This 250 mA current is the worst case current you will find when there is maximum toggling on the input, I/O pins of the IC.
For frequency - supply current, hence power consumption increases with freq (P = 1/2 * CL * freq *Vdd^2 )
It also varies with Temperature.
If you are interested to get the char data of this device for different frequency and Temperature, we request you to create a case to
Our team will then work to char the device for different frequencies and Temperatures to provide you the required data.
Please let us know if you face any issue while creating the case.
Thanks & Regards,