MM74HCT138N

Product Overview

• Category: Integrated Circuit (IC)
• Use: Decoder/Demultiplexer
• Characteristics: High-Speed CMOS Logic, 3-to-8 Line Decoder
• Package: DIP (Dual In-line Package)
• Essence: Converts a binary input into a corresponding output line
• Packaging/Quantity: Available in tubes of 25 units or reels of 2,000 units

Specifications

• Supply Voltage Range: 4.5V to 5.5V
• Input Voltage Range: 0V to VCC
• Output Voltage Range: 0V to VCC
• Maximum Operating Frequency: 25 MHz
• Number of Inputs: 3
• Number of Outputs: 8
• Propagation Delay Time: 15 ns (typical)

Detailed Pin Configuration

The MM74HCT138N has a total of 16 pins, which are assigned as follows:

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

Functional Features

• Converts a 3-bit binary input into one of the eight corresponding output lines
• Enables easy selection of specific output lines based on the input combination
• High-speed operation allows for efficient decoding in various applications
• CMOS logic ensures low power consumption and compatibility with TTL inputs

Advantages and Disadvantages

Advantages: - Compact and versatile decoder/demultiplexer IC - High-speed operation for efficient decoding - Low power consumption due to CMOS technology - Easy selection of specific output lines based on input combination

Disadvantages: - Limited to 3-bit binary input, restricting the number of possible combinations - Propagation delay may affect timing-sensitive applications

Working Principles

The MM74HCT138N operates by receiving a 3-bit binary input (A0, A1, A2) and converting it into one of the eight corresponding output lines (Y0-Y7). The enable inputs (E1 and E2) control the functionality of the decoder. When both enable inputs are active (low), the decoder is enabled, and the selected output line reflects the binary input combination.

Detailed Application Field Plans

The MM74HCT138N finds applications in various fields, including:

1. Address Decoding: Used in microcontrollers and memory systems to select specific addresses.
2. Data Demultiplexing: Enables the distribution of data from a single source to multiple destinations.
3. Digital Displays: Controls the activation of specific segments in multiplexed displays.
4. Programmable Logic Controllers (PLCs): Facilitates input/output selection and control signal routing.

Detailed and Complete Alternative Models

1. 74HC138: Similar 3-to-8 line decoder/demultiplexer IC with slightly different electrical characteristics.
2. CD74HCT138: Another 3-to-8 line decoder/demultiplexer IC with similar functionality but different package options.
3. SN74HCT138: Texas Instruments' version of the 3-to-8 line decoder/demultiplexer IC.

(Note: This list is not exhaustive and other alternative models may exist.)

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