MC74ACT139DG

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Logic - signal switches, multiplexers, decoders are devices responsible for decoding digital signals for various applications. MC74ACT139DG is a widely used dual 2 to 4 decoders/demultiplexers which are widely used in digital circuit and system design. The decoder and demultiplexer designed with low power Schottky TTL (LSTTL) technology provides high speed performance. This paper will highlight the application field and working principle of MC74ACT139DG.

MC74ACT139DG is widely used in systems that require partial decoding or have many branches at a high frequency. The device contains two inverting 2 to 4 line decoders/demultiplexers with common active-low output enable inputs, OEn. The device selects one-of-four data sources by decoding the two binary address inputs, A and B. The binary address input can be coded in either true or inverted logic forms. When OEn is low all outputs are low. This device can be used as a tone decoder, data selectors/ multiplexers, and a 1 of 8 data selector/ multiplexer to mention just a few.

The MS-II logic integrated circuit acts as ancilla to the MC74ACT139DG. The MS-II acts as an active low oscillator to provide the two-bit binary address inputs. It is programmed as an oscillator with an avalanche pull up timing circuit. The output of the MS-II can be set to timed outputs in 5 V accepted logic levels. The MC74ACT139DG with its integrated MS-II logic can be used in data routing and data buffering applications.

The MC74ACT139DG functions as a dual 2-to-4 line decoders/demultiplexers. The binary inputs A and B are decoded to activate one of the four output lines. When OEn is low, all output lines are held low regardless of the state of the address inputs. The decoder also provides function expansion for fewer address lines than the number of outputs. This application is known as partial decoding or selection decoding. It has two enable inputs (OEn) which control the output enable (OE) of the selected output line. The active low enables allow multiple decoders to be connected to generate the desired number of outputs.

The MC74ACT139DG is widely used in various digital devices including dynamic RAMs (DRAMs), microprocessors, microcontrollers, digital signal processors, and other microelectronic devices. It is a popular device because of its small size, low power consumption, and its low power Schottky TTL (LSTTL) technology. It is used to eliminate the need for bulky, expensive glue logic when multiplexing and storing data.

The MC74ACT139DG is a high performance device used to decode signals and reduce propagation delays. It is also an ideal choice for high frequency and low-power applications due to its low-power Schottky TTL technology. The device is programmable to many different logic functions, which makes it easy to use in a variety of applications. In addition, the MC74ACT139DG is designed to be highly reliable, and its logic functions are compatible with high-speed asynchronous logic, digital devices and CPU\'s.

In summary, the MC74ACT139DG is a widely used dual 2 to 4 decoders/demultiplexers and is applicable in various digital devices. It uses low power Schottky TTL (LSTTL) technology and is able to decode signals in both true and inverted logic formats. The device is also programmable to many different logic functions, making it a great choice for high-frequency and low-power applications. The MC74ACT139DG is designed to be reliable and compatible with existing high-speed logic, digital devices, and CPUs.

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