SN74F258NSR

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The SN74F258NSR is a device used in the logic and signal switch, multiplexer and decoder fields. It is a 21-bit 8-to-1 line multiplexer having three active-low chip select input signals and three active-low true output enable input signals. It has two types of outputs, namely the multiplexer and decoder outputs.

The SN74F258NSR multiplexer is used when selecting one signal from several different signals. The 21-bit channel address consists of 8 bits for selecting one of the eight active-low chip select signals and the remaining 13 for selecting one of the eight true output enable signals. The two active-low chip select signals and three active-low true output enable signals are required to select a single channel. The output level is unknown until the associated chip select (CS) and true output enable (OE) have been activated.

The SN74F258NSR decoder is capable of granting priority to an incoming signal, allowing it to pass through without being blocked. When an input is applied to the decoder, it can recognize and interpret the signal and respond accordingly, generating an appropriate response. This ability to distinguish between different types of signals is especially useful in broadcast systems, as it can enable higher priority signals coming from the same source to have their transmission uninterrupted by lower priority signals.

Both the multiplexer and decoder outputs from the SN74F258NSR are TTL compatible and can support a wide range of logic levels, including standard TTL and CMOS logic. The device is capable of operating with supply voltages from 3 V to 20 V and output current of up to 16 mA. The SN74F258NSR can operate up to a maximum frequency of 80 MHz, allowing it to be used in high speed applications.

The SN74F258NSR is an extremely useful device, being able to efficiently perform the functions of an 8-to-1 multiplexer, decoder and priority encoder, all in one package. It has the advantage of being readily available and is relatively cheap, making it a viable option for any circuit that requires a logic or signal switch, multiplexer or decoder.

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