Texas Instruments
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SN74ALS259DR
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SN74ALS259DR

Product Overview

  • Category: Integrated Circuit (IC)
  • Use: Data Selector/Multiplexer
  • Characteristics: High-speed, TTL-compatible, 8-bit multiplexer with 3-state outputs
  • Package: SOIC (Small Outline Integrated Circuit)
  • Essence: The SN74ALS259DR is a versatile IC that allows the selection of one out of eight data inputs and routes it to the output. It is commonly used in digital systems where multiple data sources need to be selectively connected to a single output.

Packaging/Quantity

The SN74ALS259DR is available in a standard SOIC package. Each package contains one IC.

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
  • Propagation Delay: 9ns (typical)
  • Output Current: ±24mA

Pin Configuration

The SN74ALS259DR has a total of 16 pins. Here is the detailed pin configuration:

  1. A0: Data Input 0
  2. A1: Data Input 1
  3. A2: Data Input 2
  4. A3: Data Input 3
  5. A4: Data Input 4
  6. A5: Data Input 5
  7. A6: Data Input 6
  8. A7: Data Input 7
  9. G1: Enable Input
  10. G2A, G2B: Select Inputs
  11. Y0: Output
  12. Y1: Output
  13. Y2: Output
  14. Y3: Output
  15. Y4: Output
  16. Vcc: Supply Voltage

Functional Features

  • 8-bit data selection/multiplexing
  • 3-state outputs for easy bus sharing
  • TTL-compatible inputs and outputs
  • Low power consumption
  • High-speed operation

Advantages and Disadvantages

Advantages

  • Versatile multiplexer with multiple data inputs
  • Allows selective routing of data to a single output
  • 3-state outputs facilitate bus sharing
  • Compatible with TTL logic levels
  • High-speed operation

Disadvantages

  • Limited to 8-bit data selection
  • Requires external control signals for proper operation
  • Not suitable for applications requiring higher data width

Working Principles

The SN74ALS259DR operates based on the principle of data selection and multiplexing. The input data lines (A0-A7) are connected to various data sources, while the select inputs (G2A, G2B) determine which input is routed to the output (Y0-Y4). The enable input (G1) controls the overall operation of the IC.

When the enable input is active (low), the selected data input is passed through to the output. When the enable input is inactive (high), the outputs are in a high-impedance state, allowing other devices to drive the bus.

Detailed Application Field Plans

The SN74ALS259DR finds applications in various digital systems where data selection and multiplexing are required. Some common application areas include:

  1. Data acquisition systems
  2. Communication systems
  3. Industrial automation
  4. Test and measurement equipment
  5. Digital signal processing

Detailed and Complete Alternative Models

Here are some alternative models that offer similar functionality:

  1. CD74HC257E
  2. MC74HC157AN
  3. 74F157APC
  4. SN54LS157J
  5. 74ACT157SC

These alternatives can be considered based on specific requirements and availability.

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Seznam 10 běžných otázek a odpovědí souvisejících s aplikací SN74ALS259DR v technických řešeních

Sure! Here are 10 common questions and answers related to the application of SN74ALS259DR in technical solutions:

  1. Q: What is SN74ALS259DR? A: SN74ALS259DR is a specific type of integrated circuit (IC) known as a 8-bit addressable latch with 3-state outputs.

  2. Q: What is the purpose of SN74ALS259DR? A: SN74ALS259DR is commonly used to store and control data in digital systems, allowing for efficient addressing and manipulation of multiple devices.

  3. Q: How many bits can SN74ALS259DR store? A: SN74ALS259DR can store up to 8 bits of data, making it suitable for applications that require handling multiple signals or addresses.

  4. Q: What are the voltage requirements for SN74ALS259DR? A: SN74ALS259DR operates within a voltage range of 4.5V to 5.5V, making it compatible with standard TTL logic levels.

  5. Q: Can SN74ALS259DR handle bidirectional data flow? A: No, SN74ALS259DR is unidirectional and can only handle data flow in one direction.

  6. Q: How does SN74ALS259DR achieve 3-state outputs? A: SN74ALS259DR has an enable pin (G) that allows the outputs to be put into a high-impedance state, effectively disconnecting them from the system.

  7. Q: Can SN74ALS259DR be cascaded to increase the number of addressable bits? A: Yes, multiple SN74ALS259DR ICs can be cascaded together to increase the number of addressable bits, allowing for larger systems.

  8. Q: What is the maximum frequency at which SN74ALS259DR can operate? A: SN74ALS259DR has a maximum operating frequency of around 25 MHz, making it suitable for many digital applications.

  9. Q: Are there any special considerations for power supply decoupling with SN74ALS259DR? A: Yes, it is recommended to use decoupling capacitors near the power supply pins of SN74ALS259DR to ensure stable operation and minimize noise.

  10. Q: Can SN74ALS259DR be used in both commercial and industrial applications? A: Yes, SN74ALS259DR is designed to meet the requirements of both commercial and industrial temperature ranges, making it versatile for various applications.

Please note that these answers are general and may vary depending on specific application requirements and datasheet specifications.