LS139

The LS139 is a high-performance dual 1-of-4 decoder and demultiplexer integrated circuit designed for fast switching applications. Fabricated using the Low Power Schottky (LSTTL) semiconductor process, this device delivers rapid propagation speeds while maintaining low power consumption. The chip integrates two completely independent decoder sections, each accepting two binary weighted address inputs and providing four mutually exclusive active-low outputs.

Each decoder section includes an active-low enable input that can alternatively function as a data input, allowing the device to operate effectively as a 4-output demultiplexer. Additionally, each half can be configured as a function generator to produce all four minterms of two variables. The internal design incorporates input clamp diodes to limit high-speed termination effects and offers robust electrostatic discharge (ESD) protection rated above 3500 volts.

Compatible with standard Motorola TTL families, the LS139 ensures seamless integration into existing digital logic architectures. It is manufactured using a Schottky barrier diode process to guarantee high speed and reliability across various industrial and commercial environments. The component supports multiple mounting configurations to suit different PCB layout requirements.

Engineers utilizing the LS139 benefit from its multifunction capability and straightforward interface. Its active-low output structure simplifies interfacing with subsequent logic stages, while the dedicated enable pins provide precise control over data routing. This makes the LS139 a versatile solution for address decoding, data distribution, and general-purpose logic generation in embedded systems and control panels.