CD74HC257M

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Logic - Signal Switches, Multiplexers, Decoders are important standard digital logic devices used in numerous applications such as digital computers, automation circuits, communication systems, instrumentation and control equipment. The purpose of these gate arrays is to route alternating data signals in multiple directions depending on the device’s functioning. One such device, the CD74HC257M, is a popular component for switching, multiplexing, and decoding of digital signals.

The CD74HC257M, manufactured by Fairchild Semiconductor, is a high-performance, low-power, CMOS logic device. It operates at a voltage range of 1.65 - 5.5 V, and is characterized for operation at temperatures ranging from -55˚C to 125˚C. Its supply current is typically 2.6mA, but can reach as high as 12.5mA when logic high voltage is 5V. Its maximum output current ranges from 0.5mA to 1.5mA. The device also features a high-level output current capability of 56 mA, and a power dissipation of 80mW.

CD74HC257M is an octal bus transceiver, allowing high-speed signal transmission and signal switching and multiplexing between an 8-bit data bus and two control signal inputs (E1 and E2). By using these two control signal inputs and the associated logic signal, the data can be routed from input (A) to output (Y) buses. E1 controls the direction of the data flow, while a low signal on E2 enables the data transfer from input to output.

When E1 is Low, A bus data is enabled to Y bus. When E1 is high and data on A bus is enabled to Y bus, it is being multiplexed with E2 signal. Under normal operations, the E2 signal is low and this enables the transfer of data from A bus to Y bus. When E2 is high, the data is being multiplexed on Y bus.

Additionally, when E2 is High and E1 is Low, a latched 3-state is formed and data from A bus is enabled to Y bus. The latched 3-state is then disabled and data transfer to Y bus is stopped when E2 is taken low and does not repeat until E2 is taken high. When E2 is Low, then the input to Y bus is passively disabled, no matter what the levels of the E1 and A inputs.

CD74HC257M also offers enhanced noise margins and power supply noise immunity compared to comparable logic devices. This makes the device suitable for use in digital systems like microprocessors, featured supercomputers, programmable logic arrays and other logic systems operating at high speed. In addition, its reduced propagation delays feature makes the device more suitable for use in automated test applications.

CD74HC257M can be used in applications such as automotive door lock driver systems, copier/printer logic systems, network systems, cellular phone repeaters and data acquisition and processing systems. Additionally, this device is suitable for space-limited applications in many consumer electronics systems.

In summary, CD74HC257M is a high-performance octal bus transceiver manufactured by Fairchild Semiconductor. It is a digital logic device used for switching and multiplexing of data signals in many applications. It offers enhanced noise margins, power-supply noise immunity and low power consumption, making it suitable for digital systems operating at high speed. The device is commonly used in automotive door lock driver systems, copier/printer logic systems, network systems, cellular phone repeaters and data acquisition and processing systems, as well as in consumer electronics systems.

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