SN65HVD78DRBR

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The SN65HVD78DRBR is a universal level translator from Texas Instruments which provides a cost effective and simple solution for interfacing between digital systems with different voltage levels. Generally, the SN65HVD78DRBR is used for bi-directional level shifting of digital signals between two voltage lines. The device is one of TI’s SN75-series level shifters which make it ideal for interface applications requiring a minimum of two voltage levels and the desired state transitions. It can also be used in point-to-point, multi-point, or full synchronous applications.

Application Field

The SN65HVD78DRBR is commonly used as an interface between two digital systems with different logic levels. This could be between two microcontrollers, one driven by 3.3v and the other by 1.8v. The SN65HVD78DRBR can also be used to drive a wide range of digital circuits from different power sources, such as providing a 5v logic drive from a 1.8v battery. With its low-cost, single channel level translation design, it is also applicable for various applications including bus switching, bus arbitration, SPI, I²C, and other communication protocols.

Working Principle

The SN65HVD78DRBR consists of two voltage transistors and an oscillator in the same IC package. The IC comes with an active low enable pin, EN and two input pins, INA and INB. INA and INB are connected to the two logic supply rails, ground and VCC, respectively. To start the communication between two systems, EN must be activated by pulling it low by a low voltage signal. When EN is held high, no signals are allowed to pass through.

If a signal is applied to INA (say from the 1.8V system), the lesser voltage signal enters into the chip, and then a logic inverting transistor switches it to the higher voltage signal connected at VCC, by converting it to 5V (in this case). The 5V logic level signals are then output at INB and to buffered output pins, OUTB and ~OUTB. Similarly, when a signal is applied to INB, it gets converted to output at INA and to buffered output pins, OUTA and ~OUTA. This simple process is the core mechanism of how the device performs level translation.

The SN65HVD78DRBR is highly efficient, having a wide voltage range support, with low-power consumption, and fast switching. It also has output low-voltage and low-current protection which makes it suitable for use in applications where these factors are important.

The SN65HVD78DRBR is one of the universal level translators from Texas Instruments and provides a reliable, cost effective and simple solution for low voltage applications. Its efficient design, wide voltage range support, fast switching, low power consumption and output low-voltage and low-current protections make it an ideal choice for many interface applications. It is also applicable in point-to-point, multi-point, or full synchronous applications.

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