SN74HC138D

Product Overview

Category

SN74HC138D belongs to the category of integrated circuits (ICs).

Use

It is commonly used as a decoder/demultiplexer in various electronic applications.

Characteristics

• High-speed CMOS logic technology
• Low power consumption
• Wide operating voltage range
• 3-to-8 line decoding capability

Package

SN74HC138D is available in a standard 16-pin dual in-line package (DIP).

Essence

The essence of SN74HC138D lies in its ability to decode and demultiplex multiple input signals into separate output lines.

Packaging/Quantity

SN74HC138D is typically sold in reels or tubes, with each reel/tube containing a specific quantity of ICs. The exact packaging and quantity may vary depending on the supplier.

Specifications

• Supply Voltage: 2V to 6V
• Input Voltage: 0V to VCC
• Output Voltage: 0V to VCC
• Operating Temperature Range: -40°C to +85°C
• Maximum Propagation Delay: 25 ns
• Maximum Quiescent Current: 4 µA

Detailed Pin Configuration

1. GND (Ground)
2. A0 (Address Input 0)
3. A1 (Address Input 1)
4. A2 (Address Input 2)
5. E1 (Enable Input 1)
6. E2 (Enable Input 2)
7. E3 (Enable Input 3)
8. Y0 (Output 0)
9. Y1 (Output 1)
10. Y2 (Output 2)
11. Y3 (Output 3)
12. Y4 (Output 4)
13. Y5 (Output 5)
14. Y6 (Output 6)
15. Y7 (Output 7)
16. VCC (Supply Voltage)

Functional Features

• Decodes 3-bit binary inputs into 8 mutually exclusive outputs
• Enables cascading of multiple SN74HC138D ICs for larger decoding applications
• Provides active low outputs for easy interfacing with other logic devices
• High noise immunity due to Schmitt-trigger inputs

Advantages and Disadvantages

Advantages

• Fast and efficient decoding of multiple input signals
• Low power consumption
• Wide operating voltage range allows compatibility with various systems
• Easy integration with other logic devices
• High noise immunity ensures reliable operation in noisy environments

Disadvantages

• Limited number of output lines (8) may not be sufficient for certain complex applications
• Lack of built-in protection features against electrical faults

Working Principles

SN74HC138D operates based on the principle of binary decoding. The three address inputs (A0, A1, A2) accept a 3-bit binary code, which is then decoded to activate one of the eight output lines (Y0-Y7). The enable inputs (E1, E2, E3) control the functioning of the decoder/demultiplexer.

Detailed Application Field Plans

SN74HC138D finds extensive use in various electronic applications, including but not limited to: - Address decoding in microprocessors and microcontrollers - Memory selection in digital systems - Data routing in communication systems - Signal demultiplexing in multiplexed display units - Control signal generation in industrial automation

Detailed and Complete Alternative Models

Some alternative models that can be considered as alternatives to SN74HC138D are: - CD74HC138E by Texas Instruments - MC74HC138AN by ON Semiconductor - 74HC138D by NXP Semiconductors - DM74LS138N by Fairchild Semiconductor

These alternative models offer similar functionality and can be used as drop-in replacements for SN74HC138D in most applications.

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