ONFXMA108BQX
Overview
The FXMA108BQX is a high-performance 8-channel bidirectional voltage level translator featuring auto-direction sensing, eliminating the need for a direction control pin. It supports wide-range translation between 1.65V and 5.5V rails, making it suitable for interfacing legacy 5V logic with modern 1.8V or 3.3V microcontrollers. The device includes power-off protection and non-preferential power-up sequencing, ensuring outputs remain in a high-impedance state until valid VCC levels are reached.
Why Choose This Part
This translator features auto-direction sensing which simplifies PCB routing and reduces MCU pin count by removing the need for a DIR signal. It provides robust protection with outputs that automatically enter a high-impedance state if either VCC supply is grounded, preventing back-drive current. The compact 2.5x4.5mm DQFN package is ideal for space-constrained designs requiring high-density 8-bit translation.
Applications
Key Specifications
Getting Started
When designing with the FXMA108BQX, ensure bypass capacitors are placed as close as possible to both the VCCA and VCCB pins. Since it uses auto-direction sensing, avoid using strong pull-up resistors (lower than 1k ohm) which can interfere with the device's ability to detect signal direction transitions. Ensure the trace lengths on both sides of the translator are minimized to maintain signal integrity at the maximum 100Mbps data rate.
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