Texas Instruments
Obrázek může být reprezentace.
Viz Specifikace pro podrobnosti o produktu.
SN74LS138DRG4
Zobrazit detail DataSheets

SN74LS138DRG4

Product Overview

Category

SN74LS138DRG4 belongs to the category of integrated circuits (ICs).

Use

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

Characteristics

  • Low-power Schottky (LS) technology
  • 3-to-8 line decoder/demultiplexer
  • Active low outputs
  • High fan-out capability
  • Wide operating temperature range

Package

SN74LS138DRG4 is available in a small-outline package (SOIC) with 16 pins.

Essence

The essence of SN74LS138DRG4 lies in its ability to decode a three-bit binary input and activate one of the eight output lines based on the input combination.

Packaging/Quantity

SN74LS138DRG4 is typically sold in reels or tubes, containing a quantity of 250 or 2000 units respectively.

Specifications

  • Supply voltage: 4.75V to 5.25V
  • Input voltage: 2V to 5.5V
  • Output current: ±8mA
  • Operating temperature range: -40°C to 85°C
  • Propagation delay time: 15ns (max)
  • Power dissipation: 50mW (max)

Detailed Pin Configuration

  1. G1 (Enable Input 1)
  2. G2A (Enable Input 2)
  3. G2B (Enable Input 3)
  4. A (Input A)
  5. B (Input B)
  6. C (Input C)
  7. Y0 (Output 0)
  8. Y1 (Output 1)
  9. Y2 (Output 2)
  10. Y3 (Output 3)
  11. Y4 (Output 4)
  12. Y5 (Output 5)
  13. Y6 (Output 6)
  14. Y7 (Output 7)
  15. VCC (Supply Voltage)
  16. GND (Ground)

Functional Features

  • Decodes a three-bit binary input into eight mutually exclusive outputs
  • Active low outputs allow easy interfacing with other digital components
  • High fan-out capability enables driving multiple loads
  • Wide operating temperature range makes it suitable for various environments

Advantages and Disadvantages

Advantages

  • Low-power consumption due to LS technology
  • Compact SOIC package saves board space
  • Easy integration into digital systems
  • Reliable performance over a wide temperature range

Disadvantages

  • Limited to decoding three-bit inputs
  • Active low outputs may require additional level shifting in certain applications

Working Principles

SN74LS138DRG4 operates based on the principle of combinational logic. It decodes the three-bit binary input by activating one of the eight output lines, depending on the input combination. The active low outputs provide a logical high signal when not selected.

Detailed Application Field Plans

SN74LS138DRG4 finds applications in various digital systems, including but not limited to: - Address decoding in microprocessors - Memory selection in RAM modules - Data routing in multiplexers - Control signal generation in digital circuits

Detailed and Complete Alternative Models

Some alternative models that can be considered as alternatives to SN74LS138DRG4 are: - 74HC138: A CMOS version with similar functionality - CD74HCT138: A high-speed TTL version - DM74LS138: Another LS technology-based decoder/demultiplexer

These alternative models offer similar features and can be used interchangeably based on specific requirements.

Word count: 411

Seznam 10 běžných otázek a odpovědí souvisejících s aplikací SN74LS138DRG4 v technických řešeních

Sure! Here are 10 common questions and answers related to the application of SN74LS138DRG4:

  1. Q: What is SN74LS138DRG4? A: SN74LS138DRG4 is a 3-to-8 line decoder/demultiplexer integrated circuit (IC) commonly used in digital electronics.

  2. Q: What is the purpose of SN74LS138DRG4? A: The purpose of SN74LS138DRG4 is to decode binary information from one of eight inputs and activate the corresponding output line.

  3. Q: How does SN74LS138DRG4 work? A: SN74LS138DRG4 works by using three input lines (A, B, and C) to select one of eight outputs (Y0-Y7) based on the binary code applied to the inputs.

  4. Q: What is the maximum operating voltage for SN74LS138DRG4? A: The maximum operating voltage for SN74LS138DRG4 is typically 5.25V.

  5. Q: Can SN74LS138DRG4 be used with both TTL and CMOS logic levels? A: Yes, SN74LS138DRG4 is compatible with both TTL and CMOS logic levels.

  6. Q: What is the maximum output current of SN74LS138DRG4? A: The maximum output current of SN74LS138DRG4 is typically 8mA.

  7. Q: Can SN74LS138DRG4 be cascaded to increase the number of outputs? A: Yes, multiple SN74LS138DRG4 ICs can be cascaded together to increase the number of outputs.

  8. Q: Does SN74LS138DRG4 have any built-in protection features? A: SN74LS138DRG4 has built-in clamp diodes for protection against voltage spikes.

  9. Q: What is the typical propagation delay of SN74LS138DRG4? A: The typical propagation delay of SN74LS138DRG4 is around 15ns.

  10. Q: Can SN74LS138DRG4 be used in both synchronous and asynchronous applications? A: Yes, SN74LS138DRG4 can be used in both synchronous and asynchronous applications depending on the specific requirements.

Please note that the answers provided here are general and may vary based on specific datasheet specifications or application requirements.