why does a chip need the power supply of 3.3v and 2.5v

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There are too many power supply in one chip now due to the complication of the chip designed today. Usually, there is not only one core in a complicated chip, so we need different power to run it. For logic circuits, we don't care for the voltage levels if they can work well. as tutx said "For logic level:
logic '0' : from 0 volt to ~30% volt max.
logic '1': from 60% volt max to volt max. "
it depends on the interface that connect with other chips.
 

To see CMOS book and your chip datasheet. U will get it.
 

In general, chip is only pure 2.5V or 3.3V. But sometimes, for system reqirement, we have to design as dual power chip. That is IO is 3.3V and CORE is 2.5V.
 

depends on interfaces of the ASIC, voltages will be provided... say 2.5 v interface for diff signals, 3.3V interface for other ICS,, in general keeping low core voltage (1.2 or 1.8) is to reduce power consumption of the device....so that internal logic consumes less power.
 

3v3 is for IO pad power supply, because chip should be able to communicate

with many existed 3v3 chips.

2V5 is for core logic power supply.





 

3.3v supply for I/O pads
and 2.5v supply for internal core logic.

for pins of the chip, the logic 1 is for 3v+_10%.
for internal cell pin of core, the logic 1 is for 2.5v+_10%.
 

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