MC74LVX257DTR2G

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The MC74LVX257DTR2G is a logic circuit device that falls in the category of logic - signal switches, multiplexers, and decoders. Designed and manufactured by ON Semiconductor, this device is an integrated circuit which is built on an N-channel silicon-gate CMOS process. It is an 8-bit multiplexer/demultiplexer which is made up of two 4-bit buffers/demultiplexers, each with independent outputs, enables, and data input selection. This device also features busy latch, which is a transparent latch that stores the data provided at the data input pins. It requires a standard VL-TTL logic family input level to work, which can be attained using amplifier ICs.

The application of this device is mainly in multiplexer and buffer applications, in which various signals are combined or separated. The box features four highly versatile inputs and eight output ports, making it suitable for diverting the signals from one port to another. The combinational logic capability of this device also makes it suitable for decoding applications in which data signals are used for guessing a unique input pattern. It is also used extensively in LCD displays and other interfacing applications.

The main working principle behind this device is based on two 4-bit demultiplexers. Each of these demultiplexers has four data-inputs (D0 through D3), four active-low outputs (Y0 through Y3), and two data-select inputs (SEL and SEL*). Depending on the settings of both SEL inputs, the demultiplexer will select one of the four data-inputs and will store it in a transparent latch. This latch is also known as busy latch and it will pass the data at the respective data-output port until the data is overwritten.

The MC74LVX257DTR2G features a three-state output which further increases the capability of this device by allowing the output pins to be in either the high-impedance state (Hi-Z), Logic 0 state (L) or Logic 1 state (H). The output state of this device is controlled by two control pins, OEN and OEN*. When the control pins are at a logic high, the attached output port will assume a high-impedance state, otherwise it will assume the last data-input state.

In summary, MC74LVX257DTR2G is a versatile logic-circuit device featured in the categories of symmetric switches, multiplexers, demultiplexers, and decoders. This integrated circuit can be utilized in many applications that require the transfer of multiple data signals from one port to another or enable the decoding of an input data pattern. The logic of this device is quite simple; the data-input is transversely latched in the busy latch and then selectively passed on to the corresponding output port based on the select signal.

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