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SN74LS247DR
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SN74LS247DR

Product Overview

Category

The SN74LS247DR belongs to the category of integrated circuits (ICs), specifically in the family of digital decoders/demultiplexers.

Use

It is commonly used for converting binary-coded decimal (BCD) input data into seven-segment display outputs for driving a common-cathode LED display.

Characteristics

  • Low power consumption
  • High speed
  • Wide operating voltage range
  • TTL compatible inputs

Package

The SN74LS247DR is available in a 16-pin dual in-line package (DIP).

Essence

This IC serves as a BCD-to-seven-segment latch/decoder/driver, essential for displaying numerical information on a seven-segment display.

Packaging/Quantity

It is typically packaged in tubes or reels and is available in various quantities depending on the supplier.

Specifications

  • Supply Voltage: 4.75V to 5.25V
  • Operating Temperature: -40°C to 85°C
  • Output Current: 20mA per segment
  • Maximum Clock Frequency: 30MHz

Detailed Pin Configuration

  1. A0 (BCD Input)
  2. A1 (BCD Input)
  3. A2 (BCD Input)
  4. A3 (BCD Input)
  5. LT (Latch Enable)
  6. BI/RBO (Blanking Input/Ripple Blanking Output)
  7. a (Segment Output)
  8. f (Segment Output)
  9. COM (Common Cathode)
  10. b (Segment Output)
  11. g (Segment Output)
  12. c (Segment Output)
  13. d (Segment Output)
  14. e (Segment Output)
  15. VCC (Supply Voltage)
  16. GND (Ground)

Functional Features

The SN74LS247DR integrates a BCD-to-seven-segment decoder, which takes BCD input and drives a seven-segment display. It also includes a latch to store the BCD input and a blanking input for controlling the display output.

Advantages

  • Low power consumption makes it suitable for battery-powered applications.
  • High-speed operation allows for rapid display updates.
  • Wide operating voltage range provides flexibility in different power supply scenarios.

Disadvantages

  • Limited to driving common-cathode displays only.
  • Requires external current-limiting resistors for each segment.

Working Principles

When a BCD input is applied, the latch stores the data and the decoder converts it into signals to drive the corresponding segments of the seven-segment display. The blanking input can be used to control the display output.

Detailed Application Field Plans

The SN74LS247DR is widely used in electronic devices that require numerical display, such as digital clocks, electronic meters, and instrumentation panels. It is also utilized in consumer electronics like microwave ovens and calculators.

Detailed and Complete Alternative Models

  • CD4511B: Similar BCD-to-seven-segment latch/decoder/driver IC
  • DM9368: Another option for BCD-to-seven-segment decoding and display driving

In conclusion, the SN74LS247DR is a versatile IC with a wide range of applications in digital display systems, offering efficient BCD-to-seven-segment conversion and driving capabilities.

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قم بإدراج 10 أسئلة وإجابات شائعة تتعلق بتطبيق SN74LS247DR في الحلول التقنية

  1. What is the SN74LS247DR?

    • The SN74LS247DR 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 maximum voltage rating for SN74LS247DR?

    • The maximum voltage rating for SN74LS247DR is typically around 5.25V.

  3. How many BCD inputs does SN74LS247DR have?

    • SN74LS247DR has 4 BCD inputs, allowing it to accept a 4-bit BCD code.

  4. What is the maximum current output of SN74LS247DR?

    • The maximum current output per segment for SN74LS247DR is usually around 25mA.

  5. Can SN74LS247DR directly drive a common anode 7-segment display?

    • No, SN74LS247DR is designed to drive common cathode 7-segment displays. For common anode displays, additional circuitry is required.

  6. What is the typical propagation delay of SN74LS247DR?

    • The typical propagation delay of SN74LS247DR is in the range of 30-60 nanoseconds.

  7. Is SN74LS247DR suitable for automotive applications?

    • Yes, SN74LS247DR is often used in automotive applications due to its reliability and compatibility with automotive voltage levels.

  8. Can SN74LS247DR be cascaded to drive multiple 7-segment displays?

    • Yes, multiple SN74LS247DRs can be cascaded to drive multiple 7-segment displays using the BCD outputs of one IC as the inputs for the next.

  9. What are the typical operating temperature ranges for SN74LS247DR?

    • The typical operating temperature range for SN74LS247DR is -40°C to 85°C.

  10. Does SN74LS247DR require external pull-up or pull-down resistors?

    • No, SN74LS247DR has internal pull-up and pull-down resistors, eliminating the need for external ones in most cases.