CD74HC257MT

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The CD74HC257MT is a high-speed, high-performance advanced CMOS logic device. It is a quad 2-to-1 multiplexer/demultiplexer, supplied in a 20-pin TSSOP (Thin Shrink Small Outline Package). The device can be used in both analog and digital applications to switch between two inputs or to multiplex two signals into one output.

The device features an interface that is compatible with CMOS, TTL, and NMOS logic families. The pins provide a TTL-compatible logic power supply voltage range of 4.3 to 5.2 V. It is also specified for operation over a wide temperature range of -40°C to +85°C. The device allows two independent data sources to be connected to a single output.

The CD74HC257MT belongs to the Logic - Signal Switches, Multiplexers, Decoders category of devices. It is intended to be used as a logic level translator and signal multiplexer. The device can be used in applications such as telecommunications and control networks as well as in motor control and robotics. In addition, it can be used for level shifting and multiplexing in distributed systems.

The device is an active high device, which means that the output is high when all inputs are selected. Each multiplexer pair is controlled by two analog or binary select signals. A high logic level on the select inputs switches the input sources to the multiplexer output. A low logic level on the select input turns off both the input sources and results in a high impedance output.

The CD74HC257MT also features an open drain output which can be used to activate multiple multiplexers, to generate a pulse, or to switch signals up to 48 mA peak. The output can also be used as an input, which allows small signals to be converted into larger signals. This can be useful in frequency-sensitive applications such as phase-locked-loop circuits.

The device has an input range of up to 24V. This means it can handle a wide variety of input signals, including both ac and dc signals. It also has a low power consumption of only 0.4 mA when disabled – allowing for long battery life in portable applications. Additionally, the device is available in both 20-pin packages for space-constrained applications, and 28-pin packages for applications requiring more I/O.

By combining the properties of CMOS logic and analog multiplexing, the CD74HC257MT is a versatile and cost-effective way to switch data sources to a single output. With the ability to connect two independent data sources, this is a particularly useful device in many applications and is an essential component for anyone who needs to switch between two input signals.

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