SN74LS145DR

Product Overview

• Category: Integrated Circuit (IC)
• Use: BCD to Decimal Decoder
• Characteristics:
  • Low-power Schottky (LS) technology
  • 4-line to 10-line decoding
  • Active low outputs
  • Wide supply voltage range: 4.75V to 5.25V
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: Converts Binary Coded Decimal (BCD) input into a decimal output
• Packaging/Quantity: Tape and Reel, 2500 units per reel

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
• Propagation Delay Time: 15ns (typical)
• Maximum Quiescent Current: 8mA
• Maximum Output Current: 8mA

Detailed Pin Configuration

The SN74LS145DR has the following pin configuration:

1. A0 (Input)
2. A1 (Input)
3. A2 (Input)
4. A3 (Input)
5. /G1 (Input)
6. /G2A (Input)
7. /G2B (Input)
8. /G2C (Input)
9. /G2D (Input)
10. /LT (Input)
11. E (Enable Input)
12. D0 (Output)
13. D1 (Output)
14. D2 (Output)
15. D3 (Output)
16. D4 (Output)
17. D5 (Output)
18. D6 (Output)
19. D7 (Output)
20. GND (Ground)
21. Vcc (Power Supply)

Functional Features

The SN74LS145DR is a BCD to Decimal Decoder IC that converts a 4-line Binary Coded Decimal input into a decimal output. It features active low outputs, which means the outputs are active when their corresponding enable inputs are low. The decoder has four enable inputs (/G2A, /G2B, /G2C, /G2D) that control the decoding of the BCD input.

Advantages and Disadvantages

Advantages: - Low-power consumption due to LS technology - Wide supply voltage range allows for flexibility in different applications - Active low outputs simplify interfacing with other components

Disadvantages: - Limited to 4-line BCD input decoding - Requires external enable signals for proper operation

Working Principles

The SN74LS145DR works by taking a 4-line BCD input and decoding it into a decimal output. The enable inputs (/G2A, /G2B, /G2C, /G2D) control the decoding process. When the enable inputs are low, the corresponding outputs (D0-D9) become active and represent the decoded decimal value. The active low outputs allow for easy integration with other components in digital systems.

Detailed Application Field Plans

The SN74LS145DR can be used in various applications where BCD to decimal decoding is required. Some potential application fields include:

1. Seven-Segment Display Drivers: The decoder can be used to drive seven-segment displays, converting BCD input into the appropriate decimal representation for display purposes.
2. Digital Counters: The IC can be used in digital counters to decode the count value and display it on a seven-segment display or other output devices.
3. Data Encoding: The decoder can be utilized in data encoding systems where BCD input needs to be converted into decimal format for further processing.

Detailed and Complete Alternative Models

1. CD4511: BCD to 7-Segment Decoder/Driver IC
2. 74HC4511: BCD to 7-Segment Latch/Decoder/Driver IC
3. CD4028: BCD to Decimal Decoder IC

These alternative models offer similar functionality to the SN74LS145DR and can be used as substitutes depending on specific requirements.

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