SN74HC148NSR

Product Overview

• Category: Integrated Circuit (IC)
• Use: Priority Encoder
• Characteristics:
  • High-speed CMOS technology
  • 8-line to 3-line priority encoder
  • Active-low inputs and outputs
  • Wide operating voltage range: 2V to 6V
• Package: SOIC-16
• Essence: The SN74HC148NSR is a priority encoder IC that encodes the highest-priority active input into a binary code.
• Packaging/Quantity: Available in reels of 2500 units.

Specifications

• Supply Voltage Range: 2V to 6V
• Input Voltage Range: 0V to VCC
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay: 15 ns (typical)
• Output Current: ±25 mA
• Power Dissipation: 500 mW (max)

Detailed Pin Configuration

The SN74HC148NSR has a total of 16 pins, which are assigned as follows:

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

Functional Features

• Converts 8-line input data into a 3-bit binary output
• Prioritizes the highest active input line
• Active-low inputs and outputs for easy integration with other components
• Wide operating voltage range allows for flexibility in various applications

Advantages and Disadvantages

Advantages: - High-speed operation due to CMOS technology - Compact SOIC-16 package for space-saving designs - Active-low inputs and outputs simplify circuit design - Wide operating voltage range enhances versatility

Disadvantages: - Limited number of input lines (8) - Only encodes the highest-priority active input

Working Principles

The SN74HC148NSR is a priority encoder that assigns a binary code to the highest-priority active input. It operates by scanning the input lines from A0 to A7 and identifying the first active (low) input. The corresponding binary code is then generated on the output lines Y0, Y1, and Y2. The EO (Enable Output) pin indicates if any input is active, while the E1 and E2 pins control the enable function.

Detailed Application Field Plans

The SN74HC148NSR is commonly used in applications where priority encoding is required. Some potential application fields include:

1. Interrupt handling in microcontrollers
2. Data multiplexing and demultiplexing
3. Address decoding in memory systems
4. Priority-based control systems
5. Traffic signal control units

Detailed and Complete Alternative Models

1. CD74HC148E - DIP-16 package, similar functionality
2. SN54HC148J - Ceramic DIP-16 package, extended temperature range
3. 74HCT148N - DIP-16 package, TTL-compatible inputs

These alternative models offer similar functionality to the SN74HC148NSR and can be considered based on specific requirements or availability.

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