FSUSB74UMX

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The FSUSB74UMX special purpose analog switch constitutes part of a family of switching ICs manufactured by Fairchild Semiconductor. Compatible with both 3.3 and 5V dual power supplies, it is designed for use as an open drain device in telecommunications, computing and consumer electronics applications.

The Analog switch integrates the logic circuitry of a digital controller and the operating elements of a SPST analog switch into a single package. The unit has a low-level power supply of 1.5V and a maximum on-resistance of 250Ω. The switching voltage range is from 0.5 V to 5V and the switching current is up to 50mA.

The FSUSB74UMX is supplied as an open-drain device and provides a logic low output voltage when an input logic low or output logic high is applied. Its internal transistor gates provide efficient on/off switching of high-frequency analog signals. The maximum bandwidth of the switch is 13 GHz.

The FSUSB74UMX has a built-in low-power open drain buffer, allowing high speed switching at low power. The open drain buffer’s common drain output reduces current consumption significantly, and maintains a steady output voltage level. The device is designed for use in a variety of applications, including audio/visual systems, telecom switching cards, industrial automation, and process control systems.

The input-output structure of the FSUSB74UMX consists of two channels, one output channel (channel 1) and one input channel (channel 2). The common drain output of the open drain buffer is connected to channel one’s output. Channel 1’s output is determined by the combination of logic signals applied to its four digital control inputs, which can either be logic low or logic high. Valid logic low input is 0V and a valid logic high input is +5V.

The output voltage of channel 1 can be controlled to between 0.5V and 5V, depending on the combination of logic inputs applied to its Digital Control Inputs (DCI). The result of the combination of logic inputs is determined by applying a prior-established truth table to the combination of logic inputs.

The design of the FSUSB74UMX optimizes its performance for the applications that require precise analog switching, such as video and audio circuits, where noise immunity and low bit error rate performance are essential. As such, its performance is optimized for use in applications that require precise switching of analog signals, such as Hi-Fi stereo and multi-channel audio systems, audio/visual equipment, communications systems, professional PA systems, and industrials systems.

The FSUSB74UMX is also suited for use in other applications where noise immunity and precise analog switching are not the main priority. The switch can be used in less critical applications such as vehicle and industrial power switching, and similar applications where there is a need for low-cost, reliable switching.

In summary, the FSUSB74UMX is an excellent choice as an analog switch, especially when noise immunity and precise switching is a priority. It is a versatile and reliable unit and is highly suited for use in telecommunications, computing, and consumer electronics applications. Its reliability, low-power consumption, and versatile input/output structure makes it a preferred choice for many applications, including audio/visual, telecom switching cards, industrial, and process control systems.

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