ON Semiconductor
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DM74AS244SJ
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DM74AS244SJ

Overview

  • Category: Integrated Circuit
  • Use: Signal Buffer/Line Driver
  • Characteristics: High-speed, TTL-compatible, 3-state outputs
  • Package: SOIC (Small Outline Integrated Circuit)
  • Essence: Buffering and driving signals in digital systems
  • Packaging/Quantity: Tape and Reel, 2500 pieces per reel

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 Time: 10ns (typical)
  • Output Current: ±24mA

Pin Configuration

The DM74AS244SJ has a 20-pin configuration with the following pin assignments:

  1. GND (Ground)
  2. A1 (Input A1)
  3. B1 (Input B1)
  4. Y1 (Output Y1)
  5. A2 (Input A2)
  6. B2 (Input B2)
  7. Y2 (Output Y2)
  8. GND (Ground)
  9. Y3 (Output Y3)
  10. A3 (Input A3)
  11. B3 (Input B3)
  12. GND (Ground)
  13. Y4 (Output Y4)
  14. A4 (Input A4)
  15. B4 (Input B4)
  16. Vcc (Supply Voltage)
  17. OE (Output Enable)
  18. GND (Ground)
  19. Y5 (Output Y5)
  20. A5 (Input A5)

Functional Features

  • High-speed operation: The DM74AS244SJ is designed for high-speed digital systems, ensuring fast signal buffering and driving.
  • TTL compatibility: It is compatible with TTL (Transistor-Transistor Logic) levels, allowing seamless integration with existing TTL-based circuits.
  • 3-state outputs: The device features 3-state outputs, enabling the connection of multiple devices without bus contention issues.

Advantages and Disadvantages

Advantages: - High-speed operation allows for efficient signal buffering and driving in digital systems. - TTL compatibility ensures easy integration with existing TTL-based circuits. - 3-state outputs enable the connection of multiple devices without bus contention problems.

Disadvantages: - Limited supply voltage range (4.5V to 5.5V). - Relatively high propagation delay time compared to newer buffer/driver ICs.

Working Principles

The DM74AS244SJ operates by receiving input signals on its A1-A5 and B1-B4 pins. These signals are buffered and amplified internally, and the resulting output signals appear on the Y1-Y5 pins. The OE pin controls the output enable/disable state of the device. When OE is low, the outputs are enabled and actively driven. Conversely, when OE is high, the outputs are disabled and enter a high-impedance state.

Detailed Application Field Plans

The DM74AS244SJ finds applications in various digital systems where signal buffering and driving are required. Some common application fields include:

  1. Microprocessors and microcontrollers
  2. Memory systems
  3. Communication interfaces
  4. Data acquisition systems
  5. Industrial automation

Alternative Models

  1. SN74LS244: Low-power Schottky TTL-compatible octal buffer/driver
  2. CD74HC244: High-speed CMOS octal buffer/driver
  3. MC74ACT244: Advanced CMOS octal buffer/driver

These alternative models offer similar functionality to the DM74AS244SJ and can be used as replacements depending on specific requirements.

Word count: 386 words

Seznam 10 běžných otázek a odpovědí souvisejících s aplikací DM74AS244SJ v technických řešeních

Sure! Here are 10 common questions and answers related to the application of DM74AS244SJ in technical solutions:

  1. Q: What is DM74AS244SJ? A: DM74AS244SJ is a specific type of integrated circuit (IC) known as a buffer/line driver. It is commonly used for signal amplification and isolation purposes.

  2. Q: What is the purpose of using DM74AS244SJ in a technical solution? A: DM74AS244SJ can be used to amplify weak signals, provide signal buffering, and isolate different sections of a circuit to prevent interference.

  3. Q: What voltage levels does DM74AS244SJ support? A: DM74AS244SJ supports a wide range of voltage levels, typically from 2V to 6V.

  4. Q: How many input/output pins does DM74AS244SJ have? A: DM74AS244SJ has 8 input pins and 8 output pins, making it suitable for applications that require multiple signal lines.

  5. Q: Can DM74AS244SJ handle bidirectional signals? A: No, DM74AS244SJ is unidirectional, meaning it can only amplify or buffer signals in one direction.

  6. Q: What is the maximum current that DM74AS244SJ can drive? A: DM74AS244SJ can typically drive up to 24mA of current per output pin.

  7. Q: Is DM74AS244SJ compatible with TTL logic levels? A: Yes, DM74AS244SJ is designed to be compatible with TTL (Transistor-Transistor Logic) logic levels.

  8. Q: Can DM74AS244SJ be cascaded to increase the number of input/output lines? A: Yes, multiple DM74AS244SJ ICs can be cascaded together to increase the number of input/output lines in a circuit.

  9. Q: Does DM74AS244SJ require external power supply decoupling capacitors? A: Yes, it is recommended to use decoupling capacitors near the power supply pins of DM74AS244SJ to ensure stable operation.

  10. Q: Are there any specific precautions to consider when using DM74AS244SJ? A: It is important to avoid exceeding the maximum voltage and current ratings specified in the datasheet. Additionally, proper grounding and noise isolation techniques should be employed for optimal performance.

Please note that these answers are general and may vary depending on the specific application and requirements. Always refer to the datasheet and consult with technical experts for accurate information.