• 74HC138D SOIC-16
74HC138D SOIC-16

74HC138D

Product 74HC138D is a demultiplexer/decoder with 3 to 8 line capability and comes in a 16-pin plastic SOP packaging

Quantity Unit Price(USD) Ext. Price
5000 $0.054 $270.00
2500 $0.057 $142.50
150 $0.079 $11.85
50 $0.089 $4.45
5 $0.108 $0.54
500 $0.072 $36.00

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Overview of 74HC138D

The 74HC138D is a 3-to-8 line decoder/demultiplexer IC that is commonly used in digital electronics for address decoding applications. This IC takes a binary address input and selects one of the 8 output lines based on the input address, making it a critical component in microprocessor systems and memory addressing circuits.

Pinout

(Note: The pin configuration below is a general representation. Refer to the specific datasheet for precise details.)

  • GND: Ground pin
  • A0, A1, A2: Address input pins
  • E: Enable input
  • Y0-Y7: Output lines
  • NC: No connection

Circuit Diagram

Include a circuit diagram illustrating the connections and operation of the 74HC138D IC for a visual representation.

Key Features

  • 3-to-8 Line Decoder/Demultiplexer: The 74HC138D can decode 3 binary inputs into 8 output lines, providing versatile address decoding capabilities.
  • Low Power Consumption: With its CMOS technology, this IC consumes minimal power, suitable for low-power applications.
  • Wide Operating Voltage Range: Operates with a supply voltage from 2V to 6V, offering compatibility with a range of digital systems.
  • High-Speed Operation: The 74HC138D offers fast response times, making it suitable for time-critical applications.
  • Multiple Output Selection: Allows for the selection of one of the 8 output lines based on the address input, enabling efficient data routing.

Note: For detailed technical specifications, please refer to the 74HC138D datasheet.

Application

  • Address Decoding: Ideal for use in address decoding circuits in microprocessor systems and memory access control.
  • Signal Routing: Suitable for routing data signals based on specific address inputs in digital systems.
  • Data Demultiplexing: Used for demultiplexing data from a single input to multiple outputs based on address selection.

Functionality

The 74HC138D acts as a decoder/demultiplexer, taking 3 address inputs and selecting one of the 8 output lines based on the address input combination. It enables efficient data routing and address decoding in digital circuits.

Usage Guide

  • Address Inputs: Connect the address input pins (A0, A1, A2) to the binary address for selecting the desired output line.
  • Enable Pin: Use the E pin to enable or disable the decoder/demultiplexer functionality.
  • Output Connection: Connect the selected output line (Y0-Y7) to the corresponding input of the next stage in the circuit.

Frequently Asked Questions

Q: What is the purpose of the enable pin (E) in the 74HC138D?
A: The enable pin is used to activate or deactivate the decoding functionality of the IC. When the enable pin is high, the decoder is enabled and functions according to the address inputs.

Q: Can the 74HC138D be cascaded for higher address decoding capabilities?
A: Yes, multiple 74HC138D ICs can be cascaded to increase the address decoding range in complex digital systems.

Equivalent

For similar functionalities, consider these alternatives to the 74HC138D:

  • 74LS138: This is a low-power Schottky version of the 3-to-8 line decoder/demultiplexer, offering similar functionality with different technology characteristics.
  • CD74HC238: A CMOS version of the 3-to-8 line decoder/demultiplexer, providing comparable performance to the 74HC138D.

74HC138D

Specifications

The followings are basic parameters of the part selected concerning the characteristics of the part and categories it belongs to.

Product Category Encoders, Decoders, Multiplexers & Demultiplexers Brand Nexperia
Product Type Encoders, Decoders, Multiplexers & Demultiplexers Subcategory Logic ICs

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