Introduction - If you have any usage issues, please Google them yourself
This feature is available only on the SST39VF800Q. This
pin functions as power supply pin for input/output buffers. It
should be tied to VDD(2.7-3.6V) in a 3.0V-only system. It
should be tied to a 5.0V±10 (4.5-5.5V) power supply in a
mixed voltage system environment where flash memory
has to be interfaced with 5V system chips. The VDDQpin is
not offered on the SST39VF800, instead it is a No Connect
pin.