NXP 74AVCH8T245BQ: An 8-Bit Dual-Supply Voltage Level Translator with 3-State Outputs

In modern electronic systems, it is common for different sub-sections or integrated circuits (ICs) to operate at different voltage levels. Efficient and reliable communication between these voltage domains is critical, and this is precisely the role of a level translator. The NXP 74AVCH8T245BQ is a high-performance, 8-bit bidirectional voltage level translator designed to bridge these gaps seamlessly.

This IC is an 8-bit non-inverting bus transceiver that uses two separate configurable power-supply rails. The VCC(A) port accepts a supply voltage from 1.2 V to 3.6 V, while the VCC(B) port operates from 1.2 V to 3.6 V as well. This dual-supply architecture allows the device to translate voltage levels bidirectionally between any two voltage nodes within these ranges, making it incredibly versatile for interfacing between processors, logic circuits, and peripherals like sensors or memory.

A key feature of the 74AVCH8T245BQ is its 3-state outputs. Each output can be placed in a high-impedance state (Hi-Z), which is essential for preventing bus contention in multi-master or shared bus architectures. This ensures that multiple devices can share the same data lines without interfering with each other when not active.

The direction of data flow is controlled by the direction control (DIR) input. A high level on DIR allows data to pass from the A bus to the B bus, while a low level enables transmission from the B bus to the A bus. Furthermore, the device includes a dual-purpose output enable (OE) pin. When OE is driven low, the outputs are active. When OE is high, all outputs are placed in a high-impedance state, effectively disconnecting the translator from the bus.

Engineers value this translator for its robust design and high-speed operation. It supports live insertion and withdrawal (hot swap) due to its power-off circuitry, which disables the outputs when either VCC is at 0 V. It also features very low static and dynamic power consumption, making it suitable for power-sensitive applications. The device is offered in a DHVQFN24 package, which is ideal for space-constrained PCB designs.

ICGOOODFIND: The NXP 74AVCH8T245BQ stands out as a robust, flexible, and efficient solution for mixed-voltage system design. Its bidirectional capability, 3-state outputs, and wide voltage range support make it an indispensable component for ensuring clear and error-free communication across modern digital systems.

Keywords: Level Translator, Bidirectional, 3-State Outputs, Dual-Supply, Voltage Translation.