SN74ALS139DR

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The SN74ALS139DR is a high-performance TTL and DTL compatible device that combines decoders, multiplexers, and signal switching functions. It is designed for a wide variety of logic-level applications including data paths, memory address select, translations, and arithmetic logic. This device features low power consumption, low propagation delays, and wide supply voltage range.

The SN74ALS139DR functions as an 8 to 1 multiplexer and has two decoder digital outputs. It provides two 8 bit data inputs, two 3 bit address inputs, two 9 bit data outputs, and two active LOW enable inputs. The two enable inputs are active LOW, meaning that a logic LOW input will enable the decoding/multiplexing function while a logic HIGH signal will disable it. The device also has a full/8 bit select input. When this input is logic HIGH, the device will operate in 8 bit mode, multiplexing eight data inputs and providing two 9 bit data outputs; when it is LOW, full mode operation takes place and the device functions as a 16 bit multiplexer. Additionally, the SN74ALS139DR has two output enable inputs (OE1 and OE2). When both of these inputs are logic LOW, output drivers are disabled, thus allowing the device to function as a signal switch.

The SN74ALS139DR operates from a single power supply ranging from +3V to +12V, allowing it to operate in a wide variety of applications. The device features very fast switching times, with maximum propagation delays of only 50ns at +5V and 60ns at +12V. Power consumption is kept low, with average operating current of 30mA at +5V and 100mA at +12V. The SN74ALS139DR family also has a wide operating temperature range, from 0°C to 70°C.

The SN74ALS139DR is suitable for many logic-level applications including data paths, memory address selection, translating and arithmetic functions, decoding and multiplexing, and signal switching. Its fast switching speeds and wide supply voltage range make it an ideal choice for high-speed applications, while its low power consumption and wide operating temperature range make it suitable for low-power, industrial applications. It is also easy to integrate into designs thanks to its small packaging size.

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