! Here are 10 common questions and answers related to the application of SN74LS47DR in technical solutions:

  1. Q: What is SN74LS47DR? A: SN74LS47DR is a BCD-to-7-segment decoder/driver IC, commonly used to convert binary-coded decimal (BCD) inputs into a 7-segment display output.

  2. Q: What is the maximum supply voltage for SN74LS47DR? A: The maximum supply voltage for SN74LS47DR is 5.25V.

  3. Q: How many BCD inputs does SN74LS47DR have? A: SN74LS47DR has 4 BCD inputs (A, B, C, and D) which can represent numbers from 0 to 9.

  4. Q: Can SN74LS47DR directly drive a common cathode 7-segment display? A: No, SN74LS47DR is designed to drive a common anode 7-segment display. For a common cathode display, an additional inverter or driver circuit is required.

  5. Q: What is the maximum sink current per segment for SN74LS47DR? A: The maximum sink current per segment for SN74LS47DR is 24mA.

  6. Q: How many segments can SN74LS47DR drive? A: SN74LS47DR can drive up to 7 segments of a 7-segment display (including the decimal point).

  7. Q: Can SN74LS47DR be cascaded to drive multiple 7-segment displays? A: Yes, SN74LS47DR can be cascaded to drive multiple 7-segment displays by connecting the outputs of one IC to the inputs of another.

  8. Q: What is the purpose of the LT/BI input in SN74LS47DR? A: The LT/BI (Lamp Test/Blanking Input) pin is used to test the display or blank it by grounding the input.

  9. Q: Can SN74LS47DR be used with microcontrollers or Arduino boards? A: Yes, SN74LS47DR can be easily interfaced with microcontrollers or Arduino boards to display numeric values on a 7-segment display.

  10. Q: Are there any precautions to consider when using SN74LS47DR? A: It is important to ensure that the supply voltage does not exceed 5.25V and that the maximum sink current per segment is not exceeded to prevent damage to the IC and the display.

Please note that these answers are general and may vary depending on specific application requirements.