74FST3251QSR

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The 74FST3251QSR is a signal switch belonging to the families of logic devices that include multiplexers, decoders, and similar logic circuit functions. This chip is a two-channel signal switch, meaning it is capable of switching two data streams, operating in a single-pole double-throw (SPDT) configuration. The device performs a bipolar signal switching between two signal sources with a low on resistance of 30 ohms. The device offers very low leakage current and low capacitance, allowing for a very high degree of signal integrity.

The chip is available in a variety of packages, including a small 4-pin SOT223 surface mount package and a 6-pin DIP. It is supplied in either a TTL or CMOS logic family which provides adequate speed and compatible switching rates for most applications. TTL applications need high speed and excellent performance, while CMOS applications don’t require as much speed but need lower power dissipation.

The 74FST3251QSR is optimized for digital signal processing applications. It is an excellent choice for switching circuits in these designs such as deskewing, shifters, and data multiplexers. It is also ideal for low-speed switching such as in the control of video multiplexers and matrix switching. Other potential applications include RF and microwave applications.

The 74FST3251QSR’s internal construction and working principle is straightforward. The device is constructed on a single silicon substrate with a series of two input pins, two output pins, and a control pin. The two inputs, A and B, each represent one of the two signal inputs. The active low control and enable pin, EN, selects which of the two input signals is routed to the output, Y. EN is either low or high depending on the state of the device and determines the direction of signal flow. If the EN pin is low, the A input will be routed to the Y output and vice-versa if the EN pin is high.

The 74FST3251QSR features a series of internal guards, including protection against static discharge (ESD) and electrostatic protection (EPC) to ensure circuit reliability. The power ratings and loading capabilities of the chip are also significant. The 74FST3251QSR is rated for operation from - 40°C to + 85°C and is rated for an absolute maximum loading of 12mA at 5V.

In conclusion, the 74FST3251QSR is an excellent logic device for signal switching and is suitable for a variety of digital signal processing and RF/microwave applications. With its impressive speed, low switching resistance, low capacitance, and reliable ESD protection, the 74FST3251QSR is an excellent choice for designers looking for an efficient, reliable signal switch in a small package.

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