SN74HC148N

Product Overview

• Category: Integrated Circuit (IC)
• Use: Priority Encoder
• Characteristics: High-speed, CMOS technology
• Package: DIP (Dual In-line Package)
• Essence: Encodes the highest priority active input into a binary code
• Packaging/Quantity: Available in tubes of 25 or reels of 2,000

Specifications

• Logic Family: HC (High-Speed CMOS)
• Number of Inputs: 8
• Number of Outputs: 3
• Supply Voltage: 2V to 6V
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay: 20 ns (typical)
• Output Current: ±6 mA
• Power Dissipation: 500 mW (max)

Detailed Pin Configuration

The SN74HC148N has a total of 16 pins. The pin configuration is 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. VCC (Power)
14. EO (Output)
15. E1 (Input)
16. E2 (Input)

Functional Features

• Priority encoding of 8 inputs
• Encodes the highest priority active input into a 3-bit binary code
• Active-low enable inputs for cascading multiple devices
• High-speed operation with low power consumption
• Compatible with TTL (Transistor-Transistor Logic) and CMOS logic levels

Advantages and Disadvantages

Advantages

• High-speed operation allows for efficient encoding of priority inputs
• Low power consumption makes it suitable for battery-powered devices
• Compatibility with TTL and CMOS logic levels ensures versatility in various applications

Disadvantages

• Limited number of outputs may restrict certain applications requiring more output options
• Propagation delay of 20 ns may not be suitable for ultra-high-speed applications

Working Principles

The SN74HC148N is a priority encoder that assigns a unique binary code to the highest priority active input. The inputs are encoded based on their priority, with the highest priority input being encoded as "Y0" and the lowest priority input as "Y7". The active-low enable inputs (E1 and E2) allow cascading multiple devices to encode larger numbers of inputs.

Detailed Application Field Plans

The SN74HC148N can be used in various 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

• SN54HC148: Similar functionality but operates at lower temperatures (-55°C to +125°C)
• CD74HC148: Equivalent functionality from a different manufacturer (Texas Instruments)

Note: This is not an exhaustive list of alternative models. Please refer to the manufacturer's datasheets for a complete list.

This entry provides an overview of the SN74HC148N, a priority encoder IC. It includes information about its category, use, characteristics, package, essence, packaging/quantity, specifications, pin configuration, functional features, advantages and disadvantages, working principles, detailed application field plans, and alternative models.