SN74LVC138ADR

Product Overview

• Category: Integrated Circuit (IC)
• Use: Decoder/Demultiplexer
• Characteristics: Low-voltage, CMOS technology
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: 3-to-8 line decoder/demultiplexer
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage Range: 1.65V to 5.5V
• Input Voltage Range: 0V to VCC
• Output Voltage Range: 0V to VCC
• Maximum Operating Frequency: 100 MHz
• Number of Inputs: 3
• Number of Outputs: 8
• Propagation Delay: 4.2 ns (typical)

Detailed Pin Configuration

The SN74LVC138ADR has a total of 16 pins, which are assigned as follows:

• Pin 1: GND (Ground)
• Pin 2: A0 (Input A0)
• Pin 3: A1 (Input A1)
• Pin 4: A2 (Input A2)
• Pin 5: /G1 (Enable Input)
• Pin 6: Y0 (Output Y0)
• Pin 7: Y1 (Output Y1)
• Pin 8: Y2 (Output Y2)
• Pin 9: Y3 (Output Y3)
• Pin 10: Y4 (Output Y4)
• Pin 11: Y5 (Output Y5)
• Pin 12: Y6 (Output Y6)
• Pin 13: Y7 (Output Y7)
• Pin 14: /G2A (Enable Input)
• Pin 15: /G2B (Enable Input)
• Pin 16: VCC (Supply Voltage)

Functional Features

The SN74LVC138ADR is a 3-to-8 line decoder/demultiplexer IC. It takes three binary inputs (A0, A1, and A2) and generates eight outputs (Y0 to Y7). The /G1 input is used to enable or disable the decoder function. The /G2A and /G2B inputs are used to select one of the three enable inputs.

Advantages and Disadvantages

Advantages: - Low-voltage operation allows for compatibility with various systems - CMOS technology provides low power consumption - Compact SOIC package offers space-saving benefits - High-speed operation with a maximum frequency of 100 MHz

Disadvantages: - Limited number of inputs and outputs compared to more advanced decoder ICs - Propagation delay may affect timing-sensitive applications

Working Principles

The SN74LVC138ADR works by decoding the three binary inputs into eight possible combinations. Each combination activates a specific output line, which can be used to control various devices or signals. The enable inputs (/G1, /G2A, and /G2B) determine whether the decoder function is active or disabled.

Detailed Application Field Plans

The SN74LVC138ADR is commonly used in digital electronics applications where decoding and demultiplexing functions are required. Some specific application areas include:

1. Address Decoding: Used in microcontrollers and memory systems to decode address lines and select specific memory locations.
2. Data Routing: Enables selection of specific data paths in multiplexed systems, such as communication switches or data buses.
3. LED Display Control: Used to drive multiple LED segments in displays, allowing for individual control of each segment.
4. Signal Demultiplexing: Splits a single input signal into multiple outputs, useful in audio/video distribution systems.

Detailed and Complete Alternative Models

1. 74HC138: Similar 3-to-8 line decoder/demultiplexer IC, compatible with higher voltage levels (2V to 6V).
2. CD74HCT138E: 3-to-8 line decoder/demultiplexer IC with TTL-compatible inputs and higher operating temperature range.

These alternative models offer similar functionality to the SN74LVC138ADR but may have different voltage ranges, package types, or additional features.

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