SN74LS47D

Product Overview

• Category: Integrated Circuit (IC)
• Use: BCD to 7-segment Decoder/Driver
• Characteristics: TTL Logic, Low Power Consumption
• Package: DIP (Dual In-line Package)
• Essence: Converts Binary Coded Decimal (BCD) input into a 7-segment display output
• Packaging/Quantity: Available in tubes or reels, quantity varies depending on supplier

Specifications

• Supply Voltage: 4.75V to 5.25V
• Input Current: 0.8mA (Max)
• Output Current: 3.2mA (Max)
• Operating Temperature: -40°C to +85°C
• Propagation Delay: 30ns (Typical)

Detailed Pin Configuration

The SN74LS47D has a total of 16 pins. The pin configuration is 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 Supply Voltage
15. GND - Ground
16. RBO - Ripple Blanking Output

Functional Features

• Converts BCD input into the corresponding 7-segment display output
• Provides active-low outputs for each segment (a-g) and a ripple blanking output
• Supports lamp test functionality for easy testing of the display
• TTL logic ensures compatibility with other TTL devices
• Low power consumption makes it suitable for battery-powered applications

Advantages and Disadvantages

Advantages

• Simple and straightforward BCD to 7-segment decoding functionality
• Wide operating temperature range allows for use in various environments
• Low power consumption helps conserve energy in portable devices
• TTL logic compatibility ensures easy integration with other TTL devices

Disadvantages

• Limited to BCD input, not suitable for other types of inputs
• Requires an external current-limiting resistor for each segment
• Only supports common cathode 7-segment displays

Working Principles

The SN74LS47D is a BCD to 7-segment decoder/driver IC. It takes a 4-bit BCD input (A, B, C, D) and converts it into the corresponding output signals for driving a 7-segment display. Each segment (a-g) is driven by an active-low output pin. The IC also provides a ripple blanking output (RBO) for synchronizing multiple displays.

When a BCD input is applied, the IC decodes it and activates the appropriate output pins to light up the corresponding segments on the 7-segment display. The lamp test input (LT) can be used to activate all segments simultaneously for testing purposes.

Detailed Application Field Plans

The SN74LS47D 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, providing a clear and readable time display.
2. Counters: It can be used in counter circuits to display the count value on a 7-segment display.
3. Measurement Instruments: The IC can be utilized in measurement instruments to display numerical values accurately.
4. Industrial Control Systems: It finds applications in industrial control systems where numeric data needs to be displayed.

Detailed and Complete Alternative Models

• CD4511: BCD to 7-segment latch/decoder/driver IC
• MM74C48: BCD to 7-segment decoder/driver IC
• CD74HC4511: High-speed CMOS BCD to 7-segment latch/decoder/driver IC

These alternative models provide similar functionality to the SN74LS47D and can be used as replacements depending on specific requirements.

In conclusion, the SN74LS47D is a versatile BCD to 7-segment decoder/driver IC that offers simplicity, low power consumption, and compatibility with TTL logic. Its wide range of applications makes it a popular choice in various electronic projects and systems.