SN74LVC138AQDREP

Product Overview

• Category: Integrated Circuit
• Use: Decoder/Demultiplexer
• Characteristics:
  • Low-voltage CMOS technology
  • High-speed operation
  • Wide operating voltage range
  • Multiple package options available
• Package: QFN (Quad Flat No-Lead)
• Essence: Decodes binary information to control multiple output lines
• 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
• Operating Temperature Range: -40°C to +85°C
• Maximum Propagation Delay: 6 ns
• Maximum Quiescent Current: 2 μA

Detailed Pin Configuration

The SN74LVC138AQDREP has a total of 16 pins. The pin configuration is as follows:

1. GND (Ground)
2. A0 (Address Input 0)
3. A1 (Address Input 1)
4. A2 (Address Input 2)
5. /G1 (Enable Input)
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. VCC (Supply Voltage)
15. /G2A (Enable Input)
16. /G2B (Enable Input)

Functional Features

The SN74LVC138AQDREP is a 3-to-8 line decoder/demultiplexer. It takes three address inputs (A0, A1, and A2) and one enable input (/G1) to decode the binary information and control eight output lines (Y0-Y7). The decoder/demultiplexer is designed using low-voltage CMOS technology, allowing for high-speed operation and a wide operating voltage range. It provides a reliable solution for various digital applications.

Advantages and Disadvantages

Advantages: - Low-voltage operation allows for compatibility with a wide range of systems - High-speed operation enables efficient data processing - Multiple package options provide flexibility in design and integration - Wide operating voltage range enhances versatility

Disadvantages: - Limited number of output lines compared to higher-order decoders - Propagation delay may affect real-time applications with strict timing requirements

Working Principles

The SN74LVC138AQDREP works based on the principle of binary decoding. The three address inputs (A0, A1, and A2) represent a binary code, which is decoded to activate one of the eight output lines (Y0-Y7). The enable input (/G1) controls the decoding process. When /G1 is low, the decoder is enabled, and the selected output line reflects the binary code applied to the address inputs. When /G1 is high, the decoder is disabled, and all output lines are in a high-impedance state.

Detailed Application Field Plans

The SN74LVC138AQDREP finds applications in various fields, including:

1. Microcontroller Systems: Used to expand the number of available I/O pins by decoding multiple addresses.
2. Memory Address Decoding: Enables selection of specific memory locations in systems with limited address lines.
3. Data Routing: Facilitates data routing in multiplexing applications, such as selecting different data sources for display or processing.
4. Digital Communication Systems: Used for address decoding in communication protocols, such as I2C or SPI.

Detailed and Complete Alternative Models

1. SN74LVC138APWR: TSSOP (Thin Shrink Small Outline Package) package variant.
2. SN74LVC138ADGVR: TVSOP (Thin Very Small Outline Package) package variant.
3. SN74LVC138ARGYR: VQFN (Very Thin Quad Flat No-Lead) package variant.

These alternative models offer similar functionality to the SN74LVC138AQDREP but come in different package options, providing flexibility in design and integration.

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