SN74HCT138PWRE4

Product Overview

• Category: Integrated Circuit (IC)
• Use: Decoder/Demultiplexer
• Characteristics: High-Speed CMOS Logic, 3-to-8 Line Decoder/Demultiplexer
• Package: TSSOP-16
• Essence: The SN74HCT138PWRE4 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 SN74HCT138PWRE4 is available in a TSSOP-16 package and is typically sold in reels of 2500 units.

Specifications

• Logic Family: HCT
• Number of Inputs: 3
• Number of Outputs: 8
• Supply Voltage Range: 4.5V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay: 13 ns (typical)
• Output Current: ±6 mA
• Input Capacitance: 3.5 pF (typical)

Pin Configuration

The SN74HCT138PWRE4 has a total of 16 pins arranged as follows:

+---+--+---+ A2 --|1 +--+ 16|-- VCC A1 --|2 15|-- Y7 A0 --|3 14|-- Y6 /G2 --|4 13|-- Y5 /G1 --|5 12|-- Y4 /G0 --|6 11|-- Y3 Y0 --|7 10|-- Y2 Y1 --|8 9|-- GND +----------+

Functional Features

• Converts a 3-bit binary input to one of the eight output lines.
• Enables easy address decoding and signal routing in digital systems.
• Low power consumption due to HCT logic family.
• High-speed operation with typical propagation delay of 13 ns.

Advantages and Disadvantages

Advantages

• Compact size and high integration.
• Wide supply voltage range allows compatibility with various systems.
• Fast switching speed for efficient data processing.
• Low power consumption for energy-efficient designs.

Disadvantages

• Limited number of inputs and outputs compared to more advanced decoder ICs.
• Not suitable for applications requiring higher decoding complexity.

Working Principles

The SN74HCT138PWRE4 operates based on the principle of combinational logic. It uses the three input lines (A0, A1, and A2) to select one of the eight output lines (Y0 to Y7). The selected output line is determined by the binary value applied to the input lines. When the enable input (/G2, /G1, /G0) is low, the decoder is active, and the selected output line is driven low while all other output lines remain high.

Detailed Application Field Plans

The SN74HCT138PWRE4 finds applications in various fields, including:

1. Microcontrollers: Used for address decoding to interface with external memory or peripheral devices.
2. Data Multiplexing: Enables routing of multiple data signals to different destinations based on control signals.
3. Digital Communication Systems: Facilitates signal demultiplexing and routing in communication protocols.
4. Programmable Logic Controllers (PLCs): Utilized for address decoding and signal routing in industrial automation systems.
5. Memory Modules: Enables selection of specific memory banks or modules based on address inputs.

Detailed and Complete Alternative Models

1. 74HC138: Similar functionality but operates at a higher voltage range (2V to 6V).
2. CD74HCT138E: DIP-16 package alternative with the same functionality.
3. SN74LS138N: TTL logic family alternative with similar functionality.

These alternative models provide similar decoding capabilities and can be used as replacements for the SN74HCT138PWRE4 in various applications.

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