74AHC257PW,118

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Logic-signal switches, multiplexers, and decoders are extensively used in modern electronic devices for a variety of tasks.

The 74AHC257PW is a four-channel multiplexer which enables low-voltage data transfer between multiple digital devices. It is designed to switch between several digital signals, can be used to scan and route data and signals within a system, and provide one data or signal to many destinations. In addition to its low-voltage operation, the 74AHC257PW also features:

• High data rates up to 80 Mbps
• Low power consumption
• Low power supply noise and radiated emissions

The 74AHC257PW is used in a variety of applications, including:

• Low-level multiplexing, such as in set-top boxes, testers, and programmable logic controllers (PLCs)
• Switching, such as for frequency modulation (FM) audio/video components and mechanisms
• Bus control and arbitration, such as for digital systems using SPI, I2C, and CAN buses
• Scanning, such as for triggered data-acquisition cycles
• Scanning, such as for triggered data-acquisition cycles.

The 74AHC257PW allows 4-channel multiplexing between 4 data or signal sources, such as an Analog-to-Digital Converter (ADC) and Digital-to-Analog Converter (DAC), an optical network, or a variety of other digital sources. It works by routing or switching one signal or data stream between the desired sources.

The 74AHC257PW features an individual enable input (E0–E3) for each channel, as well as an enable input (EN) for all the channels. The channel enables are active-low and the logic-high level for all the channel enables is ‘high impedance’. This means that when the enable inputs are brought to a logical ‘high’, the channel outputs become electrically disconnected from the input.

In addition, the 74AHC257PW has an inverting input, which is used to invert the logic-level of the output. This feature makes the device suitable for applications requiring both inverting and non-inverting data paths.

The 74AHC257PW is suitable for most communication applications and provides a cost-effective and reliable way to multiplex digital data and signals. The device also meets the most stringent electromagnetic compatibility requirements and is a good choice for applications requiring low power consumption.

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