DM74AS157SJ

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The DM74AS157SJ is a logic device belonging to the category of logic, signal switches, multiplexers, and decoders. It is a quad, 2-to-4 line decoder, developed by National Semiconductor. This device enables data processing, where four data lines (inputs) are received and one line (output) is selected based on the two binary address lines. The decoder allows the user to select a single output line from the four available inputs, based on the binary input. This makes the device especially useful for data processing applications where the processor chip must be able to differentiate between the multiple input lines and select a single output for further processing.

The DM74AS157SJ has four active low inputs (A0, A1, A2, A3), two active low address inputs (A and B), and four active low outputs (Y0, Y1, Y2, and Y3). When both address inputs (A and B) are in the low state, all four outputs (Y0 – Y3) are in the logic low state. If any one of the inputs (A0 – A3) is at logic low state, then the corresponding output (Y0 – Y3) is in the logic high state. This effect can be used in many digital applications where a two-bit binary address is used to select one output from four different inputs.

The DM74AS157SJ operates on a wide range of voltage ranges from 4.75 V to 5.25 V. It also features static power dissipation of 3.0 mW/pin and a maximum operating temperature of 125°C. Additionally, the device has short circuit protection for the outputs, meaning that it can withstand short circuit conditions of up to 1 second. The device also features real-time outputs and is compatible with both TTL and CMOS logic.

The DM74AS157SJ is widely used in digital data processing applications. It is found in many digital systems where data transmission over multiple lines requires encoding before transmission. The device is also often used as an address selector in systems that require multiple sources of data to be addressed at the same time.

The working principle of the DM74AS157SJ is based on the two-bit binary address selection. When the two bits A and B of the binary code are set to either logic high or logic low, the corresponding outputs Y0 to Y3 are activated. The output lines are activated only when one of the four low inputs (A0 to A3) are in the low state. If all of the inputs are at the high state, then all of the outputs will also be at the high state.

In conclusion, the DM74AS157SJ is a quad 2-to-4 line decoder developed by National Semiconductor that finds application in digital data processing applications. It features short-circuit protection, real-time outputs, a wide operating voltage range and a maximum operating temperature of 125°C. The device’s working principle is based on the two-bit binary address selection, which enables the user to select a single output line from the four available inputs, based on the binary input.

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