Encyclopedia Entry: 74AHCT138PW,118

Product Overview

Category

The 74AHCT138PW,118 belongs to the category of integrated circuits (ICs).

Use

This product is commonly used in electronic devices for signal decoding and multiplexing applications.

Characteristics

• High-speed operation
• Low power consumption
• Wide operating voltage range
• Compatibility with TTL input levels
• Schmitt-trigger action on all inputs

Package

The 74AHCT138PW,118 is available in a small outline package (SOT109-1) with 16 pins.

Essence

The essence of this product lies in its ability to efficiently decode and select one out of eight possible outputs based on the input signals.

Packaging/Quantity

The 74AHCT138PW,118 is typically packaged in reels or tubes, with a quantity of 2500 units per reel/tube.

Specifications

• Supply Voltage Range: 4.5V to 5.5V
• Input Voltage Range: 0V to VCC
• Output Voltage Range: 0V to VCC
• Operating Temperature Range: -40°C to +125°C
• Propagation Delay Time: 8 ns (max)
• Output Current: ±25 mA

Detailed Pin Configuration

The 74AHCT138PW,118 has 16 pins, which are labeled 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 74AHCT138PW,118 is designed to decode a three-bit binary code and select one of the eight outputs based on the input combination. It features three enable inputs (/G1, /G2A, /G2B) that control the operation of the decoder.

Advantages and Disadvantages

Advantages

• High-speed operation allows for quick signal decoding.
• Low power consumption makes it suitable for battery-powered devices.
• Wide operating voltage range provides flexibility in various applications.
• Compatibility with TTL input levels ensures compatibility with existing systems.
• Schmitt-trigger action on all inputs enhances noise immunity.

Disadvantages

• Limited to three-bit binary decoding, which may not be sufficient for complex applications requiring higher bit counts.
• May require additional external components for certain applications, such as pull-up resistors or decoupling capacitors.

Working Principles

The 74AHCT138PW,118 operates by receiving a three-bit binary code through the A0, A1, and A2 inputs. The enable inputs (/G1, /G2A, /G2B) control the output selection process. Based on the input combination, one of the eight outputs (Y0-Y7) is activated while the others remain inactive.

Detailed Application Field Plans

The 74AHCT138PW,118 finds application in various fields, including but not limited to: - Digital electronics - Microcontroller-based systems - Communication devices - Industrial automation - Consumer electronics

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to the 74AHCT138PW,118 include: - 74LS138 - CD74HC138 - SN74LVC138A

These models can be considered as alternatives based on specific requirements and compatibility with existing systems.

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