SN74LVC138ANSR

Product Overview

• Category: Integrated Circuit (IC)
• Use: Decoder/Demultiplexer
• Characteristics:
  • Low-voltage CMOS technology
  • High-speed operation
  • Low power consumption
  • Wide operating voltage range
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: Decodes a three-bit binary input to eight mutually exclusive outputs
• 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
• Propagation Delay Time: 3.8 ns (typical)
• Maximum Quiescent Current: 10 µA
• Maximum Output Current: ±24 mA

Detailed Pin Configuration

The SN74LVC138ANSR has a total of 16 pins, which are assigned as follows:

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

Functional Features

The SN74LVC138ANSR is a decoder/demultiplexer IC that takes a three-bit binary input and generates eight mutually exclusive outputs. It utilizes low-voltage CMOS technology, allowing for high-speed operation while consuming minimal power. The wide operating voltage range makes it suitable for various applications.

Advantages and Disadvantages

Advantages: - High-speed operation - Low power consumption - Wide operating voltage range - Compact SOIC package

Disadvantages: - Limited to three-bit decoding capability - Not suitable for complex decoding requirements

Working Principles

The SN74LVC138ANSR works by decoding the three-bit binary input (A0, A1, A2) and enabling one of the eight output lines (Y0-Y7) based on the input combination. The /G1, /G2A, and /G2B enable inputs control the operation of the decoder/demultiplexer.

Detailed Application Field Plans

The SN74LVC138ANSR is commonly used in various digital systems where decoding and demultiplexing functions are required. Some application fields include:

1. Address decoding in microcontrollers and microprocessors
2. Memory selection in RAM and ROM systems
3. Data routing in multiplexed data buses
4. Signal decoding in communication systems
5. Control signal generation in industrial automation

Detailed and Complete Alternative Models

1. 74HC138: Similar functionality, but operates at higher voltages (2V to 6V)
2. CD74HCT138: Compatible with TTL logic levels, operates at higher voltages (4.5V to 5.5V)
3. SN54LS138: Operates at higher voltages (4.75V to 5.25V), slower speed compared to LVC series

These alternative models provide similar decoding and demultiplexing capabilities, but with slight variations in voltage range and performance characteristics.

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