Overview
The SN74F138NS is a 3-line to 8-line decoder/demultiplexer integrated circuit produced by Texas Instruments. This component is designed for high-performance memory-decoding and data-routing applications, particularly where very short propagation delay times are crucial. It is part of the 74F series, known for its high-speed capabilities and is suitable for use in high-speed memory systems to minimize system decoding delays.
Key Specifications
| Parameter | Value |
|---|---|
| Package Type | SOP (NS), 16 pins |
| Operating Temperature Range | 0°C to 70°C |
| Supply Voltage Range | –0.5 V to 7 V |
| Input Voltage Range | –1.2 V to 7 V |
| Input Current Range | –30 mA to 5 mA |
| Output Current in Low State | 40 mA |
| Storage Temperature Range | –65°C to 150°C |
Key Features
- Designed specifically for high-speed memory decoders and data transmission systems.
- Incorporates three enable inputs (two active-low and one active-high) to simplify cascading and/or data reception.
- Available in various package options including plastic small-outline packages, ceramic chip carriers, and standard plastic and ceramic 300-mil DIPs.
- Enable inputs can be used as data inputs for demultiplexing applications.
- Can implement 24-line and 32-line decoders with minimal external components.
Applications
The SN74F138NS is primarily used in high-performance memory systems, data-routing applications, and other scenarios where fast decoding and demultiplexing are required. It is particularly useful in minimizing system decoding delays when used with high-speed memories.
Q & A
- What is the primary function of the SN74F138NS?
The SN74F138NS functions as a 3-line to 8-line decoder/demultiplexer.
- What are the operating temperature ranges for the SN74F138NS?
The operating temperature range is from 0°C to 70°C.
- What are the package options available for the SN74F138NS?
It is available in plastic small-outline packages, ceramic chip carriers, and standard plastic and ceramic 300-mil DIPs.
- How can the enable inputs be used in the SN74F138NS?
The enable inputs can be used as data inputs for demultiplexing applications.
- Can the SN74F138NS be used to implement larger decoders?
Yes, it can implement 24-line and 32-line decoders with minimal external components.
- What is the maximum output current in the low state for the SN74F138NS?
The maximum output current in the low state is 40 mA.
- What is the storage temperature range for the SN74F138NS?
The storage temperature range is from –65°C to 150°C.
- Is the SN74F138NS RoHS compliant?
Yes, the SN74F138NS is RoHS compliant as defined by Texas Instruments.
- What are the typical applications of the SN74F138NS?
It is used in high-performance memory systems and data-routing applications.
- Can the SN74F138NS be used in military temperature ranges?
No, the SN74F138NS is characterized for operation from 0°C to 70°C, but the SN54F138 variant is characterized for the full military temperature range of –55°C to 125°C.
