Texas Instruments
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SN74AHC138PWRE4
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SN74AHC138PWRE4

Product Overview

  • Category: Integrated Circuit
  • Use: Decoder/Demultiplexer
  • Characteristics:
    • High-speed CMOS logic
    • Low power consumption
    • Wide operating voltage range
  • Package: TSSOP (Thin Shrink Small Outline Package)
  • Essence: 3-to-8 Line Decoder/Demultiplexer
  • Packaging/Quantity: Tape and Reel, 2500 pieces per reel

Specifications

  • Logic Family: AHC
  • Number of Inputs: 3
  • Number of Outputs: 8
  • Supply Voltage Range: 2V to 5.5V
  • Propagation Delay Time: 6 ns (typical)
  • Operating Temperature Range: -40°C to 85°C

Detailed Pin Configuration

The SN74AHC138PWRE4 has a total of 16 pins. The pin configuration is as follows:

  1. GND (Ground)
  2. A0 (Input A0)
  3. A1 (Input A1)
  4. A2 (Input A2)
  5. Y0 (Output Y0)
  6. Y1 (Output Y1)
  7. Y2 (Output Y2)
  8. Y3 (Output Y3)
  9. Y4 (Output Y4)
  10. Y5 (Output Y5)
  11. Y6 (Output Y6)
  12. Y7 (Output Y7)
  13. E1 (Enable Input 1)
  14. E2 (Enable Input 2)
  15. E3 (Enable Input 3)
  16. VCC (Supply Voltage)

Functional Features

The SN74AHC138PWRE4 is a 3-to-8 line decoder/demultiplexer that converts a 3-bit binary input into an output that selects one of the eight outputs. It is designed using high-speed CMOS logic, allowing for fast operation while consuming low power. The wide operating voltage range makes it suitable for various applications.

Advantages and Disadvantages

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

Disadvantages: - Limited number of inputs and outputs - Not suitable for complex decoding tasks

Working Principles

The SN74AHC138PWRE4 works by decoding the 3-bit binary input to select one of the eight outputs based on the input combination. The enable inputs (E1, E2, E3) control the output selection. When the enable inputs are active, the selected output becomes active, while all other outputs remain inactive. The decoder/demultiplexer operates with high speed and low power consumption, making it suitable for various digital applications.

Detailed Application Field Plans

The SN74AHC138PWRE4 can be used in a wide range of applications, including but not limited to:

  1. Address decoding in microcontrollers and microprocessors.
  2. Memory selection in RAM and ROM systems.
  3. Data routing and selection in multiplexers.
  4. Signal demultiplexing in communication systems.
  5. Control signal generation in digital circuits.

Detailed and Complete Alternative Models

  1. 74HC138: Similar functionality, but operates at a higher voltage range (2V to 6V).
  2. CD74HC138: Equivalent functionality from a different manufacturer (Texas Instruments).
  3. MC74HC138: Alternative version with slightly different pin configuration but similar functionality.

These alternative models provide similar decoding capabilities and can be used as substitutes for the SN74AHC138PWRE4 depending on specific requirements and availability.

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Liste 10 almindelige spørgsmål og svar relateret til anvendelsen af SN74AHC138PWRE4 i tekniske løsninger

Sure! Here are 10 common questions and answers related to the application of SN74AHC138PWRE4:

  1. Q: What is the SN74AHC138PWRE4? A: The SN74AHC138PWRE4 is a 3-to-8 line decoder/demultiplexer integrated circuit (IC) that can be used in various digital logic applications.

  2. Q: What is the operating voltage range for SN74AHC138PWRE4? A: The operating voltage range for SN74AHC138PWRE4 is typically between 2V and 5.5V.

  3. Q: What is the maximum output current of SN74AHC138PWRE4? A: The maximum output current of SN74AHC138PWRE4 is 8mA.

  4. Q: How many inputs does SN74AHC138PWRE4 have? A: SN74AHC138PWRE4 has three input pins, A0, A1, and A2, which are used to select one of the eight outputs.

  5. Q: Can SN74AHC138PWRE4 be used as a demultiplexer? A: Yes, SN74AHC138PWRE4 can be used as a demultiplexer by connecting its inputs to the appropriate control signals and using its outputs to route data to different destinations.

  6. Q: What is the purpose of the enable pin (E) in SN74AHC138PWRE4? A: The enable pin (E) is used to enable or disable the operation of the decoder. When E is high, the decoder is enabled, and when E is low, the decoder is disabled.

  7. Q: How many output pins does SN74AHC138PWRE4 have? A: SN74AHC138PWRE4 has eight output pins, Y0 to Y7, which correspond to the eight possible combinations of the input pins.

  8. Q: What is the propagation delay of SN74AHC138PWRE4? A: The propagation delay of SN74AHC138PWRE4 is typically around 6 ns.

  9. Q: Can SN74AHC138PWRE4 be cascaded to increase the number of outputs? A: Yes, multiple SN74AHC138PWRE4 ICs can be cascaded together to increase the number of outputs and decode larger address spaces.

  10. Q: What are some typical applications of SN74AHC138PWRE4? A: SN74AHC138PWRE4 is commonly used in microcontrollers, memory decoding, address decoding, data routing, and general-purpose digital logic circuits.

Please note that these answers are general and may vary depending on specific design considerations and requirements.