For some reason I have to work with CC2400 which is not recommended for new designs. After reading the datasheet, I got two questions concerning the power supply for digital I/O.
1. I'm interfacing CC2400 with a chip that has 2.5V I/O standards, so I'll supply 2.5V on DVDD3.3. The datasheet only provides output voltage of the chip when DVDD3.3=3.3V (section 13, pp.12), then how about 2.5V I/O?
2. What's the current consumption of the digital I/O? In the datasheet (section 5, pp.7) it is not clearly specified (I can guess though).