SN74ALVTHR16245LR

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The SN74ALVTHR16245LR are high-speed, low-voltage quadruple bus transceivers designed specifically to improve system performance and reduce system power consumption. These devices are designed to incorporate 3.3V and 5V tolerant I/O pins to provide greater flexibility in system designs. The SN74ALVTHR16245LR are designed to transmit and receive four bits of data simultaneously while providing two levels of bus-hold feature. Each of the eight outputs has a 3-state function that allows the output to enter a high impedance state.

The SN74ALVTHR16245LR are organized as two independent 4-bit wide, non-inverting transceivers with flow-through pinout for easy connection between ports. A separate output-enable (OE) signal is used for each side. When an OE signal is asserted, either low or high, all corresponding outputs on matching port will be placed into high impedance state. When both OE signals are disabled, data is transferred from the A port to the B port and from the B port to the A port. This device is designed to be used in asynchronous communication between two buses of two different voltage domains.

The SN74ALVTHR16245LR logic family is typically used as a logic level translation device. They are very useful in applications where both 5V and 3.3V logic levels need to be used, such as interfacing between an older 5V device and a newer 3.3V device. The SN74ALVTHR16245LR are frequently used in applications that require logic level translation, such as in USB 1.1/2.0, PCI-express, and SATA interfaces.

The SN74ALVTHR16245LR are extremely versatile devices classifying them as logic-buffers, drivers, receivers and transceivers. They are used to convert digital information from one type of logic to another. They provide a means of providing buffer, translator and drive capabilities. They are capable of driving multiple loads in either direction or from a single source to multiple destinations.

The SN74ALVTHR16245LR devices are highly integrated and require no external logic to perform data conversion. The devices are also available in different speed grades and power consumption to suit a variety of applications. The low-voltage version (3V) of the SN74ALVTHR16245LR family is designed to operate over the 3V to 3.6V with I/O levels as low as 0.45V and as high as 3.6V. The High-Voltage version (5V) operates over the 5V to 5.5V range with I/O levels as low as 0.45V and as high as 5.5V. The devices feature data rates of up to 75Mbyte/s and robust ESD protection.

The operating principle of the SN74ALVTHR16245LR devices is fairly simple. These devices act as a link between the two buses, one operating at 3.3V and the other operating at 5V. When the data is provided to the input port, the device checks whether the input voltage is compatible with the desired output voltage. If it is compatible, it then translates the logic level from the input logic to the output logic, providing an output signal at the same voltage of the input signal, but with a different logic level. This allows for the data to be transmitted across the two different voltage domains, making it useful in applications where high-speed communication is necessary.

In conclusion, SN74ALVTHR16245LR are versatile logic-buffers, drivers, receivers and transceivers employed in many applications, such as USB and SATA interfaces, due to its high speed, low-voltage operation, and robust ESD protection. Their purpose is to convert digital information from one type of logic to another, allowing for data to be transmitted across a variety of voltage domains. The devices operate by translating the logic level from the input to the desired output level, providing an output signal at the same voltage but with different logic.

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