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74HC4538D
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74HC4538D

Product Overview

  • Category: Integrated Circuit (IC)
  • Use: Multivibrator and Timer
  • Characteristics: High-speed operation, low power consumption, wide operating voltage range
  • Package: DIP-16 (Dual In-line Package with 16 pins)
  • Essence: The 74HC4538D is a dual retriggerable precision monostable multivibrator. It can be used to generate accurate time delays or as a frequency divider.
  • Packaging/Quantity: Available in tape and reel packaging, with 2500 units per reel.

Specifications

  • Supply Voltage: 2V to 6V
  • Operating Temperature Range: -40°C to +125°C
  • Propagation Delay: 15 ns at 4.5V supply voltage
  • Trigger Pulse Width: 20 ns to 10 s
  • Output Current: ±25 mA
  • Input Capacitance: 3.5 pF
  • Output Capacitance: 7 pF

Pin Configuration

The 74HC4538D has 16 pins arranged as follows:

___________ | | Q1 -|1 16|- VCC Q2 -|2 15|- MR CP -|3 14|- REXT RD -|4 13|- CEXT RE -|5 12|- Q2 Q1 -|6 11|- Q1 GND-|7 10|- CE A -|8 9|- B |___________|

Functional Features

  • Dual retriggerable monostable multivibrator
  • Each section can be triggered independently
  • Retriggerable mode allows for extending the output pulse width
  • Wide range of trigger pulse widths and output pulse durations

Advantages and Disadvantages

Advantages: - High-speed operation enables accurate timing applications - Low power consumption makes it suitable for battery-powered devices - Wide operating voltage range provides flexibility in various circuits

Disadvantages: - Limited number of pins restricts the complexity of circuits that can be built using this IC - Not suitable for applications requiring precise timing over long periods

Working Principles

The 74HC4538D operates as a retriggerable monostable multivibrator. When triggered, it generates a single output pulse with a duration determined by external resistors and capacitors. The output pulse width can be extended by applying additional trigger pulses before the pulse ends.

Detailed Application Field Plans

The 74HC4538D finds applications in various fields, including:

  1. Timing circuits in electronic appliances
  2. Pulse generation for digital systems
  3. Frequency division in clock circuits
  4. Delay circuits in communication systems
  5. Control signal generation in industrial automation

Alternative Models

Other alternative models that provide similar functionality to the 74HC4538D include:

  1. CD4538: CMOS dual precision monostable multivibrator
  2. NE555: Timer IC with adjustable pulse width
  3. MC14538: Dual retriggerable precision monostable multivibrator

These alternative models can be used depending on specific requirements and availability.

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技術ソリューションにおける 74HC4538D の適用に関連する 10 件の一般的な質問と回答をリストします。

Sure! Here are 10 common questions and answers related to the application of 74HC4538D in technical solutions:

  1. Q: What is the 74HC4538D? A: The 74HC4538D is a dual retriggerable precision monostable multivibrator IC, commonly used in timing applications.

  2. Q: What is the purpose of the 74HC4538D? A: The 74HC4538D is used to generate precise time delays or pulses in electronic circuits.

  3. Q: How many monostable multivibrators are there in the 74HC4538D? A: The 74HC4538D contains two independent monostable multivibrators.

  4. Q: What is the maximum operating frequency of the 74HC4538D? A: The maximum operating frequency of the 74HC4538D is typically around 100 MHz.

  5. Q: How do I trigger the monostable multivibrator in the 74HC4538D? A: The monostable multivibrator can be triggered by applying a positive pulse to the trigger input (pin 2).

  6. Q: How do I set the desired time delay using the 74HC4538D? A: The time delay can be set by connecting appropriate resistors and capacitors to the timing components (pins 9, 10, 11, and 12).

  7. Q: Can I retrigger the monostable multivibrator before the time delay expires? A: Yes, the 74HC4538D is retriggerable, meaning that if a new trigger pulse is applied before the time delay expires, the output will be extended.

  8. Q: What is the output of the 74HC4538D during the time delay? A: The output of the 74HC4538D is high (logic level "1") during the time delay and then returns to low (logic level "0") after the delay expires.

  9. Q: Can I cascade multiple 74HC4538D ICs to achieve longer time delays? A: Yes, you can cascade multiple 74HC4538D ICs by connecting the output of one IC to the trigger input of another to achieve longer time delays.

  10. Q: What are some common applications of the 74HC4538D? A: The 74HC4538D is commonly used in applications such as timing circuits, pulse generation, frequency division, and precision timing control in various electronic systems.

Please note that these answers are general and may vary depending on specific circuit configurations and requirements.