SN74AHCT138NSR

Product Overview

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

Specifications

• Logic Family: AHCT
• Number of Inputs: 3
• Number of Outputs: 8
• Supply Voltage Range: 2V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay Time: 6 ns (typical)
• Output Current: ±8 mA
• Input Capacitance: 3 pF (typical)

Detailed Pin Configuration

The SN74AHCT138NSR 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. E3 (Enable Input 3)
16. VCC (Supply Voltage)

Functional Features

The SN74AHCT138NSR 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 enable inputs (E1, E2, and E3) control the operation of the decoder/demultiplexer. When the enable inputs are active, the selected output line is activated based on the input combination.

Advantages and Disadvantages

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

Disadvantages: - Limited number of inputs and outputs - Not suitable for complex decoding applications

Working Principles

The SN74AHCT138NSR works on the principle of combinational logic. The three input lines (A0, A1, and A2) represent a binary code, which determines the active output line. The enable inputs (E1, E2, and E3) control the activation of the decoder/demultiplexer. When an enable input is low, the corresponding output line is disabled.

Detailed Application Field Plans

The SN74AHCT138NSR is commonly used in various digital systems and applications, including:

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

Detailed and Complete Alternative Models

1. 74HC138: Similar 3-to-8 line decoder/demultiplexer IC from NXP Semiconductors.
2. CD74HC138: Equivalent IC from Texas Instruments with similar functionality.
3. DM74LS138: Decoder/demultiplexer IC from Fairchild Semiconductor, compatible with TTL logic levels.

These alternative models provide similar functionality and can be used as substitutes for the SN74AHCT138NSR in various applications.

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