SN74ALS259N

Product Overview

• Category: Integrated Circuit (IC)
• Use: Data Selector/Multiplexer
• Characteristics: High-speed, TTL-compatible, 8-bit input/output, addressable latch
• Package: DIP (Dual In-line Package)
• Essence: A versatile IC that allows for data selection and multiplexing in various applications
• Packaging/Quantity: Available in tubes or reels, typically sold in quantities of 25 or 50 units

Specifications

• Supply Voltage: 4.5V to 5.5V
• Input Voltage: 0V to VCC
• Output Voltage: 0V to VCC
• Operating Temperature Range: -40°C to +85°C
• Logic Family: ALS (Advanced Low-Power Schottky)

Detailed Pin Configuration

The SN74ALS259N has a total of 16 pins, which are arranged as follows:

__ __ A7 |1 \__/ 16| VCC A6 |2 15| OE (Output Enable) A5 |3 14| B (Data Inputs) A4 |4 13| C (Data Inputs) A3 |5 SN 12| D (Data Inputs) A2 |6 74 11| G (Address Inputs) A1 |7 ALS 10| Q (Outputs) A0 |8 9 | Q̅ (Complementary Outputs) |__________|

Functional Features

• Data Selection: The SN74ALS259N allows for the selection of one out of eight data inputs based on the address inputs.
• Multiplexing: It can be used to multiplex multiple data sources onto a single output line.
• Addressable Latch: The latch feature allows the selected data to be stored and held until a new selection is made.
• High-Speed Operation: The ALS technology enables fast switching times, making it suitable for high-speed applications.
• TTL-Compatible: The IC is designed to be compatible with TTL (Transistor-Transistor Logic) voltage levels.

Advantages and Disadvantages

Advantages

• Versatility: Can be used in various applications requiring data selection and multiplexing.
• High-Speed Operation: Enables efficient data processing in time-critical systems.
• TTL Compatibility: Can interface easily with other TTL logic devices.
• Addressable Latch: Allows for temporary storage of selected data.

Disadvantages

• Limited Input/Output Count: Supports up to 8 data inputs and a single output line.
• DIP Package: The dual in-line package may not be suitable for space-constrained designs.
• Power Consumption: As an older technology, it may consume more power compared to newer ICs.

Working Principles

The SN74ALS259N operates based on the principle of address decoding. The address inputs (A0-A7) determine which data input (B-D) is selected. When the Output Enable (OE) pin is active, the selected data is passed through to the outputs (Q and Q̅). The addressable latch feature allows the selected data to be stored and held until a new selection is made.

Detailed Application Field Plans

The SN74ALS259N finds applications in various fields, including:

1. Data Multiplexing: It can be used to combine multiple data sources onto a single output line, such as in communication systems or data acquisition systems.
2. Address Decoding: The IC can be employed in memory systems to decode address lines and select specific memory locations.
3. Digital Control Systems: It can be utilized in digital control circuits to select different control signals based on specific conditions.
4. Arithmetic Logic Units (ALUs): The SN74ALS259N can be part of ALUs to select different data inputs for arithmetic and logical operations.

Detailed and Complete Alternative Models

1. SN74ALS258N: Similar to SN74ALS259N, but with 3-state outputs instead of latched outputs.
2. SN74LS157N: A quad 2-line to 1-line data selector/multiplexer with complementary outputs.
3. CD4051B: An analog multiplexer/demultiplexer IC with 8 channels.

These alternative models offer similar functionality to the SN74ALS259N and can be considered as alternatives based on specific requirements.

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