Overview
The SN74LS138DRE4, produced by Texas Instruments, is a 3-line to 8-line decoder/demultiplexer integrated circuit. This component is part of the 74LS series, known for its low power Schottky (LS) technology, which offers high performance and low power consumption. The SN74LS138 is designed for high-speed applications, particularly in memory decoding and data transmission systems, where short propagation delay times are crucial.
Key Specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package Type | 16-SOIC (0.154", 3.90mm Width) |
| Pins | 16 |
| Operating Temperature Range | 0°C to 70°C |
| Voltage Supply | Single Supply: 4.75 V ~ 5.25 V |
| Current - Output High, Low | 400µA, 8mA |
| Mounting Type | Surface Mount |
| RoHS Compliance | Yes |
Key Features
- High-Speed Operation: Designed for high-performance memory decoding and data transmission systems, featuring short propagation delay times.
- Decoder/Demultiplexer Functionality: Decodes one of eight lines based on three binary select inputs and three enable inputs.
- Enable Inputs: Two active-low and one active-high enable inputs simplify cascading and data reception, reducing the need for external gates or inverters.
- Schottky-Clamped: High-performance Schottky diodes suppress line-ringing and simplify system design.
- Fully Buffered Inputs: Each input represents only one normalized load to its driving circuit.
Applications
- Memory Decoding: Used in high-performance memory systems to minimize system decoding delays.
- Data Transmission Systems: Suitable for applications requiring fast data routing and decoding.
- Demultiplexing: Can be used as a demultiplexer with an enable input serving as a data input.
- High-Speed Digital Systems: Ideal for systems that require low propagation delay times and high reliability.
Q & A
- What is the primary function of the SN74LS138DRE4?
The primary function is to act as a 3-line to 8-line decoder/demultiplexer.
- What is the operating temperature range of the SN74LS138DRE4?
The operating temperature range is from 0°C to 70°C.
- What type of package does the SN74LS138DRE4 come in?
The component comes in a 16-SOIC package.
- What is the voltage supply range for the SN74LS138DRE4?
The voltage supply range is from 4.75 V to 5.25 V.
- Is the SN74LS138DRE4 RoHS compliant?
Yes, the SN74LS138DRE4 is RoHS compliant.
- What are the key features of the Schottky diodes in the SN74LS138DRE4?
The Schottky diodes suppress line-ringing and simplify system design.
- How many enable inputs does the SN74LS138DRE4 have?
The component has three enable inputs: two active-low and one active-high.
- Can the SN74LS138DRE4 be used as a demultiplexer?
Yes, it can be used as a demultiplexer with an enable input serving as a data input.
- What are typical applications for the SN74LS138DRE4?
Typical applications include high-performance memory systems, data transmission systems, and high-speed digital systems.
- How do the enable inputs simplify system design?
The enable inputs reduce the need for external gates or inverters when expanding the decoder/demultiplexer functionality.
