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The Philips 74F139 is a high‑speed dual 1‑of‑4 decoder/demultiplexer available in 16‑pin DIP and SO packages. Each decoder accepts two binary weighted inputs and provides four mutually exclusive active‑low outputs with a typical propagation delay of 3.3 ns.
The datasheet includes ordering information, pin configurations, absolute maximum ratings, recommended operating conditions, DC and AC electrical characteristics, test circuit waveforms, and detailed packaging quantity tables for various package types.
| Supply voltage (recommended) | 4.5 V – 5.5 V |
|---|---|
| High‑level input voltage (Vih) | 2.0 V |
| Low‑level input voltage (Vil) | 0.8 V |
| High‑level output current | -1 mA |
| Low‑level output current | 20 mA |
| Unit load definition | 20 µA (high) / 0.6 mA (low) |
One unit load is defined as 20 µA when the output is high and 0.6 mA when the output is low.
The recommended supply voltage range is 4.5 V to 5.5 V, with a typical value of 5.0 V.