SN74LVC138ADBR

Product Overview

• Category: Integrated Circuit (IC)
• Use: Decoder/Demultiplexer
• Characteristics: Low-voltage, CMOS logic, 3-to-8 line decoder/demultiplexer
• Package: SSOP (Shrink Small Outline Package)
• Essence: Converts a binary input into one of eight outputs based on the input code
• 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 Time: 4.2 ns (typical)

Detailed Pin Configuration

The SN74LVC138ADBR has a total of 16 pins. The pin configuration is as follows:

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

Functional Features

• Converts a 3-bit binary input into one of eight active-low outputs
• Enables cascading multiple decoders for larger decoding capabilities
• Low-voltage operation allows for compatibility with a wide range of systems
• CMOS logic ensures low power consumption and high noise immunity

Advantages and Disadvantages

Advantages: - Wide supply voltage range allows for versatile use in various applications - Low power consumption makes it suitable for battery-powered devices - High noise immunity ensures reliable operation in noisy environments - Compact SSOP package saves board space

Disadvantages: - Limited number of inputs and outputs restricts its application to smaller decoding tasks - Propagation delay time may affect timing-sensitive applications

Working Principles

The SN74LVC138ADBR is a 3-to-8 line decoder/demultiplexer. It takes a 3-bit binary input (A0, A1, A2) and activates one of the eight outputs (Y0-Y7) based on the input code. The enable inputs (E1, E2) control the operation of the decoder. When both enable inputs are high, the decoder is enabled, and the selected output is determined by the input code.

Detailed Application Field Plans

The SN74LVC138ADBR can be used in various applications, including:

1. Address Decoding: Used in microcontrollers and memory systems to decode address lines and select specific memory locations.
2. Data Routing: Enables data selection and routing in multiplexing applications, such as data buses and communication systems.
3. Display Control: Controls the activation of different segments or digits in LED displays or LCD panels.
4. Signal Demultiplexing: Splits a single input signal into multiple outputs, allowing for signal distribution in communication systems.

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to the SN74LVC138ADBR include:

1. CD74HC238E: High-speed CMOS 3-to-8 line decoder/demultiplexer with TTL-compatible inputs.
2. 74HC138N: Standard CMOS 3-to-8 line decoder/demultiplexer with a wide supply voltage range.
3. CD4017BE: Decade counter/divider with 10 decoded outputs, suitable for applications requiring sequential decoding.

These alternative models can be considered based on specific requirements and compatibility with the target system.

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