Overview
The SN74F138N is a 3-line to 8-line decoder/demultiplexer integrated circuit produced by Texas Instruments. This component is designed for high-performance memory-decoding or data-routing applications, particularly where very short propagation delay times are crucial. It is suitable for use in high-speed memory systems, where it can minimize the effects of system decoding and ensure that the effective system delay introduced by the decoder is negligible when used with fast enable circuits and high-speed memories.
Key Specifications
| Parameter | Value |
|---|---|
| Package | PDIP-16 |
| Pins | 16 |
| 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.
- Can be used as a data input for demultiplexing applications.
- Allows for the implementation of larger decoders without external inverters (e.g., a 24-line decoder can be implemented without external inverters, and a 32-line decoder requires only one inverter).
Applications
- High-performance memory systems to minimize system decoding delays.
- Data-routing applications requiring short propagation delay times.
- Demultiplexing applications where an enable input can be used as a data input.
- Cascading decoders to create larger decoding systems without the need for external gates or inverters.
Q & A
- What is the primary function of the SN74F138N?
The SN74F138N is a 3-line to 8-line decoder/demultiplexer, designed for high-speed memory-decoding and data-routing applications.
- What are the package options available for the SN74F138N?
The SN74F138N is available in various packages including plastic small-outline packages, ceramic chip carriers, and standard plastic and ceramic 300-mil DIPs).
- What is the operating temperature range for the SN74F138N?
The operating temperature range for the SN74F138N is 0°C to 70°C).
- How many enable inputs does the SN74F138N have?
The SN74F138N has three enable inputs: two active-low and one active-high).
- Can the SN74F138N be used for demultiplexing applications?
- What is the maximum output current in the low state for the SN74F138N?
The maximum output current in the low state is 40 mA).
- What is the storage temperature range for the SN74F138N?
The storage temperature range is –65°C to 150°C).
- How can larger decoders be implemented using the SN74F138N?
Larger decoders can be implemented without external inverters (e.g., a 24-line decoder can be implemented without external inverters, and a 32-line decoder requires only one inverter)).
- What are the typical applications of the SN74F138N?
- What is the supply voltage range for the SN74F138N?
