74HC138N

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74HC138N

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Attribut Wert
Manufacturer HGSEMI
Package DIP-16

Übersicht

Description

The 74HC138N is a high-speed CMOS logic IC functioning as a 3-to-8 line decoder/demultiplexer. It is part of the 74HC series and operates with a supply voltage range from 2V to 6V. The device takes three binary select inputs (A, B, C) and decodes them into one of eight outputs (Y0 to Y7), which are active-low. This means that the selected output is driven low while the others remain high. The IC also features three enable inputs (G1, G2A, and G2B), where G1 is active-high and G2A, G2B are active-low, providing additional control over the output state.
The 74HC138N is used in applications requiring low-power operation and high noise immunity, such as data routing, demultiplexing addresses in memory circuits, or simplifying digital logic design. Its compact DIP (Dual In-line Package) format makes it easy to integrate into breadboards and other prototyping setups. The device is characterized by fast switching times and low power consumption, making it suitable for a wide range of digital applications.

Equivalent

Equivalent products for the 74HC138N chip, a 3-to-8 line decoder/demultiplexer, include:
1. 74LS138
2. 74HC138
3. CD74HCT138
4. SN74HC138N
5. MC74HC138N
These chips generally share similar functionality and pin configuration, making them interchangeable in most applications. Always verify the electrical characteristics and ensure compatibility with your specific requirements.

Features

The 74HC138N is a high-speed CMOS 3-to-8 line decoder/demultiplexer. Key features include:
1. High-Speed Operation: It operates at high speeds due to its CMOS technology, making it suitable for fast digital circuits.

2. Wide Supply Voltage Range: It supports a supply voltage range from 2V to 6V, providing flexibility for various applications.
3. 3-to-8 Line Decoder: It decodes three binary weighted address inputs (A0, A1, A2) into one of eight unique outputs.
4. Enable Inputs: It has three enable inputs (two active LOW and one active HIGH), allowing for multiple device expansion and cascading.
5. Low Power Consumption: The CMOS technology ensures low static power consumption.
6. TTL Compatibility: The device is compatible with TTL input levels, allowing for easy integration with TTL logic families.
7. Output Capability: It features high current output capability, suitable for driving LED indicators or other loads directly.
8. Pin Configuration: It comes in a standard dual in-line package (DIP) with 16 pins.
These attributes make the 74HC138N ideal for use in memory addressing, data demultiplexing, and other decoding applications.

Pinout

The 74HC138N is a high-speed CMOS device and a 3-to-8 line decoder/demultiplexer. It has a total of 16 pins. Here’s a brief overview of its pin configuration and functions:
1. Pins 1-3 (A, B, C): These are the address input pins used to select one of the eight outputs.
2. Pins 4, 5, 6 (G2A, G2B, G1): These are enable pins. G1 is an active high enable, while G2A and G2B are active low enables. All must be properly set for the outputs to be active.
3. Pins 7, 9-11, 13-15 (Y0-Y7): These are the active low output pins. Depending on the address inputs, one of these outputs will be driven low.
4. Pin 8 (GND): Ground pin.
5. Pin 16 (Vcc): Supply voltage pin.
The 74HC138N decodes a 3-bit binary input to one of eight outputs, with the selected output being active low, while the others remain high. This makes it useful in applications requiring binary decoding or demultiplexing.

Manufacturer

The 74HC138N is manufactured by Nexperia, a company that specializes in the production of discrete and power components, as well as logic devices. Nexperia was originally part of NXP Semiconductors but became an independent company in 2017. The company focuses on creating efficient semiconductor solutions for a wide range of applications, including automotive, computing, consumer electronics, and industrial sectors. Nexperia is known for its emphasis on efficiency and reliability in its product offerings.

Application

The 74HC138N is a high-speed CMOS 3-to-8 line decoder/demultiplexer. Its application areas include:
1. Address Decoding: It is often used in memory address decoding for microprocessors and microcontrollers.
2. Data Routing: Helps in routing data signals to different parts of a digital system.
3. Signal Demultiplexing: Decodes a binary address to select one of the multiple outputs.
4. LED Display Control: Drives LED displays by controlling which segment is active.
5. Microcontroller Systems: Assists in expanding I/O ports by decoding signals for various peripherals.
6. Digital Systems: Used in implementing memory systems and other logic functions.
These applications exploit its capability to decode binary inputs into activated outputs efficiently.

Package

The 74HC138N is a high-speed CMOS 3-to-8 line decoder/demultiplexer, commonly used in digital circuits. It is typically packaged in a 16-pin Dual In-line Package (DIP).

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