SN74LS148NSR

Product Overview

• Category: Integrated Circuit (IC)
• Use: Encoder
• Characteristics: TTL Logic, 8-Line to 3-Line Priority Encoder
• Package: SOP (Small Outline Package)
• Essence: High-speed encoding of multiple input lines into a smaller number of output lines
• Packaging/Quantity: Tape and Reel, 2,500 units per reel

Specifications

• Supply Voltage: 4.75V to 5.25V
• Input Voltage: 0V to VCC
• Output Voltage: 0V to VCC
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay Time: 18ns (typical)
• Power Dissipation: 45mW (typical)

Detailed Pin Configuration

The SN74LS148NSR has a total of 16 pins, which are assigned as follows:

1. GND (Ground)
2. A0 (Input Line A0)
3. A1 (Input Line A1)
4. A2 (Input Line A2)
5. A3 (Input Line A3)
6. A4 (Input Line A4)
7. A5 (Input Line A5)
8. A6 (Input Line A6)
9. A7 (Input Line A7)
10. EO (Enable Output)
11. Y0 (Output Line Y0)
12. Y1 (Output Line Y1)
13. Y2 (Output Line Y2)
14. VCC (Supply Voltage)
15. NC (No Connection)
16. GND (Ground)

Functional Features

The SN74LS148NSR is a priority encoder that encodes eight input lines (A0-A7) into three output lines (Y0-Y2). It uses TTL logic and operates at high speed. The encoder has an enable output (EO) pin, which when low, enables the outputs to respond to the inputs. The priority encoding feature ensures that only the highest priority input is encoded.

Advantages and Disadvantages

Advantages: - High-speed encoding - Compact size due to integration of multiple functions - Easy to interface with other digital circuits

Disadvantages: - Limited number of input lines (8 in this case) - Requires external enable signal for proper operation

Working Principles

The SN74LS148NSR works by assigning a priority to each input line based on its position. The highest priority input line with a logic high level will be encoded into the corresponding output line. If multiple input lines have a logic high level simultaneously, the one with the highest priority will be encoded. The enable output (EO) pin controls the activation of the output lines.

Detailed Application Field Plans

The SN74LS148NSR can be used in various applications where encoding of multiple input lines into a smaller number of output lines is required. Some potential application fields include:

1. Data transmission systems
2. Address decoding in memory devices
3. Priority-based interrupt handling in microcontrollers
4. Multiplexing and demultiplexing circuits
5. Control systems requiring priority-based decision making

Detailed and Complete Alternative Models

Some alternative models that provide similar functionality to the SN74LS148NSR are:

1. 74HC148: CMOS Logic, 8-Line to 3-Line Priority Encoder
2. CD74HCT148: High-Speed CMOS Logic, 8-Line to 3-Line Priority Encoder
3. SN54/74LS147: TTL Logic, 10-Line to 4-Line Priority Encoder

These alternative models offer different characteristics and specifications, allowing users to choose the most suitable option for their specific requirements.

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