M74HCT157RM13TR

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The M74HCT157RM13TR is a high-speed CMOS logic device produced by STMicroelectronics. It belongs to the Logic - Signal Switches, Multiplexers and Decoders family and is designed to support applications that require fast switching between multiple parallel inputs and outputs. This device contains four multiplexers, each of which can selectively connect any of the four reference inputs to one of four complementary outputs. The four multiplexers share the same four reference inputs, which are identified by the letters A, B, C, and D. Each multiplexer can be enabled and disabled on demand, allowing for the data flow to be rapidly switched from one input to another input in the same multiplexer, or from one multiplexer to another. In addition, the four multiplexers can be cascaded such that any reference input D can be connected to an output of multiplexer 1 and any reference input A can be connected to an output of multiplexer 4.

The M74HCT157RM13TR device is powered by a single supply voltage, making it suitable for powering many projects and applications. It requires a VDD operating voltage range of 7V to 20V and a maximum VCC power supply current of 6mA. The maximum operating frequency of the device is 25MHz. When enabled, the device supports up to a maximum switching time of 20ns, allowing data flow to be switched from one input to another quickly and efficiently. The output levels of the M74HCT157RM13TR are specified as 0.27V (maximum) and 0.36V (minimum) for high levels, and 0.81V (maximum) and 0.5V (minimum) for low levels.

The typical application for the M74HCT157RM13TR is to switch between multiple parallel inputs or outputs in high-speed communication applications. It is often used in VGA video systems, where data is rapidly switched between multiple video sources or controllers. It is also used in automotive networks, where it is used to switch between multiple ECUs (electronic control units) and sensors.

The working principle of the M74HCT157RM13TR is based on the analog multiplexer. This device contains four multiplexers, each of which can connect any of the four reference inputs to one of four complementary outputs, with the input and output channels linked together in an interconnection network. The four multiplexers are organized as low and high speed logic blocks, allowing data to be switched from one reference input to another quickly and efficiently. The selection of which reference input is connected to which output is determined by applying signals to four select inputs.

In summary, the M74HCT157RM13TR is a versatile device belonging to the Logic - Signal Switches, Multiplexers and Decoders family. It is widely used in high-speed communication applications, such as VGA video systems, automotive networks, and other digital systems. By controlling the four select inputs, the M74HCT157RM13TR allows data to be quickly and easily switched between multiple parallel inputs or outputs. The device is powered by a single supply voltage, has a maximum operating frequency of 25MHz, and supports up to a maximum switching time of 20ns.

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