ON Semiconductor
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DM74LS138N
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DM74LS138N

Product Overview

Category

DM74LS138N belongs to the category of integrated circuits (ICs).

Use

It is commonly used as a decoder/demultiplexer in digital electronic systems.

Characteristics

  • Low power consumption
  • High noise immunity
  • Wide operating voltage range
  • Fast propagation delay time

Package

DM74LS138N is available in a 16-pin DIP (Dual Inline Package) format.

Essence

The essence of DM74LS138N lies in its ability to decode binary information and select one output among multiple possibilities.

Packaging/Quantity

DM74LS138N is typically packaged in tubes or trays, with quantities varying depending on the supplier.

Specifications

  • Supply Voltage: 4.75V to 5.25V
  • Input Voltage: 0V to VCC
  • Output Voltage: 0V to VCC
  • Operating Temperature Range: -40°C to +85°C
  • Maximum Propagation Delay Time: 35ns

Detailed Pin Configuration

  1. G2A
  2. G2B
  3. G1
  4. GND
  5. Y0
  6. Y1
  7. Y2
  8. Y3
  9. Y4
  10. Y5
  11. Y6
  12. Y7
  13. E1
  14. E2
  15. VCC
  16. A0-A2

Functional Features

  • Decodes 3-bit binary inputs into 8 mutually exclusive outputs
  • Enables individual output selection using enable pins (E1 and E2)
  • Provides active low outputs for easy interfacing with other digital components

Advantages

  • Low power consumption makes it suitable for battery-powered devices
  • High noise immunity ensures reliable operation in noisy environments
  • Wide operating voltage range allows compatibility with various power supplies
  • Fast propagation delay time enables high-speed data processing

Disadvantages

  • Limited number of input combinations due to 3-bit decoding capability
  • Lack of built-in protection features against electrical faults

Working Principles

DM74LS138N operates based on the principle of binary decoding. It takes a 3-bit binary input and activates one of its eight outputs based on the input combination. The enable pins (E1 and E2) control the output selection process.

Detailed Application Field Plans

DM74LS138N finds applications in various digital systems, including but not limited to: - Address decoding in microprocessors and memory systems - Data demultiplexing in communication systems - Control signal generation in industrial automation - Input selection in multiplexers and data selectors

Detailed and Complete Alternative Models

Some alternative models to DM74LS138N that offer similar functionality include: - SN74LS138 - CD74HC138 - MC74HC138 - 74HCT138

These alternatives may have different characteristics, pin configurations, or package options, but they serve the same purpose as DM74LS138N.

Word count: 334 words

Перелічіть 10 типових запитань і відповідей, пов’язаних із застосуванням DM74LS138N у технічних рішеннях

Sure! Here are 10 common questions and answers related to the application of DM74LS138N in technical solutions:

  1. Q: What is DM74LS138N? A: DM74LS138N is a decoder/demultiplexer IC (integrated circuit) that can be used to decode binary information and select one of multiple outputs based on the input signals.

  2. Q: What is the purpose of using DM74LS138N in a technical solution? A: DM74LS138N is commonly used to simplify complex digital circuits by reducing the number of control lines required to select different outputs or devices.

  3. Q: How many inputs does DM74LS138N have? A: DM74LS138N has three enable inputs (G1, G2A, G2B) and three binary-coded address inputs (A0, A1, A2), allowing for up to 8 possible output selections.

  4. Q: What is the maximum output current of DM74LS138N? A: The maximum output current of DM74LS138N is typically around 8 mA per output pin.

  5. Q: Can DM74LS138N be used with both TTL and CMOS logic levels? A: Yes, DM74LS138N is compatible with both TTL (Transistor-Transistor Logic) and CMOS (Complementary Metal-Oxide-Semiconductor) logic levels.

  6. Q: How can I connect DM74LS138N to other components in a circuit? A: DM74LS138N can be connected to other components using standard digital logic techniques, such as connecting the enable inputs to appropriate control signals and the address inputs to binary-encoded signals.

  7. Q: Can DM74LS138N be cascaded to increase the number of output selections? A: Yes, multiple DM74LS138N ICs can be cascaded together to increase the number of output selections by connecting the enable inputs and address inputs in a series.

  8. Q: What is the power supply voltage range for DM74LS138N? A: The recommended power supply voltage range for DM74LS138N is typically between 4.75V and 5.25V.

  9. Q: Does DM74LS138N have any built-in protection features? A: No, DM74LS138N does not have built-in protection features. It is important to ensure that the input signals and power supply voltages are within the specified limits to prevent damage.

  10. Q: Are there any alternative ICs to DM74LS138N with similar functionality? A: Yes, there are other decoder/demultiplexer ICs available in the market, such as 74HC138, CD74HC138, or SN74LS138, which offer similar functionality to DM74LS138N.

Please note that these answers are general and may vary depending on the specific datasheet and manufacturer's specifications for DM74LS138N.