Overview
The SN74LS138N is a high-speed 1-of-8 Decoder/Demultiplexer integrated circuit manufactured by Texas Instruments. This device is part of the 74LS series and is designed for high-performance applications, particularly in memory decoding and data-routing systems. It features Schottky-clamped TTL MSI circuits, which provide high-speed operation and short propagation delay times, making it ideal for use in fast memory systems and data transmission applications.
Key Specifications
| Parameter | Value |
|---|---|
| Part Number | SN74LS138N |
| Manufacturer | Texas Instruments |
| Category | Integrated Circuits (ICs) - Logic - Signal Switches, Multiplexers, Decoders |
| Package | 16-DIP (0.300", 7.62mm) |
| Series | 74LS |
| Type | Decoder/Demultiplexer |
| Circuit | 1 x 3:8 |
| Independent Circuits | 1 |
| Current - Output High, Low | 400µA, 8mA |
| Voltage Supply Source | Single Supply |
| Voltage - Supply | 4.75 V ~ 5.25 V |
| Operating Temperature | 0°C ~ 70°C |
| Mounting Type | Through Hole |
Key Features
- Designed specifically for high-speed applications in memory decoding and data transmission systems.
- Features three enable inputs to simplify cascading and/or data reception.
- Schottky-clamped for high performance and to suppress line-ringing.
- Fully buffered inputs, each representing only one normalized load to its driving circuit.
- Can be used to minimize the effects of system decoding in high-performance memory systems.
- Enable inputs can be used as data inputs for demultiplexing applications.
Applications
- High-performance memory decoding in computer systems.
- Data-routing applications requiring short propagation delay times.
- Data transmission systems where high speed and reliability are crucial.
- Cascaded decoder implementations for larger decoding requirements (e.g., 24-line or 32-line decoders).
Q & A
- What is the primary function of the SN74LS138N?
The SN74LS138N is a 1-of-8 Decoder/Demultiplexer, designed to decode one of eight lines based on the conditions at the three binary select inputs and the three enable inputs.
- What package type does the SN74LS138N come in?
The SN74LS138N comes in a 16-DIP (0.300", 7.62mm) package.
- What is the operating temperature range of the SN74LS138N?
The operating temperature range is from 0°C to 70°C.
- What are the voltage supply requirements for the SN74LS138N?
The voltage supply range is from 4.75 V to 5.25 V.
- How many enable inputs does the SN74LS138N have?
The SN74LS138N has three enable inputs.
- What is the purpose of the Schottky diodes in the SN74LS138N?
The Schottky diodes are used to suppress line-ringing and to simplify system design.
- Can the SN74LS138N be used for demultiplexing applications?
- How does the SN74LS138N minimize system decoding delays in memory systems?
The SN74LS138N minimizes system decoding delays by having short propagation delay times, which are usually less than the typical access time of the memory.
- Can the SN74LS138N be cascaded for larger decoding requirements?
- What are some common applications of the SN74LS138N?
