CD74ACT257EG4

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The CD74ACT257EG4 is a high speed CMOS under the family of devices called 8-Bit Data Selectors/Multiplexers. The device properties give it the ability to operate at rates up to 70MHz and the ability to integrate with other complementary devices to create a simple 8-Bit multiplexer user system. As the world becomes faster and more data hungry, the ability to multiplex multiple data sources to a single interface is increasingly critical. There are many applications for the ACT257, from multiplexing several data streams from various input sources to allowing efficient data transfer over a single output.

The ACT257 operates off a single positive supply voltage between the range of +2 V to +6 V, with power consumption of 3.2 mW typical. The logic thresholds are VIL and VIH, set to 0.8V and 2.0V, respectively. It is possible to obtain data transfer rates of up to 200 Mbps by using the ACT257. The propagation delay is typically only 3 ns. The ACT257 is available in a 16-pin package and is pin and function compatible with the 74LS257.

The ACT257 includes four 8-input multiplexers with two select inputs and one output, the /OE pin, provide support for the expansion of the data bus. The device also has a number of features to improve system performance. These features include low power, high speed operation, controlled rise and fall times, and wide input level range. In addition, it is also designed to protect against simultaneous switching noises (SSN) from multiple input sources.

The working principle of the ACT257 is based on the eight NAND logic gates that are generated from the eight data inputs and the two select inputs. Any of the eight inputs can be selected and output on the /OE pin depending on the logic state of the two select inputs. The power of the device lies in its ability to access any of the data inputs with independent control at the select inputs. This allows the user to select and multiplex multiple data streams into a single output.

The ACT257 is used in a broad range of applications where high speed data multiplexing is required. This includes applications where the user needs to multiplex multiple ADCs or other data converters, multiple video streams, microprossor data, or digital isolators. It can also be used in analog to digital converter systems protecting the sensitive analog inputs from large voltage swings. The CD74ACT257EG4 is ideal for applications where space is limited and small packages are required.

The CD74ACT257EG4 is a reliable, easy to use 8-Bit multiplexer suitable for many applications where data multiplexing is required. With its fast speed, wide range of input levels, and low power dissipation, the ACT257 is the perfect choice for high speed multiplexing of multiple data streams. The device is easy to use and pin compatible with other devices in the series making it cost effective for use in high speed applications.

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