SN74AS138DR

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Signal switches, multiplexers and decoders are components used in digital circuits for the purpose of signal routing, signal selection, signal decoding, and signal isolation. The SN74AS138DR is an integrated circuit (IC) designed specifically for this purpose. The SN74AS138DR is a high-speed, high-reliability decoding device, capable of providing up to 4 TTL compatible outputs in response to 4 bit binary address inputs.

The SN74AS138DR is an active-high device where all outputs become high when no input active. In response to an active four-bit address input, the outputs will be activated in the complementary order. All control inputs are TTL compatible, and the SN74AS138DR is manufactured using CMOS technology, making it usable in many different applications. The device has 16 lead dual in-line packages (DIPs). The low profile package makes the SN74AS138DR suitable for high density applications.

The SN74AS138DR is an IC that can be used in many applications. The most common field of application for the SN74AS138DR is multiplexing a variety of circuits--such as digital-to-analog converters, video encoders, analog filters, and data acquisition pipelines--where a single device can perform multiple tasks. It is also used to switch power circuits on and off, and control or activate various clocks or frequency signals.

The working principle of the SN74AS138DR is quite simple. The 4-bit address inputs indicate the state that the 4 outputs should enter. The address inputs have a positive internal pull-up, which makes them active-high. When the address inputs are enabled, the device will activate one of the complementary outputs corresponding to the address specified. All outputs are active-high and decommit immediately when the active input goes inactive.

The SN74AS138DR offers many advantages over similar devices. It has a high speed, with propagation delays of only 24 nanoseconds and delay skew of only 10 nanoseconds. This makes it suitable for applications requiring fast switching times. Additionally, the SN74AS138DR features a low operating current of only 33 μA and a low power consumption of only 600 μW, making it suitable for low power applications. It also features a high-reliability TTL compatible output, which allows it to be used in multiple high-reliability applications.

In conclusion, the SN74AS138DR is an integrated circuit designed specifically for signal routing, selection, decoding, and isolation. It is commonly used in multiplexing applications, as well as in power switch and clock control circuits. It has fast switching speeds and low power consumption, making it suitable for many different applications. The device is manufactured using CMOS technology and has a low profile DIP package, suitable for high density applications.

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