The SN74HC139 is a device designed for high-performance memory decoding or data routing applications that require very short propagation delay times. It is suitable for high-performance memory systems and can minimize the effects of system decoding. When used with high-speed memories utilizing a fast enable circuit, the delay time of this decoder and the enable time of the memory are usually less than the typical access time of the memory. This means that the effective system delay introduced by the decoder is negligible.
The SN74HC139-Q1 dual decoder/demultiplexer is intended for high‑performance memory‑decoding and data‑routing applications where short propagation delays are critical. It contains two independent 2‑line‑to‑4‑line decoders in a single package, with active‑low enable inputs that can also serve as data lines for demultiplexing.
Key features include a wide operating voltage range of 2 V to 6 V, typical propagation delay of about 10 ns, low power consumption (≈80 µA), and an output drive capability of ±4 mA at 5 V. The device is qualified for automotive use (AEC‑Q100) and is supplied in SOIC and TSSOP packages with detailed mechanical and thermal data provided.
| Operating voltage range | 2 V to 6 V |
|---|---|
| Typical propagation delay | 10 ns |
| Output drive capability | ±4 mA at 5 V |
| Low power consumption | 80 µA max |
| Recommended operating temperature | -40 °C to 125 °C |
The typical propagation delay is about 10 ns.
It operates from 2 V up to 6 V.
Each output can drive up to ±4 mA at a 5 V supply.
The recommended operating temperature range is –40 °C to 125 °C.