Overview
The SN74HC138PWT, manufactured by Texas Instruments, is a high-performance 3-line to 8-line decoder/demultiplexer. This integrated circuit is designed to decode three binary weighted address inputs into eight mutually exclusive outputs. It is widely used in applications requiring high-speed decoding and demultiplexing, such as memory address decoding and data routing. The SN74HC138PWT is part of the HC logic family, known for its compatibility with CMOS and TTL logic levels, making it versatile for various digital systems. Its compact TSSOP-16 package and robust performance make it a preferred choice for space-constrained and high-reliability applications.
Key Specifications
| Parameter | Value | Unit | Notes |
|---|---|---|---|
| Logic Family | HC | - | Compatible with CMOS and TTL |
| Input Lines | 3 | - | Binary weighted address inputs |
| Output Lines | 8 | - | Mutually exclusive outputs |
| Supply Voltage | 2 to 6 | V | Wide operating range |
| Operating Temperature | -40 to +85 | °C | Industrial temperature range |
| Package | TSSOP-16 | - | Surface mount |
| Propagation Delay | 26 | ns | At 6V, 50pF |
| Output Current | ±5.2 | mA | High and low level |
| Power Dissipation | 320 | mW | Maximum |
| RoHS Compliance | Yes | - | Lead-free |
Key Features
- High-speed decoding and demultiplexing capabilities.
- Compatible with both CMOS and TTL logic levels.
- Wide operating voltage range (2V to 6V).
- Industrial temperature range (-40°C to +85°C).
- Compact TSSOP-16 package for space-constrained applications.
- Low power consumption with high noise immunity.
- Three enable inputs for easy expansion and control.
Applications
The SN74HC138PWT is extensively used in various digital systems, including memory address decoding, data routing, and signal demultiplexing. Its high-speed performance and compatibility with different logic levels make it ideal for applications in industrial automation, consumer electronics, and automotive systems. Specific use cases include microcontroller-based systems, communication devices, and embedded systems where efficient decoding and signal routing are critical.
Q & A
1. What is the operating voltage range of the SN74HC138PWT?
The SN74HC138PWT operates within a voltage range of 2V to 6V.
2. What is the maximum propagation delay of the SN74HC138PWT?
The maximum propagation delay is 26ns at 6V with a 50pF load.
3. Is the SN74HC138PWT compatible with TTL logic levels?
Yes, it is compatible with both CMOS and TTL logic levels.
4. What is the package type of the SN74HC138PWT?
It comes in a TSSOP-16 package.
5. Can the SN74HC138PWT be used in industrial applications?
Yes, it is designed to operate in an industrial temperature range of -40°C to +85°C.
6. How many enable inputs does the SN74HC138PWT have?
It has three enable inputs for easy control and expansion.
7. What is the output current capability of the SN74HC138PWT?
It can source or sink up to 5.2mA.
8. Is the SN74HC138PWT RoHS compliant?
Yes, it is RoHS compliant and lead-free.
9. What are the typical applications of the SN74HC138PWT?
Typical applications include memory address decoding, data routing, and signal demultiplexing.
10. What is the power dissipation of the SN74HC138PWT?
The maximum power dissipation is 320mW.
