SN74LS47NSR

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: SOIC (Small Outline Integrated Circuit)
• Essence: Decoding and driving BCD inputs to display on 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 Power Dissipation: 500mW
• Maximum Input Current: ±1mA
• Maximum Output Current: ±20mA

Detailed Pin Configuration

The SN74LS47NSR has a total of 16 pins, which are assigned as follows:

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

The SN74LS47NSR is designed to decode and drive BCD inputs to display on 7-segment displays. It accepts a 4-bit BCD input (A, B, C, D) and generates the necessary outputs (a-g) to drive a common-cathode type 7-segment display. The lamp test input (LT) allows all segments to be turned on simultaneously for testing purposes. The blanking input (BI) can be used to turn off all the segments, while the ripple blanking output (RBO) provides a cascading feature for multiple devices.

Advantages and Disadvantages

Advantages: - Efficient BCD to 7-segment decoding and driving - Low power consumption - Wide operating voltage range - Compact SOIC package

Disadvantages: - Limited to driving common-cathode type 7-segment displays - Requires external components for proper operation

Working Principles

The SN74LS47NSR works by accepting a 4-bit BCD input and decoding it into the appropriate outputs to drive a 7-segment display. Each segment of the display is controlled by a corresponding output pin (a-g). By setting the BCD inputs appropriately, the desired number or character can be displayed on the 7-segment display. The lamp test input (LT) and blanking input (BI) provide additional control over the display.

Detailed Application Field Plans

The SN74LS47NSR is commonly used in various applications where BCD inputs need to be displayed on 7-segment displays. Some specific application fields include:

1. Digital clocks and timers
2. Counters and frequency meters
3. Industrial control panels
4. Instrumentation and measurement equipment
5. Consumer electronics, such as calculators and digital meters

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to the SN74LS47NSR include:

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

These alternative models can be considered based on specific requirements and availability.

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