Texas Instruments
Imej mungkin representasi.
Lihat spesifikasi untuk butiran produk.
SN74LS47N
Lihat Butiran Helaian data

SN74LS47N

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 type 7-segment displays
    • Low power consumption
    • Wide operating voltage range
  • Package: DIP (Dual In-line Package)
  • Essence: Decoding and driving BCD inputs to display numeric values on 7-segment displays
  • Packaging/Quantity: Available in tubes or reels, quantity varies based on supplier

Specifications

  • Supply Voltage Range: 4.75V to 5.25V
  • Input Current: 0.8mA (max)
  • Output Current: 24mA (max)
  • Operating Temperature Range: -40°C to +85°C
  • Propagation Delay Time: 30ns (typical)

Detailed Pin Configuration

  1. A
  2. B
  3. C
  4. D
  5. LT (Lamp Test)
  6. RBI (Ripple Blanking Input)
  7. GND (Ground)
  8. F
  9. E
  10. CARRY OUT
  11. LT (Lamp Test)
  12. RBI (Ripple Blanking Input)
  13. a
  14. b
  15. c
  16. d
  17. e
  18. f
  19. g
  20. VCC (Positive Power Supply)

Functional Features

  • Converts BCD input (A, B, C, D) into corresponding 7-segment display output (a-g)
  • Lamp Test (LT) pin allows testing of the display segments
  • Ripple Blanking Input (RBI) enables blanking of leading/trailing zeros
  • CARRY OUT pin provides cascading capability for multiple displays

Advantages and Disadvantages

Advantages

  • Efficient BCD to 7-segment decoding and driving
  • Low power consumption
  • Wide operating voltage range allows compatibility with various systems
  • Cascading capability simplifies multi-digit display implementation

Disadvantages

  • Limited to common-cathode type 7-segment displays
  • Requires additional components for leading/trailing zero blanking

Working Principles

The SN74LS47N is a BCD to 7-segment decoder/driver IC. It takes Binary-Coded Decimal (BCD) input signals (A, B, C, D) and decodes them to drive the corresponding segments (a-g) of a common-cathode type 7-segment display. The decoded output can represent numeric values from 0 to 9.

The LT (Lamp Test) pin allows testing of the display segments by lighting them all simultaneously. The RBI (Ripple Blanking Input) pin enables blanking of leading/trailing zeros in multi-digit displays.

The CARRY OUT pin provides cascading capability, allowing multiple SN74LS47N devices to be connected together for driving larger displays with more digits.

Detailed Application Field Plans

The SN74LS47N is widely used in applications where BCD inputs need to be displayed on 7-segment displays. Some common application fields include:

  1. Digital clocks and timers
  2. Counters and frequency meters
  3. Industrial control panels
  4. Measurement instruments
  5. Process control systems

Detailed and Complete Alternative Models

  • CD4511: BCD to 7-segment latch/decoder/driver
  • MM74C48: BCD to 7-segment decoder/driver with open-collector outputs
  • HEF4543B: BCD to 7-segment latch/decoder/driver with display memory

These alternative models provide similar functionality to the SN74LS47N and can be used as replacements in various applications.

Word count: 431 words

Senaraikan 10 soalan dan jawapan biasa yang berkaitan dengan aplikasi SN74LS47N dalam penyelesaian teknikal

  1. What is the purpose of SN74LS47N in technical solutions?
    - The SN74LS47N is a BCD to 7-segment decoder/driver IC used to convert binary-coded decimal (BCD) input into a 7-segment display output.

  2. What are the key features of SN74LS47N?
    - The SN74LS47N features active-low outputs, ripple-blanking input, and open-collector outputs for driving common-anode 7-segment displays.

  3. How does SN74LS47N work with BCD inputs?
    - When provided with BCD inputs, the SN74LS47N decodes the input and drives the appropriate segments of a 7-segment display to represent the corresponding decimal digit.

  4. Can SN74LS47N be used with common-cathode displays?
    - No, SN74LS47N is designed to work with common-anode displays and may require additional circuitry to interface with common-cathode displays.

  5. What is the maximum current output of SN74LS47N?
    - The maximum sink current per output of SN74LS47N is typically 24mA, suitable for driving most common-anode 7-segment displays.

  6. How can SN74LS47N be cascaded for larger displays?
    - Multiple SN74LS47N ICs can be cascaded together to decode larger BCD numbers and drive multiple 7-segment displays.

  7. What is the power supply voltage range for SN74LS47N?
    - SN74LS47N operates within a typical power supply voltage range of 4.75V to 5.25V.

  8. Does SN74LS47N have built-in display multiplexing capabilities?
    - No, SN74LS47N does not have built-in display multiplexing capabilities and may require external multiplexing circuitry for driving multiple displays.

  9. Can SN74LS47N be used in automotive applications?
    - Yes, SN74LS47N is suitable for use in automotive applications, provided it meets the required environmental and electrical specifications.

  10. Are there any alternative ICs similar to SN74LS47N?
    - Yes, alternatives to SN74LS47N include other BCD to 7-segment decoder/driver ICs such as CD4511, DM9368, and MM74C48.