CD74AC257E

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Logic signal switches, multiplexers, and decoders are components which aim to route signals and data between digital circuits. They direct the signals from one source to multiple destinations and relative paths of data with the use of various automatic logic and gate configurations. One example of a high-performance automated device is the CD74AC257E, which is a quad 2-input multiplexer with complementary outputs. This article reviews the application field and working principle of this product, as well as other features which allow it to distinguish itself from the crowd.

Application Field

The CD74AC257E multiplexer is an advanced integrated logic device providing various features that are essential to the reliable functioning of high-speed logic systems. This multiplexer is suited for a variety of applications including data acquisition, instrumentation, industrial automation, consumer digital and electronic products, and computer peripherals. This product is also popularly used in memory applications, providing the convenience of easily sourcing and sinking data, as well as its low-power performance characteristics.

Furthermore, this multiplexer is characterized by a low derating requirement of ≤1.5V. This allows improved design flexibility and operational ease when compared to other traditional devices. With an array of control terminals, this device has the ability to quickly switch between two sources of data or control signals, thus allowing for rapid data transfer over multiple paths. Additionally, this device is designed with Schmitt-trigger logic inputs, which eliminates the need for external logic gates or buffers.

Working Principle

The CD74AC257E is a combination of four two-input multiplexers which has two select input lines which can be used as either combinational or fully static inputs. Each of the two input lines is connected to two of the four multiplexers, hence allowing the selection of one of four inputs into the multiplexer’s output. This is enabled by an active clock, which is used to initiate the selection of an input signal and the passage of this signal to the output.

At any one time, the CD74AC257E multiplexer is enabled to select one of four inputs and direct it to the output by performing the necessary logic combinations. This allows the multiplexer to route the signal of interest to the relevant output. Additionally, when no signal is detected, the multiplexer’s complementary outputs are enabled, providing a signal which is inverted in logic in relation to the original output.

The CD74AC257E multiplexer has an advantage over other types of logic signal switches in the form of the Schmitt-trigger function. This function allows for improved device reliability, due to the increase in the number of transitions which the signal can dynamically experience. This increases device performance, particularly for high-speed data transfer applications.

Electrical Characteristics

The CD74AC257E multiplexer is rated to operate using two voltage supplies. This dual channel feature is essential for maximizing reliability and maintaining a high-speed performance. Under normal conditions, each channel is supplied a voltage of 5V, while the maximum voltage is established at 7V. This device’s operating temperature is fixed at -55°C to 125°C.

The input signal range is established between 0V to 3.6V for low logic levels and between 2V to 7V for high logic levels. The output signal range is determined at-0.4V and 6V for low logic levels, and between 3.2V and the channel’s respective supply voltage for high logic levels. Additionally, the on-chip ESD protection is rated at up to 10V.

Conclusion

The CD74AC257E multiplexer is a high-performance automated device, which is extensively used in numerous applications. This multiplexer is characterized by its low derating requirement of less than 1.5V and the incorporation of the Schmitt-trigger function. This device is incredibly adaptable and reliable, boasting diverse operational supply voltages and electrical characteristics. For those in need of a reliable logic switch, multiplexer, or decoder, the CD74AC257E could be an ideal choice.

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