Overview
The 74HCT138DB,118 is a 3-to-8 line decoder/demultiplexer produced by Nexperia USA Inc. This device is part of the 74HCT series, which is known for its high-speed CMOS technology and compatibility with TTL (Transistor-Transistor Logic) input levels. The 74HCT138 decodes three binary weighted address inputs (A0, A1, and A2) to eight mutually exclusive outputs (Y0 to Y7), making it ideal for various digital logic applications.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Supply Voltage Range | Operating voltage range | 2.0 V to 6.0 V |
| Input Voltage Range | Maximum input voltage | -0.5 V to 7.0 V |
| Output Voltage Range | Maximum output voltage | -0.3 V to VCC |
| Enable Inputs | Number and type of enable inputs | Two active LOW (E1, E2) and one active HIGH (E3) |
| ESD Protection | Human Body Model (HBM) and Charged Device Model (CDM) | HBM: 2000 V, CDM: 1000 V |
| Operating Temperature Range | Temperature range for operation | -40 °C to +125 °C |
| Package Type | Physical package of the IC | SSOP-16 (SOT403-1) |
Key Features
- Wide Supply Voltage Range: Operates from 2.0 V to 6.0 V, making it versatile for various applications.
- CMOS Low Power Dissipation: Low power consumption, which is beneficial for energy-efficient designs.
- High Noise Immunity: Ensures reliable operation in noisy environments.
- Multiple Enable Inputs: Allows for easy parallel expansion to create higher-order decoders (e.g., 4-to-16 or 5-to-32 lines) with minimal additional components.
- Demultiplexing Capability: Can be used as an eight-output demultiplexer by utilizing one of the active LOW enable inputs as the data input and the remaining enable inputs as strobes.
- Active LOW Mutually Exclusive Outputs: Ensures that only one output is active at a time, reducing the complexity of downstream logic.
- Input Levels: Compatible with TTL input levels, making it easy to integrate with other TTL-based systems.
- ESD Protection: Provides robust protection against electrostatic discharge, exceeding 2000 V for HBM and 1000 V for CDM.
Applications
- Memory Chip Select Decoding: Ideal for selecting memory chips in digital systems.
- Digital Logic Circuits: Used in various digital logic applications where decoding or demultiplexing is required.
- Automotive Electronics: Suitable for use in automotive systems due to its robust ESD protection and wide operating temperature range.
- Industrial Control Systems: Can be used in industrial control systems where reliability and noise immunity are crucial.
- Consumer Electronics: Found in consumer electronics for decoding and demultiplexing functions.
Q & A
- What is the primary function of the 74HCT138DB,118?
The primary function is to decode three binary weighted address inputs to eight mutually exclusive outputs, and it can also be used as a demultiplexer.
- What is the supply voltage range for the 74HCT138DB,118?
The supply voltage range is from 2.0 V to 6.0 V.
- How many enable inputs does the 74HCT138DB,118 have?
It has two active LOW enable inputs (E1, E2) and one active HIGH enable input (E3).
- What is the operating temperature range for the 74HCT138DB,118?
The operating temperature range is from -40 °C to +125 °C.
- What type of ESD protection does the 74HCT138DB,118 offer?
It offers ESD protection exceeding 2000 V for Human Body Model (HBM) and 1000 V for Charged Device Model (CDM).
- Can the 74HCT138DB,118 be used as a demultiplexer?
- What package type is the 74HCT138DB,118 available in?
- Is the 74HCT138DB,118 compatible with TTL input levels?
- How can the 74HCT138DB,118 be expanded for higher-order decoding?
- What are some common applications of the 74HCT138DB,118?
