SN74ALS139N

The SN74ALS139N is a dual 2-line to 4-line decoder/demultiplexer IC manufactured by Texas Instruments. It is designed for high-performance memory-decoding and data-routing applications requiring short propagation delay times.

This device features two independent 2-line to 4-line decoders within a single package. Each decoder has an active-low enable input that can also function as a data line in demultiplexing scenarios. The SN74ALS139N operates with a single supply voltage ranging from 4.5V to 5.5V. Its inputs are fully buffered, presenting only one normalized load to the driving circuit, and are clamped with Schottky diodes to suppress line ringing.

The SN74ALS139N is characterized for operation within an ambient temperature range of 0°C to 70°C. It is packaged in a 16-pin Dual In-line Package (PDIP) with a 0.300-inch (7.62mm) body width, suitable for through-hole mounting. The component delivers an output current of 400µA for low states and 8mA for high states.

This decoder/demultiplexer is suitable for applications in high-speed memory systems where minimizing decoding delay is critical. Its design allows for efficient system decoding, making the effective system delay negligible when used with fast-enable memory circuits.