Overview
The SN74LS139A, produced by Texas Instruments, is a dual 2-line to 4-line decoder/demultiplexer integrated circuit. This component is designed for high-performance applications, particularly in memory decoding and data transmission systems. It features two fully independent 2-line to 4-line decoders in a single package, making it highly versatile for various digital circuit designs.
The SN74LS139A is part of the 74LS family, known for its Schottky-clamped TTL (Transistor-Transistor Logic) technology, which enhances performance by reducing propagation delay times and suppressing line ringing. This makes it ideal for use in high-speed memory systems where minimal system delay is crucial.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package Type | SOIC (D) | - |
| Pins | 16 | - |
| Operating Temperature Range | 0 to 70 | °C |
| Supply Voltage (VCC) | 4.5 to 5.5 | V |
| High-Level Input Voltage (VIH) | 2 | V |
| Low-Level Input Voltage (VIL) | 0.7 to 0.8 | V |
| High-Level Output Current (IOH) | -0.4 | mA |
| Low-Level Output Current (IOL) | 4 to 8 | mA |
| Propagation Delay Time (tPLH, tPHL) | 3 to 17 | ns |
Key Features
- Designed specifically for high-speed memory decoders and data transmission systems.
- Two fully independent 2-line to 4-line decoders/demultiplexers in a single package.
- Schottky-clamped for high performance, reducing propagation delay times and suppressing line ringing.
- Fully buffered inputs, each representing only one normalized load to its driving circuit.
- Active-low enable input can be used as a data line in demultiplexing applications.
Applications
- High-performance memory systems to minimize system decoding delays.
- Data routing and transmission systems requiring short propagation delay times.
- Demultiplexing applications where the active-low enable input can be used as a data line.
- General digital circuit designs requiring fast and reliable decoding/demultiplexing functions.
Q & A
- What is the SN74LS139A used for?
The SN74LS139A is used as a dual 2-line to 4-line decoder/demultiplexer, particularly in high-performance memory decoding and data transmission systems.
- What is the package type of the SN74LS139A?
The SN74LS139A is available in a SOIC (D) package with 16 pins.
- What is the operating temperature range of the SN74LS139A?
The operating temperature range is from 0°C to 70°C.
- What is the supply voltage range for the SN74LS139A?
The supply voltage range is from 4.5 V to 5.5 V.
- What are the key features of the SN74LS139A?
Key features include Schottky-clamped technology, fully buffered inputs, and active-low enable inputs that can be used as data lines in demultiplexing applications.
- How many decoders are included in the SN74LS139A?
The SN74LS139A includes two fully independent 2-line to 4-line decoders in a single package.
- What is the propagation delay time of the SN74LS139A?
The propagation delay time (tPLH, tPHL) ranges from 3 to 17 ns.
- Can the SN74LS139A be used in demultiplexing applications?
- What are some common applications of the SN74LS139A?
- Is the SN74LS139A suitable for high-speed memory systems?
