STMicroelectronics
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M74HC138B1R
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M74HC138B1R

Product Overview

  • Category: Integrated Circuit
  • Use: Decoder/Demultiplexer
  • Characteristics: High-speed, CMOS technology
  • Package: SO-16
  • Essence: 3-to-8 line decoder/demultiplexer
  • Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

  • Supply Voltage: 2V to 6V
  • Input Voltage: -0.5V to VCC + 0.5V
  • Output Voltage: -0.5V to VCC + 0.5V
  • Operating Temperature: -40°C to 125°C
  • Propagation Delay Time: 13 ns (typical)
  • Output Current: ±25 mA

Detailed Pin Configuration

The M74HC138B1R has a total of 16 pins, which are assigned as follows:

  1. GND (Ground)
  2. A0 (Address Input 0)
  3. A1 (Address Input 1)
  4. A2 (Address Input 2)
  5. E1 (Enable Input 1)
  6. Y0 (Output 0)
  7. Y1 (Output 1)
  8. Y2 (Output 2)
  9. Y3 (Output 3)
  10. Y4 (Output 4)
  11. Y5 (Output 5)
  12. Y6 (Output 6)
  13. Y7 (Output 7)
  14. E2 (Enable Input 2)
  15. VCC (Positive Supply Voltage)
  16. NC (No Connection)

Functional Features

The M74HC138B1R is a high-speed CMOS decoder/demultiplexer integrated circuit. It takes a 3-bit binary input and generates eight mutually exclusive outputs. The enable inputs (E1 and E2) control the operation of the decoder/demultiplexer. When both enable inputs are high, all outputs are in a high-impedance state.

Advantages and Disadvantages

Advantages: - High-speed operation - Wide operating voltage range - Low power consumption - Compact SO-16 package

Disadvantages: - Limited number of input lines - Output current limitations

Working Principles

The M74HC138B1R uses CMOS technology to decode the binary input and generate the corresponding output signals. The enable inputs determine whether the decoder/demultiplexer is active or in a high-impedance state. The outputs are driven by internal logic gates, providing fast and reliable operation.

Detailed Application Field Plans

The M74HC138B1R can be used in various applications, including but not limited to:

  1. Address decoding in microcontrollers and microprocessors
  2. Memory selection in digital systems
  3. Data routing in communication systems
  4. Signal demultiplexing in multimedia devices
  5. Control signal generation in industrial automation

Detailed and Complete Alternative Models

  1. 74LS138: TTL version of the decoder/demultiplexer
  2. CD74HC138: Another CMOS version with similar specifications
  3. SN74LS138: Schottky-clamped TTL version for improved performance

These alternative models offer similar functionality and can be used as substitutes for the M74HC138B1R in various applications.

Word count: 315 words

רשום 10 שאלות ותשובות נפוצות הקשורות ליישום של M74HC138B1R בפתרונות טכניים

Sure! Here are 10 common questions and answers related to the application of M74HC138B1R in technical solutions:

Q1: What is the M74HC138B1R? A1: The M74HC138B1R is a 3-to-8 line decoder/demultiplexer integrated circuit (IC) that can be used in various digital logic applications.

Q2: What is the purpose of the M74HC138B1R? A2: The M74HC138B1R is used to decode binary information from a microcontroller or other digital source into multiple output lines, enabling the selection of one out of eight possible outputs.

Q3: What voltage levels does the M74HC138B1R support? A3: The M74HC138B1R supports a wide range of voltage levels, typically between 2V and 6V.

Q4: How many input lines does the M74HC138B1R have? A4: The M74HC138B1R has three input lines (A0, A1, and A2) which are used to select one of the eight output lines.

Q5: How many output lines does the M74HC138B1R have? A5: The M74HC138B1R has eight output lines (Y0-Y7) which can be individually selected based on the input signals.

Q6: Can the M74HC138B1R be cascaded to increase the number of output lines? A6: Yes, multiple M74HC138B1R ICs can be cascaded together to increase the number of output lines beyond eight.

Q7: What is the maximum current that each output of the M74HC138B1R can sink/source? A7: Each output of the M74HC138B1R can sink/source up to 25mA of current.

Q8: What is the power supply voltage range for the M74HC138B1R? A8: The M74HC138B1R operates within a power supply voltage range of 2V to 6V.

Q9: Can the M74HC138B1R be used in both TTL and CMOS logic systems? A9: Yes, the M74HC138B1R is compatible with both TTL and CMOS logic systems.

Q10: Are there any specific precautions to consider when using the M74HC138B1R? A10: It is important to ensure that the input signals provided to the M74HC138B1R are within the specified voltage levels. Additionally, proper decoupling capacitors should be used to stabilize the power supply.