NXP 74AVC8T245BQ: An 8-Bit Dual-Supply Voltage Level Translator with 3-State Outputs

In modern electronic systems, it is common to find multiple integrated circuits operating at different voltage levels. Efficient and reliable communication between these voltage domains is critical, and this is precisely the role of a dedicated level translator. The NXP 74AVC8T245BQ is a high-performance, 8-bit bidirectional translator designed to bridge these gaps seamlessly, making it an essential component for a vast array of applications from consumer electronics to industrial automation.

This IC is engineered to translate voltage levels between two independent power supply rails (VccA and VccB), which can operate from 1.2 V to 3.6 V. This wide range provides immense design flexibility, allowing the translator to interface between low-voltage processors (e.g., 1.2 V or 1.8 V core logic) and higher-voltage peripherals (e.g., 3.3 V memories or sensors) with ease. The device is fully specified for partial power-down applications using an Ioff circuit, which actively disables the outputs when either VccA or VccB is switched off. This feature prevents any damaging backflow current through the IC during power sequencing, thereby protecting sensitive low-voltage components.

A key feature of the 74AVC8T245BQ is its bidirectional capability. The direction of data flow for all eight bits is controlled by a single Direction Control (DIR) input. A high level on DIR allows data transmission from port A (A1–A8) to port B (B1–B8), while a low level reverses the direction. Furthermore, the device incorporates 3-state outputs, which can be placed in a high-impedance state using the Output Enable (OE) input. When OE is set high, both ports are effectively disconnected, a crucial function for bus-oriented applications where multiple devices share the same data lines.

The translator is optimized for high-speed data transmission. With very low propagation delays and minimal added jitter, it supports high-speed switching and data transfer rates, making it suitable for high-speed serial interfaces like SPI, I2C, and even parallel data buses. Its design also focuses on signal integrity, featuring integrated edge rate control to suppress output overshoot and undershoot, which minimizes ringing on the line.

Housed in a space-saving DHVQFN24 package, the 74AVC8T245BQ is ideal for space-constrained PCB designs. Its robust architecture ensures ESD protection, exceeding industry standards and enhancing the overall reliability of the end product.

ICGOODFIND: The NXP 74AVC8T245BQ stands out as a robust and highly flexible solution for mixed-voltage system design. Its combination of bidirectional translation, wide voltage range, 3-state outputs, and integrated power-off protection makes it an indispensable component for ensuring reliable and glitch-free communication across different voltage domains in modern electronics.

Keywords:

Voltage Level Translation

Bidirectional Translator

3-State Outputs

Dual-Supply

Ioff Circuit