Texas Instruments
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SN74LS47DG4
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SN74LS47DG4

Product Overview

  • Category: Integrated Circuit (IC)
  • Use: BCD to 7-segment Decoder/Driver
  • Characteristics:
    • Low-power Schottky (LS) technology
    • Directly drives common-cathode LED displays
    • Converts binary-coded decimal (BCD) input to 7-segment display output
  • Package: SOIC (Small Outline Integrated Circuit)
  • Essence: Decodes BCD input and drives 7-segment displays
  • Packaging/Quantity: Available in reels of 2500 pieces

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 Propagation Delay: 35ns
  • Maximum Power Dissipation: 500mW

Detailed Pin Configuration

The SN74LS47DG4 has a total of 16 pins, which are assigned as follows:

  1. A
  2. B
  3. C
  4. D
  5. LT (Lamp Test)
  6. RBI (Ripple Blanking Input)
  7. RBO (Ripple Blanking Output)
  8. GND (Ground)
  9. a
  10. b
  11. c
  12. d
  13. e
  14. f
  15. g
  16. VCC (Supply Voltage)

Functional Features

  • BCD to 7-segment decoding: The IC takes a 4-bit BCD input and decodes it to drive the corresponding segments of a 7-segment display.
  • Lamp Test Function: The LT pin allows testing of all the display segments by grounding it.
  • Ripple Blanking: The RBI and RBO pins provide ripple blanking functionality to suppress leading-zero suppression in multiplexed display applications.

Advantages and Disadvantages

Advantages: - Low-power consumption due to LS technology - Directly drives common-cathode LED displays - Compact SOIC package for space-saving designs

Disadvantages: - Limited to BCD input, not suitable for other numeric systems - Requires additional circuitry for multiplexed display applications

Working Principles

The SN74LS47DG4 is designed to convert BCD input into the appropriate signals to drive a 7-segment display. The BCD input is provided through pins A, B, C, and D. Based on the input combination, the IC activates the corresponding segments (a-g) of the 7-segment display. The LT pin allows testing of all segments, while RBI and RBO pins enable ripple blanking for multiplexed displays.

Detailed Application Field Plans

The SN74LS47DG4 is commonly used in various applications that require BCD to 7-segment decoding. Some of the typical application fields include:

  1. Digital Clocks: The IC can be used to drive the 7-segment display in digital clocks, converting the BCD time data into readable digits.
  2. Counters: It can be employed in counter circuits to display the count value on a 7-segment display.
  3. Industrial Control Panels: The IC finds use in control panels where numerical information needs to be displayed accurately.
  4. Instrumentation: It can be utilized in various measuring instruments to display readings in a user-friendly format.

Detailed and Complete Alternative Models

  1. CD4511B: BCD to 7-segment latch/decoder/driver IC with similar functionality.
  2. MC14543B: BCD to 7-segment decoder/driver IC with ripple-blanking capability.
  3. HEF4543B: BCD to 7-segment latch/decoder/driver IC with complementary outputs.

These alternative models offer similar functionality and can be used as substitutes for the SN74LS47DG4 in various applications.

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10 domande e risposte comuni relative all'applicazione di SN74LS47DG4 nelle soluzioni tecniche

Sure! Here are 10 common questions and answers related to the application of SN74LS47DG4 in technical solutions:

  1. Q: What is SN74LS47DG4? A: SN74LS47DG4 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: How does SN74LS47DG4 work? A: It takes a 4-bit BCD input and decodes it to drive the appropriate segments of a 7-segment display to represent the corresponding decimal digit.

  3. Q: What is the maximum frequency at which SN74LS47DG4 can operate? A: The maximum operating frequency for SN74LS47DG4 is typically around 24 MHz.

  4. Q: Can SN74LS47DG4 directly drive a common cathode 7-segment display? A: No, SN74LS47DG4 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: How many 7-segment displays can be driven by a single SN74LS47DG4 IC? A: SN74LS47DG4 can drive one 7-segment display. If you need to drive multiple displays, you will need additional ICs or multiplexing techniques.

  6. Q: What is the maximum current that SN74LS47DG4 can sink/source per segment? A: SN74LS47DG4 can typically sink/source up to 20 mA per segment.

  7. Q: Can SN74LS47DG4 handle higher voltages than the typical 5V supply? A: No, SN74LS47DG4 is designed to operate with a 5V supply voltage. Using higher voltages may damage the IC.

  8. Q: Can SN74LS47DG4 be used with microcontrollers or Arduino boards? A: Yes, SN74LS47DG4 can be easily interfaced with microcontrollers or Arduino boards to display numeric values on a 7-segment display.

  9. Q: Does SN74LS47DG4 have built-in current limiting resistors for the segments? A: No, SN74LS47DG4 does not have built-in current limiting resistors. External resistors are required to limit the current through the segments.

  10. Q: Are there any alternative ICs to SN74LS47DG4 for BCD-to-7-segment decoding? A: Yes, there are other ICs available such as CD4511, CD4026, or MAX7219 that can perform similar functions and may offer additional features.

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