ON Semiconductor
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DM74ALS257MX
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DM74ALS257MX

Product Overview

  • Category: Integrated Circuit (IC)
  • Use: Data Multiplexer
  • Characteristics: High-speed, TTL-compatible, 3-state outputs
  • Package: 16-pin SOIC (Small Outline Integrated Circuit)
  • Essence: The DM74ALS257MX is a data multiplexer IC that allows multiple input signals to be selected and routed to a single output line.
  • Packaging/Quantity: Available in reels of 2500 units

Specifications

  • Supply Voltage: 4.5V to 5.5V
  • Input Voltage: 0V to VCC
  • Output Voltage: 0V to VCC
  • Operating Temperature: -40°C to +85°C
  • Propagation Delay: 9ns (typical)
  • Output Current: ±24mA

Detailed Pin Configuration

The DM74ALS257MX has a total of 16 pins, each serving a specific purpose:

  1. A0: Address Input 0
  2. A1: Address Input 1
  3. A2: Address Input 2
  4. A3: Address Input 3
  5. I0: Data Input 0
  6. I1: Data Input 1
  7. I2: Data Input 2
  8. I3: Data Input 3
  9. E: Enable Input
  10. Y: Output
  11. GND: Ground
  12. I4: Data Input 4
  13. I5: Data Input 5
  14. I6: Data Input 6
  15. I7: Data Input 7
  16. VCC: Supply Voltage

Functional Features

  • The DM74ALS257MX is designed to handle high-speed data switching operations.
  • It features 3-state outputs, allowing the output line to be disconnected from the internal circuitry when not in use.
  • The enable input (E) controls the selection of data inputs and enables the output.

Advantages and Disadvantages

Advantages

  • High-speed operation allows for efficient data processing.
  • TTL compatibility ensures easy integration with existing systems.
  • 3-state outputs provide flexibility in signal routing.

Disadvantages

  • Limited number of address and data inputs may restrict certain applications.
  • Requires a stable power supply within the specified voltage range for optimal performance.

Working Principles

The DM74ALS257MX operates by using the address inputs (A0-A3) to select one of the eight data inputs (I0-I7). The selected data input is then routed to the output (Y) when the enable input (E) is active. When the enable input is inactive, the output is disconnected from the internal circuitry, resulting in a high-impedance state.

Detailed Application Field Plans

The DM74ALS257MX can be used in various applications that require data multiplexing, such as:

  1. Data communication systems
  2. Digital signal processing
  3. Multiplexed data storage
  4. Address decoding circuits
  5. Data routing in microprocessors

Detailed and Complete Alternative Models

  1. SN74ALS257N: Similar data multiplexer IC with DIP (Dual Inline Package) packaging.
  2. CD74ALS257M: Equivalent data multiplexer IC with different pin configuration but similar characteristics.
  3. MC74ALS257D: Alternative data multiplexer IC with SOIC package and improved propagation delay.

These alternative models offer similar functionality and can be considered as substitutes for the DM74ALS257MX depending on specific requirements.

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Seznam 10 běžných otázek a odpovědí souvisejících s aplikací DM74ALS257MX v technických řešeních

Sure! Here are 10 common questions and answers related to the application of DM74ALS257MX in technical solutions:

  1. Q: What is DM74ALS257MX? A: DM74ALS257MX is a quad 2-input multiplexer with tri-state outputs, commonly used in digital logic circuits.

  2. Q: What are the key features of DM74ALS257MX? A: Some key features include four independent 2-input multiplexers, tri-state outputs, and compatibility with TTL logic levels.

  3. Q: How can DM74ALS257MX be used in technical solutions? A: It can be used for data routing, signal selection, or as a general-purpose multiplexer in various digital systems.

  4. Q: What is the maximum operating frequency of DM74ALS257MX? A: The maximum operating frequency is typically around 100 MHz.

  5. Q: Can DM74ALS257MX handle both analog and digital signals? A: No, DM74ALS257MX is designed specifically for digital signals and is not suitable for handling analog signals.

  6. Q: What is the power supply voltage range for DM74ALS257MX? A: The recommended power supply voltage range is typically between 4.75V and 5.25V.

  7. Q: Does DM74ALS257MX have built-in protection against overvoltage or ESD? A: No, DM74ALS257MX does not have built-in protection against overvoltage or electrostatic discharge (ESD). External protection measures may be required.

  8. Q: Can DM74ALS257MX drive high capacitive loads? A: Yes, DM74ALS257MX has a relatively strong output driver capability and can drive moderate capacitive loads without additional buffering.

  9. Q: What is the typical propagation delay of DM74ALS257MX? A: The typical propagation delay is around 10-15 nanoseconds.

  10. Q: Are there any recommended application circuits or reference designs available for DM74ALS257MX? A: Yes, the datasheet for DM74ALS257MX usually provides example application circuits and reference designs that can be used as a starting point for implementation.

Please note that these answers are general and may vary depending on specific datasheets and manufacturer specifications.