SN74AHCT138DR

Product Overview

• Category: Integrated Circuit (IC)
• Use: Decoder/Demultiplexer
• Characteristics: High-Speed, CMOS Logic, 3-to-8 Line Decoder/Demultiplexer
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: The SN74AHCT138DR is a decoder/demultiplexer IC that converts a binary input into a corresponding output line. It is commonly used in digital electronics for address decoding, data routing, and signal demultiplexing applications.
• Packaging/Quantity: The SN74AHCT138DR is available in a reel packaging with 2500 units per reel.

Specifications

• Supply Voltage: 2V to 5.5V
• Input Voltage: 0V to VCC
• Output Voltage: 0V to VCC
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay: 7 ns (typical)
• Number of Inputs: 3
• Number of Outputs: 8

Pin Configuration

The SN74AHCT138DR has a total of 16 pins arranged as follows:

+---+--+---+ A2 |1 +--+ 16| VCC A1 |2 | Y0 A0 |3 | Y1 /E1 |4 | Y2 /E2 |5 74 | Y3 /E3 |6 AHCT | Y4 GND |7 138 | Y5 Y7 |8 DR | Y6 Y6 |9 | G1 Y5 |10 | G2A Y4 |11 | G2B Y3 |12 | /E Y2 |13 | A Y1 |14 | B Y0 |15 | C +----------+

Functional Features

• Converts a 3-bit binary input to one of the eight output lines.
• Enables easy address decoding and signal routing in digital circuits.
• High-speed operation suitable for time-critical applications.
• CMOS logic ensures low power consumption and compatibility with a wide range of devices.

Advantages and Disadvantages

Advantages: - Fast propagation delay allows for efficient data processing. - Low power consumption makes it suitable for battery-powered devices. - Wide operating voltage range provides flexibility in various applications. - Compact SOIC package saves board space.

Disadvantages: - Limited number of inputs and outputs restricts its use in complex systems. - Not suitable for high-voltage applications due to its limited supply voltage range.

Working Principles

The SN74AHCT138DR operates based on the principle of binary decoding. The three input pins (A0, A1, A2) accept a 3-bit binary code, which is then decoded into one of the eight output lines (Y0-Y7). The enable pins (/E1, /E2, /E3) control the operation of the decoder/demultiplexer. When enabled, the selected output line becomes active, while all other output lines remain inactive.

Detailed Application Field Plans

The SN74AHCT138DR finds extensive use in various digital electronics applications, including:

1. Address Decoding: It is commonly used to decode memory addresses in microcontrollers and microprocessors.
2. Data Routing: The decoder/demultiplexer facilitates the selection and routing of data signals in multiplexed systems.
3. Signal Demultiplexing: It can be used to split a single input signal into multiple output signals, enabling efficient data distribution.

Detailed and Complete Alternative Models

1. 74HC138: Similar decoder/demultiplexer IC with slightly different characteristics and pin configuration.
2. CD74HCT138E: Another alternative with similar functionality but a different package type (DIP).

These alternative models can be considered based on specific project requirements and availability.

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