SN74HC148DWR

Product Overview

• Category: Integrated Circuit (IC)
• Use: Priority Encoder
• Characteristics: High-speed, low-power consumption
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: Encodes the highest priority input into a binary code
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage Range: 2V to 6V
• Input Voltage Range: 0V to VCC
• Output Voltage Range: 0V to VCC
• Operating Temperature Range: -40°C to +85°C
• Number of Inputs: 8
• Number of Outputs: 3
• Logic Family: HC (High-Speed CMOS)

Detailed Pin Configuration

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

Functional Features

• Priority encoding of 8 inputs
• Encodes the highest priority input into a 3-bit binary code
• Active-low outputs for easy interfacing with other devices
• Fast propagation delay for high-speed applications
• Low power consumption for energy efficiency

Advantages and Disadvantages

Advantages

• High-speed operation allows for quick data processing
• Low power consumption reduces energy usage
• Small package size saves board space
• Active-low outputs simplify interfacing with other devices

Disadvantages

• Limited number of inputs and outputs
• Requires external enable inputs for proper operation
• Not suitable for applications requiring more than 8 inputs

Working Principles

The SN74HC148DWR is a priority encoder that assigns a unique binary code to the highest priority active input. It operates by scanning the inputs from A0 to A7 and identifying the first active (logic high) input. The corresponding binary code is then generated on the outputs E1, E2, and E3.

The enable inputs (E1, E2, and E3) control the operation of the priority encoder. When all enable inputs are high, the encoder is enabled and scans the inputs. If any of the enable inputs are low, the encoder is disabled and the outputs remain in a high-impedance state.

Detailed Application Field Plans

The SN74HC148DWR is commonly used in various applications where priority encoding is required. Some of the application fields include:

1. Data communication systems: Prioritizing data packets based on their importance.
2. Industrial automation: Assigning priorities to different control signals.
3. Traffic control systems: Managing traffic flow by prioritizing different signals.
4. Robotics: Determining the highest priority task for a robot to perform.
5. Security systems: Encoding alarm signals based on their urgency.

Detailed and Complete Alternative Models

1. CD74HC148E: DIP (Dual Inline Package) version of the SN74HC148DWR.
2. SN74LS148N: Low-power Schottky version of the priority encoder.
3. CD4512BE: 4-to-10 line priority encoder with similar functionality.

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