Hi,
I have looked at TCA9534 specs and have a question about it.
My design intent is to use the port expander with Vcc at 3.3V with two of the P0-P7 ports would be set as outputs tied to 5V logic circuits and the remaining 6 would be set as outputs tied to 3.3V logic. The I2C_SCL and SDA are communicating with a Master which also operates at 3.3V.
The two ports tied to 5V logic have 10K pull-up resistor to 5V to limit current into the ports.
1. Is it acceptable to use this I2C port expander with this design intent?
2. Can the two 5V logic I/O ports be safely driven Low or High with Vcc at 3.3V?
I would appreciate if any of TI Experts can chime into this question.
Thanks,
Ram.