MC74LCX138MEL

Product Overview

• Category: Integrated Circuit (IC)
• Use: Decoding and demultiplexing
• Characteristics: Low voltage, high-speed operation
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: 3-to-8 line decoder/demultiplexer
• Packaging/Quantity: Tape and reel, 2500 pieces per reel

Specifications

• Supply Voltage Range: 2.0V to 3.6V
• High-Level Input Voltage: 2.0V to VCC
• Low-Level Input Voltage: GND to 0.8V
• High-Level Output Voltage: VCC - 0.5V
• Low-Level Output Voltage: 0.5V
• Maximum Quiescent Supply Current: 10µA at 3.6V
• Maximum Dynamic Supply Current: 100µA at 3.6V
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The MC74LCX138MEL has a total of 16 pins:

1. A0: Address input 0
2. A1: Address input 1
3. A2: Address input 2
4. E1: Enable input 1
5. E2: Enable input 2
6. E3: Enable input 3
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. GND: Ground
16. VCC: Power supply

Functional Features

The MC74LCX138MEL is a 3-to-8 line decoder/demultiplexer designed for low voltage applications. It accepts three address inputs (A0, A1, and A2) and three enable inputs (E1, E2, and E3). Based on the combination of these inputs, the IC decodes the address and activates the corresponding output line.

Advantages and Disadvantages

Advantages: - Low voltage operation allows for compatibility with modern electronic systems. - High-speed operation enables efficient decoding and demultiplexing. - Small package size (SOIC) makes it suitable for space-constrained applications.

Disadvantages: - Limited to 3-to-8 line decoding, may not be suitable for more complex applications. - Requires external components for proper functionality.

Working Principles

The MC74LCX138MEL works by using the address inputs to select one of the eight output lines. The enable inputs are used to activate or disable the decoder/demultiplexer. When the appropriate address and enable inputs are provided, the corresponding output line becomes active, allowing data to be routed to the desired destination.

Detailed Application Field Plans

The MC74LCX138MEL finds applications in various fields, including:

1. Digital electronics: Used for address decoding in microcontrollers, memory systems, and communication devices.
2. Data multiplexing: Enables efficient routing of data signals in telecommunications and networking equipment.
3. Industrial automation: Facilitates control signal distribution in PLCs (Programmable Logic Controllers) and industrial control systems.

Detailed and Complete Alternative Models

1. SN74LS138: Similar 3-to-8 line decoder/demultiplexer from Texas Instruments.
2. CD74HC238: High-speed CMOS 3-to-8 line decoder/demultiplexer from Texas Instruments.
3. 74HCT138: 3-to-8 line decoder/demultiplexer with TTL compatibility from NXP Semiconductors.

(Note: This is not an exhaustive list, and there are several other alternative models available in the market.)

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