SN74LVC138ARGYR

Product Overview

• Category: Integrated Circuit
• Use: Decoder/Demultiplexer
• Characteristics:
  • Low-voltage CMOS technology
  • High-speed operation
  • Low power consumption
• Package: VQFN-16
• 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
• Propagation Delay Time: 4.2 ns (typical)
• Output Current: ±24 mA
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The SN74LVC138ARGYR has a total of 16 pins, which are assigned as follows:

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

Functional Features

The SN74LVC138ARGYR is a 3-to-8 line decoder/demultiplexer that converts a 3-bit binary address input into one of eight possible outputs. It utilizes low-voltage CMOS technology, allowing for high-speed operation while consuming minimal power.

The device features two enable inputs (/E1 and /E2) which control the operation of the decoder. When either enable input is low, the corresponding output is active, and all other outputs are in a high-impedance state. The active-low enable inputs provide flexibility in controlling the decoder's functionality.

Advantages and Disadvantages

Advantages: - Low-voltage operation allows for compatibility with a wide range of systems - High-speed operation enables efficient data processing - Low power consumption reduces energy requirements - Compact VQFN-16 package offers space-saving benefits

Disadvantages: - Limited to 3-bit address decoding, not suitable for applications requiring higher bit counts - Output current limitations may restrict use in certain high-current applications

Working Principles

The SN74LVC138ARGYR operates based on the principle of address decoding. The three address inputs (A0, A1, and A2) determine which output line will be active based on the binary value applied to these inputs. The enable inputs (/E1 and /E2) control the overall operation of the decoder, enabling or disabling specific output lines.

When an enable input is low, the corresponding output line becomes active, while all other output lines remain in a high-impedance state. This allows the decoder to selectively route signals based on the applied address, facilitating various demultiplexing and decoding applications.

Detailed Application Field Plans

The SN74LVC138ARGYR finds applications in various fields, including:

1. Address decoding in microcontrollers and microprocessors
2. Memory selection and expansion in computer systems
3. Data routing and signal demultiplexing in communication systems
4. Control signal generation in industrial automation
5. Address decoding in memory modules and storage devices

Detailed and Complete Alternative Models

1. SN74LVC138APWR: TSSOP-16 package, same functionality as SN74LVC138ARGYR
2. CD74HC138E: DIP-16 package, similar functionality but operates at higher voltage levels
3. 74HC138N: DIP-16 package, compatible with TTL logic levels, suitable for retro-computing projects

These alternative models offer similar or comparable functionality to the SN74LVC138ARGYR, providing options based on package preferences, voltage requirements, and specific project needs.

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