FXWA9306: Dual Bi-Directional I2C-Bus® and SMBus Voltage-Level Translator

The FXWA9306 is a dual, bi-directional, I2C-bus and SMBus, voltage-level translator with an enable (OE) input that is operational from 1.0V to 3.6V (VCCA) and 1.8V to 5.5V (VCCB) without requiring a direction pin.

As with standard I2C-bus systems, the pull-up resistors are required to provide the logic HIGH levels on the translator's bus. The FXWA9306 has a standard open-drain configuration of the I2C bus. The size of these pull-up resistors depends on the system, but each side of the translator must have a pull-up resistor. The device is designed to work with Standard-Mode, Fast-Mode, and Fast Mode Plus I2C-bus devices in addition to SMBus devices. The maximum frequency is dependent on the RC time constant, but generally supports up to 2MHz.

All channels have the same electrical characteristics and there is a minimum deviation from one output to another in voltage or propagation delay. This is a benefit over discrete transistor voltage translation solutions, since the fabrication of the switch is symmetrical. The translator provides excellent ESD protection to lower voltage devices and at the same time protects less-ESD resistant devices.

Features

• 2-Bit Bi-Directional Translator for SDA and SCL Lines in Mixed-Mode I²C-Bus Applications
• Standard-Mode, Fast-Mode, and Fast-Mode-Plus I²C-Bus and SMBus Compatible
• Less than 1.5ns Maximum Propagation Delay to Accommodate Standard-Mode and Fast-Mode I2C-Bus Devices and Multiple Masters
• Allows Voltage Level Translation Between:
• 1.0V V_CCA and 1.8V, 2.5V, 3.3V, or 5V V_CCB
• 1.2V V_CCA and 1.8V, 2.5V, 3.3V, or 5V V_CCB
• 1.8V V_CCA and 3.3V or 5V V_CCB
• 2.5V V_CCA and 5V V_CCB
• 3.3V V_CCA and 5V V_CCB
• Supports I²C Clock Stretching and Multi-Master
• Provides Bi-Directional Voltage Translation without Direction Pin
• Low 3.5Ω On-State Connection Between Input and Output Ports; Provides Less Signal Distortion
• Open-Drain I²C-Bus I/O Ports (A0, A1, B0, and B1)
• 5V-Tolerant I²C-Bus I/O Ports to Support Mixed-Mode Signal Operation
• High-Impedance A0, A1, B0, and B1 Pins for OE = LOW
• Lock-Up-Free Operation
• Flow-Through Pinout for Simpler Printed-Circuit Board Trace Routing
• Packaged in 8-Terminal Leadless MicroPak™ (1.6mm x 1.6mm)
• ESD Protection Exceeds:
• 4kV HBM ESD (per JESD22-A114)
• 8kV HBM ESD (Pin to Pin, B Port)
• 1KV CDM (per JESD22-C101)