SN74LS348DRE4

Product Overview

• Category: Integrated Circuit (IC)
• Use: Decoder/Driver
• Characteristics:
  • Low-power Schottky TTL technology
  • 8-line to 3-line priority encoder
  • Open-collector outputs
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: Converts 8 input lines into a 3-bit binary output
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage Range: 4.75V to 5.25V
• Input Voltage Range: 0V to 5.25V
• Operating Temperature Range: -40°C to +85°C
• Output Current: 8 mA
• Propagation Delay Time: 15 ns
• Power Dissipation: 500 mW

Detailed Pin Configuration

The SN74LS348DRE4 has a total of 16 pins:

1. GND (Ground)
2. A0 (Input Line 0)
3. A1 (Input Line 1)
4. A2 (Input Line 2)
5. A3 (Input Line 3)
6. A4 (Input Line 4)
7. A5 (Input Line 5)
8. A6 (Input Line 6)
9. A7 (Input Line 7)
10. E1 (Enable Input 1)
11. E2 (Enable Input 2)
12. E3 (Enable Input 3)
13. Y0 (Output Line 0)
14. Y1 (Output Line 1)
15. Y2 (Output Line 2)
16. VCC (Supply Voltage)

Functional Features

The SN74LS348DRE4 is an 8-line to 3-line priority encoder. It encodes the highest-priority active input line into a 3-bit binary output. The priority is determined by the order of the inputs, with A0 being the highest priority and A7 being the lowest. The enable inputs (E1, E2, E3) control the operation of the encoder.

Advantages and Disadvantages

Advantages: - Low-power consumption due to Schottky TTL technology - Open-collector outputs allow for easy interfacing with other devices - Compact SOIC package saves board space

Disadvantages: - Limited to encoding 8 input lines into 3 output bits - Propagation delay may affect real-time applications

Working Principles

The SN74LS348DRE4 works by prioritizing the active input lines based on their order. When multiple input lines are active simultaneously, the highest-priority line is encoded into a 3-bit binary output. The enable inputs determine which output line is enabled.

Detailed Application Field Plans

The SN74LS348DRE4 is commonly used in various applications, including:

1. Priority encoding in microprocessors and computer systems
2. Data multiplexing and demultiplexing
3. Address decoding in memory systems
4. Interrupt handling in embedded systems
5. Priority-based control systems

Detailed and Complete Alternative Models

If the SN74LS348DRE4 is not available or suitable for a specific application, alternative models that provide similar functionality include:

1. SN74LS148: 8-line to 3-line priority encoder with active-low outputs
2. CD74HC148: High-speed CMOS 8-line to 3-line priority encoder
3. MC14532B: 8-line to 3-line priority encoder with buffered outputs

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

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