> I have a I2C master that work with 5.0 volt and a 3.3 volt slave.
> The master is a pic16C84 and the slave is a cmos sensor. I can't use the
> open connector pin RA4 of pic. I use a portB pin.
> How can I resolve the voltage problem?

     The few I2C slaves I have used that require 3.3V actually work fine at
5V. I guess they allow 3.3V operation for lower power usage. Check the specs
of the chip, it might be capable of running at 5V. TTYL