SN74LVC4245APWT

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The SN74LVC4245APWT (LVC4245) is a dual supply bidirectional translator device developed by Texas Instruments. It is part of the 74LVC logic family, a logic family which is specified to the industry-standard low-voltage CMOS (Low Voltage Complementary Metal Oxide Semiconductor) technology. As part of the family, it has the same supply voltage requirements, input and output connection and is designed for low power applications.

The LVC4245 belongs to the Logic - Translators, Level Shifters category, providing bidirectional voltage level translation with two separate power buses. It has an input logic level range from 0.7V to 3.6V and output logic level range from 0.7V to 4.5V. A single VCC voltage is used for the input and output, with an additional VDD voltage is used for the output, allowing the device to interface with different voltage rails. It also has an additional shield pin which when connected to a low voltage level, the output transistors act as open circuits, reducing the power supply current.

The SN74LVC4245APWT is a popular device due to its flexibility in providing voltage level translation between two logic domains with different supply voltage ranges. The device has a typical propagation delay of 4.5ns and a minimum propagation delay of 3.6ns, making it suitable for many applications such as interfacing between TTL logic and high voltage CMOS components, or between FPGA and ASIC logic voltages. Additionally, it can be used to interface between asynchronous logic rails from different data buses, or to provide level shifting from CMOS logic to open collector or open drain logic.

The LVC4245 has a simple internal architecture with 2 PMOS transistors and 2 NMOS transistors circuit. When the voltage at the shield pin is low, the device is off and both transistors are turned off, providing a high input impedance. When the shield pin is high, the device is on, and the logic level from the input is translated to the output.

For example, when interfacing between logic rail of 3.3V to rail of 5V, the 3.3V logic would be connected to the input pin of the LVC4245 and 5V logic would be connected to the output pin. The VCC voltage used for the input is 3.6V and VDD used for the output is 5V. When a logic level of high is applied to the input pin and the shield pin is set to high, a logic level of low will be applied to the output pin, thus creating a voltage level shift of the input signal. Similarly, a logic level of low applied to the input pin and the shield pin set to high will result in a logic level of high applied to the output pin.

This device also works in both directions, which allows for bidirectional communication. A logic level of low or high applied to the output can be translated to the other logic level from the input. When the shield pin is low, the output is disabled and the output transistors act as open circuits reducing the power supply current.

Overall, the SN74LVC4245APWT is a useful device to provide level shifting for many applications. With its ability for bidirectional communication and its ability to handle multiple voltage rails, it makes interfacing between two different logic levels a breeze.

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