This dual bidirectional I2C and SMBus voltage-leveltranslator, with an enable (EN) input, is operational from1.0V to 5.5V VREF1 and 1.8V to 5.5V VREF2.

The RS0302-Q1 allows bidirectional voltage translations between 1.0V and 5V without the use of adirection pin. The low ON-state resistance (RON) of theswitch allows connections to be made with minimalpropagation delay. When EN is HIGH, the translatorswitch is ON, and the SCL1 and SDA1 I/O areconnected to the SCL2 and SDA2 I/O, respectively, allowing bidirectional data flow between ports. WhenEN is LOW, the translator switch is off, and a highimpedance state exists between ports.

In I2C applications, the bus capacitance limit of 400 pFrestricts the number of devices and bus length. Usingthe RS0302-Q1 enables the system designer to isolatetwo halves of a bus; thus, more I2C devices or longertrace length can be accommodated.

The RS0302-Q1 also can be used to run two buses, oneat 400kHz operating frequency and the other at100kHz operating frequency. If the two buses areoperating at different frequencies, the 100kHz busmust be isolated when the 400kHz operation of theother bus is required. If the master is running at 400kHz,the maximum system operating frequency may be lessthan 400kHz because of the delays added by therepeater.

The RS0302-Q1 are available in green VSSOP8 packages. It operates over an ambient temperaturerange of -40°C to 125°C.