Overview
The SN74LS138DR is a 3-line to 8-line decoder/demultiplexer integrated circuit manufactured by Texas Instruments. This component is part of the 74LS series and is designed for high-speed applications, particularly in memory decoding and data transmission systems. It features Schottky-clamped TTL MSI circuits, which provide high performance and short propagation delay times, making it suitable for use in high-performance memory systems and data-routing applications.
Key Specifications
| Parameter | Value |
|---|---|
| Package | 16-SOIC (0.154", 3.90mm Width) |
| 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 | Surface Mount |
Key Features
- Designed specifically for high-speed applications such as memory decoders and data transmission systems.
- 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.
- Enable input can be used as a data input for demultiplexing applications.
- ROHS compliant and lead-free.
Applications
- High-performance memory decoding and data-routing applications.
- Memory systems requiring very short propagation delay times.
- Data transmission systems where high speed and low latency are critical.
- Cascading and expanding decoder/demultiplexer circuits without the need for external gates or inverters).
Q & A
- What is the SN74LS138DR used for?
The SN74LS138DR is used as a 3-line to 8-line decoder/demultiplexer in high-speed applications such as memory decoding and data transmission systems).
- What package type does the SN74LS138DR come in?
The SN74LS138DR comes in a 16-SOIC (0.154", 3.90mm Width) package).
- What is the operating temperature range of the SN74LS138DR?
The operating temperature range of the SN74LS138DR is from 0°C to 70°C).
- What is the voltage supply range for the SN74LS138DR?
The voltage supply range for the SN74LS138DR is from 4.75 V to 5.25 V).
- Is the SN74LS138DR ROHS compliant?
Yes, the SN74LS138DR is ROHS compliant and lead-free).
- What are the key features of the SN74LS138DR?
The key features include Schottky-clamped for high performance, three enable inputs, fully buffered inputs, and the ability to use an enable input as a data input for demultiplexing).
- How does the SN74LS138DR simplify cascading and data reception?
The SN74LS138DR simplifies cascading and data reception through its three enable inputs, reducing the need for external gates or inverters).
- What types of applications benefit from using the SN74LS138DR?
Applications that benefit include high-performance memory decoding, data transmission systems, and any system requiring short propagation delay times).
- Can the SN74LS138DR be used in military temperature ranges?
No, the SN74LS138DR is characterized for operation from 0°C to 70°C, not the full military temperature range).
- How many normalized loads do the inputs of the SN74LS138DR represent?
Each input of the SN74LS138DR represents only one normalized load to its driving circuit).
