CD74HCT257EG4

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CD74HCT257EG4 is a logic signal encoding unit from Texas Instruments. It is wide used in various of application fields as a part of digital circuits.

CD74HCT257EG4 is categorized as logic signal switches, multiplexers, and decoders. This logic multiplexer has 128 bytes of input data but just 8 bytes of output data. It can select the desired data from thousands of input data and transfer it to a specific output.

As a multiplexer, CD74HCT257EG4 can select one of 2^n address data and convert it to an 8 bit output. It is used in memory mapping, data communications and audio video controller.

The working principle of CD74HCT257EG4 is quite simple. By applying logic signals to its select inputs, the output will be set to the logic high level at the same time. The logic signal is varied through the use of two control signals. A low signal will switch off the circuit for a fractional second then switch back on again. This switching action of the control lines acts as a strobe to capture the data. The data input is enabled only when the strobe is high and the data is loaded into the output register.

The signal encoding unit consists of eight 3-state buffers, each having three high performance inputs. These buffers provide high level outputs, allowing multiple devices to be connected across buses. Each buffer is enabled separately thus allowing multiplexing. The buffers have TTL input and output compatibility.

CD74HCT257EG4 is used to achieve MP3 decoding, digital decoding, and data transmission functions. In MP3 decoding, CD74HCT257EG4 is responsible for transmission of data to CD-ROM or hard disk. For digital decoding, the logic signal level processor can reconstruct a CD-Rom signal into a PCM stream for decoding. It is also used for data transmission such as networking, DVI and modem.

In conclusion, CD74HCT257EG4 is a logic signal encoding unit categorized as logic signal switches, multiplexers, and decoders. It can select one of 2^n address data and convert it to an 8 bit output. It is used for multiplexing, MP3 decoding, digital decoding and data transmission.

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